Welcome at SFB837


Events   News
  1. 21.09.2016: Workshop: Verschleiss von Abbauwerkzeugen im maschinellen Tunnelbau: Analyse des Tribosystems Lockergestein aus geologischer und werkstofftechnischer Sicht @ Ruhr University, Bochum
  2. 29.07.2016: Modeling fluid-infiltrating, partially-frozen and quasi-brittle porous media with nonlocal discrete-continuum techniques @ Ruhr University, Bochum
  3. 08.07.2016: Consistent Implementation of FEM Solutions for the Theory of Porous Media @ Ruhr University, Bochum
  4. 24.06.2016: Centrifuge Model Tests and Numerical Analyses on Shallow Tunnels in Unsaturated Ground @ Ruhr University, Bochum
Guest Lectures
 
  1. SFB 837 Brochure 2016
  2. 7th International Workshop on Reliable Engineering Computing (REC 2016)
  3. Reconstruction Rastatt DB tunnel - SFB 837 cooperates within BIM pilot project
  4. Girlsday 2016
  5. Faculty organizes pen house in cooperation with the SFB 837

Workshop: Verschleiss von Abbauwerkzeugen im maschinellen Tunnelbau: Analyse des Tribosystems Lockergestein aus geologischer und werkstofftechnischer Sicht
21.09.2016 - 09:30
at: Ruhr University, Bochum

Im Fokus der Veranstaltung “Verschleiß von Abbauwerkzeugen im maschinellen Tunnelbau: Analyse des Tribosystems Lockergestein aus geologischer und werkstofftechnischer Sicht”, die am 21. September 2016 stattfindet, steht der Erfahrungsaustausch zwischen Industrie und Forschung bezüglich der Verschleißthematik im maschinellen Tunnelbau:

Auf welche Probleme treffen Werkzeughersteller und Baufirmen in der Realität und wie können bzw. werden diese aktuell gelöst.

Wie können wir in Kooperation Untersuchungen und Ergebnisse generieren, die direkt im Tunnelbau Anwendung finden.

Ein detailliertes Programm und alle weiteren Informationen finden Sie im Flyer.

Die Teilnahme am Workshop ist kostenlos.





see Flyer for further details

 


Modeling fluid-infiltrating, partially-frozen and quasi-brittle porous media with nonlocal discrete-continuum techniques
29.07.2016 - 10:00
at: Ruhr University, Bochum

Prof. Steve WaiChing Sun from Columbia University, The Fu Foundation School of Engineering and Applied Science, USA will hold a guest lecture in the framework of SFB 837 about 'Modeling fluid-infiltrating, partially-frozen and quasi-brittle porous media with nonlocal discrete-continuum techniques'.

Many engineering applications, such as geological disposal of nuclear waste, require reliable predictions on how porous media responds to extreme environments. This presentation will discuss the relevant modeling techniques designed specific for porous media subjected to such harsh environments.

In particular, this talk will provide an overview of:

  • a finite strain finite element model that captures the freeze-thaw action of frozen soil,

  • the variational eigen-fracture techniques used to model brittle fracture and compaction bands,

  • the usage of multiscale techniques to link grain-scale simulations to macroscopic predictions and hence bypass the usage of any macroscopic phenomenological law.




see Flyer for further details

 


Consistent Implementation of FEM Solutions for the Theory of Porous Media
08.07.2016 - 14:00
at: Ruhr University, Bochum

Dr. Dorival M. Pedroso from University of Queensland, School of Civil Engineering, Australia will hold a guest lecture in the framework of SFB 837 about 'Consistent Implementation of FEM Solutions for
the Theory of Porous Media'.

The Theory of Porous Media (TPM) is a rational and convenient mathematical framework to represent the macroscopic behaviour of porous media including interactions between multiple constituents.

The resulting system of equations is usually known as the hydro-mechanical problem and seldom possesses analytical solutions with few exceptions; however many successful applications take advantage of numerical solutions based on the finite element method (FEM).

A way to update primary and state variables in the FEM is to use implicit schemes that are unconditionally stable. These schemes nonetheless require a number of (consistent) derivatives for achieving (quadratic) convergence when using Newton’s method. Furthermore, all state variables must be initialised with consistent initial conditions. Therefore, overall consistency of the numerical solver must be followed in order to obtain accurate results under feasible computing times.

An additional challenge during the solution of the multiconstituent flow problem in porous media is the treatment of unilateral boundary conditions that arise when liquid may escape from the porous domain through a region prone to changes in saturation. These kind of boundary conditions greatly increase the difficulty especially in coupled simulations and hence require a proper method to treat them.

This presentation aims to clarify the aforementioned challenges and to suggest a couple of algorithms that were published in to their solution. Focus will be given to:

  • the innovation around the derivation of all consistent operators and correct setting up of initial conditions;

  • new method to handle unilateral boundary conditions;

  • the concept of references and a hysteretic liquid retention model derived from it;

  • computer implementation aspects and the convenient use of the Go language to develop a general purpose FE solver with parallel computing capabilities (Gofem).




see Flyer for further details

 


SFB 837 Brochure 2016



The latest SFB 837 Brochure 2016 can be downloaded here. It will give an overview of the SFB team and the research topics.

English brochure 2016

 


Centrifuge Model Tests and Numerical Analyses on Shallow Tunnels in Unsaturated Ground
24.06.2016 - 13:00
at: Ruhr University, Bochum

Attention: Time has been changed!

Prof. Dr.-Ing. Wei Wu from University of Natural Resources & Life Sciences, Austria will hold a guest lecture in the framework of SFB 837 about 'Centrifuge Model Tests and Numerical Analyses on Shallow Tunnels in Unsaturated Ground'.

The face stability of shallow tunnels in partially saturated soil is investigated by means of centrifuge testing and numerical analysis. A silty soil is used in these studies. Some model tests were carried out with a geotechnical centrifuge by varying soil densities and the ground water table. FE analyses with a constitutive model were performed for partially saturated soil. In this presentation, the numerical results will be compared with the centrifuge test results.



see Flyer for further details

 


Numerical Investigation of Hydro-Mechanical Coupling in Fractured Porous Media, Creep and Cracking of Rocks
21.06.2016 - 16:00
at: Ruhr University, Bochum IC 03/604

Prof. Ahmad Pouya from Laboratoire Navier, Ecole des Ponts Paris Tech, France will hold a guest lecture in the framework of SFB 837 about 'Numerical Investigation of Hydro-Mechanical Coupling in Fractured Porous Media, Creep and Cracking of Rocks'.

Hydromechanical coupling in cracked or fractured porous media is at the basis of desiccation cracking in soils and concrete, hydraulic fracturing in petroleum applications and fault activation in reservoir formations due to fluid injection. Numerical modelling of these phenomena faces different difficulties both for the hydraulic and mechanical aspects. The mass balance equation for fluid exchange between fractures and the porous matrix was recently extended to multi-fractured porous media and the weak formulation of the flow problem allowed building an efficient Finite Element method for flow in these media. Also cohesive zone models have allowed a great progress for modelling fracture propagation by taking into account non linearities like plasticity and creep. More sophisticated formulations of these models allow modelling propagation under normal, shear or mixed loading modes. Another difficulty, which has impeded the used of FEM for multi-fractured materials, was the difficulty for mesh generation in domains containing a high number of cracks. Recent developments make possible the use of FEM to the case of fractured or cracked media. Based on these progresses, numerical methods have been developed and applied to the analysis of a variety of problems like hydraulic fracturing in reservoir formation, shrinkage cracking in soils and cyclic fatigue and viscous cracking in polycrystalline materials like salt rock. Some examples of these numerical modellings will be given in this presentation.



see Flyer for further details

 


7th International Workshop on Reliable Engineering Computing (REC 2016)



The 7th International Workshop on Reliable Engineering Computing (REC 2016) with the topic "Computing with Polymorphic Uncertain Data" will be held in the Convention Center of Ruhr University Bochum, June 15 - 17, 2016, see http://rec2016.rub.de for further details.

The conference REC 2016 is an interdisciplinary event with contributions especially from Civil and Mechanical Engineering, Mathematics and Computer Science. The meeting will be held the first time in Germany this year and is organized by the Institute of Structural Mechanics in cooperation with Prof. Rafi Muhanna (Georgia Institute of Technology, USA) und Prof. Robert Mullen (University of South Carolina, USA).

The workshop topic "Computing with Polymorphic Uncertain Data" is focused on computational approaches taking aleatoric and epistemic uncertainties into account. Stochastic and non-stochastic approaches will be presented and also combinations of diverse uncertainty models will be discussed.

Workshop program

 


Reconstruction Rastatt DB tunnel - SFB 837 cooperates within BIM pilot project



On 25th May 2016 Alexander Dobrindt, minister of transport and digital infrastructure, inaugurated the construction site for the new Rastatt tunnel. On the basis of a cooperation with the SFB 837, Building Information Modeling (BIM), i.e. the comprehensive modeling of the entire construction process, was first applied by the Ministry of Transport and Digital Infrastructure. The goal is to make precise predictions on expected settings and potential risks for the surface development.
On this occasion, Minister Dobrindt emphasized the significance of digital planning technologies and hence the cooperation with the SFB. According to Dobrindt, the "leap to digital planning and building 4.0" could be taken on the basis of this BIM pioneering project. The construction site hence became "an intelligent data cloud – with a new quality of data, close connections between all involved parties, a higher transparency and efficiency as well as real time project controlling." This would help to reduce risks and to implement building projects in a "better, faster and cheaper" manner.
The Rastatt tunnel has a length of 4.2 km. It is part of the new rail way track Karlsruhe-Basel (Rheintalbahn), for which two single-way high speed tubes are built. The federal government has been investing 450 million euros in the project. The tunnel is reconstructed with the aim of reducing travel times and the noise load for the neighboring areas. The tunnel is to be finished in 2022.

Further information can be obtained here

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Higher Order Finite Elements for the Simulation of Ultrasonic Waves for Structural Health Monitoring
10.05.2016 - 16:00
at: Ruhr University, Bochum

Prof. Dr.-Ing. Ulrich Gabbert from Otto-von-Guericke-University Magdeburg, Germany will hold a guest lecture in the framework of SFB 837 about 'Higher order finite elements for the simulation of ultrasonic waves for structural health monitoring'.

Ultrasonic waves offer a great potential for structural health monitoring (SHM) in many applications. At distinguished discontinuities high frequency waves are transmitted, reflected and mode conversions may also occur, which can be used to identify even small structural failures and damages. For a suitable design and analysis of SHM systems the finite method (FEM) is commonly applied. Due to the required increasing number of elements per wave length for increasing frequencies, the application of standard finite elements is limited due to the computational costs.
In the presentation it is shown that for wave analysis higher order finite elements with non-uniform ansatz spaces are much more efficient with respect to computational costs and accuracy than standard lower order finite elements available in commercial FEM software tools.
Even more complex finite element models are required if traveling waves in heterogeneous materials have to be investigated.
In the presentation it is shown, that a higher order finite cell approach is of great advantage for such materials, because the mesh has not to be body fitted. A regular cubic or tetrahedral mesh is sufficient. The real structure is taken into account only during the integration of the finite element/cell matrices. It is also possible to use a microstructure available from CT measurements. The accuracy of the cell approach is shown for different wave propagation examples.



see Flyer for further details

 


Girlsday 2016



Like in the past few years this spring too, the so-called "Girls Day" took place at universities throughout Germany. Ruhr-University also participated in the event, opening its doors to female pupils between 14 and 16 years of age. The goal was to give them an impression of study programs and research institutions in which women are traditionally a minority. In more than 30 natural-scientific workshops participants gained insights into engineering practice and had the chance to prove their practical skills. Several departments of the Faculty of Civil and Environmental Engineering Sciences along with their SFB 837 sub projects also contributed to the Girls Day. Illustrating some specific aspects from the areas of tunneling and foundation engineering it was shown how interesting and exciting the work of an engineer can actually be.

Various presentations and workshops on topics such as "Concrete is colorful" (BSc. Frederik Buckenhüskes, Prof. Dr.-Ing. R. Breitenbücher / Department of Building Material Techniques in cooperation with the M.Sc. Jasmin Tkocz, Department of Structural Engineering - Prof. Dr.-Ing. P. Mark), "Hocus Pocus with Sand and Clay" (M.Sc. Raoul Hölter, / Department of Foundation Engineering, Soil and Rock Mechanics - Prof. Dr. Ing. Schanz /) and "Structural Mechanics: How can Buildings be Calculatedć" / Dr. Ing. Steffen Freitag, M.Sc. Katharina Kremer, Institute for Structural Mechanics - Prof. Dr. tech. Meschke) aroused the participants' interest for tunneling-related issues and inspired a new generation of scientists.


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On adaptive polygonal finite elements: An application to collapse plastic analysis
26.04.2016 - 16:00
at: Ruhr University, Bochum IC 03/604

Prof. Hung Nguyen Xuan from HUTECH University, Vietnam will hold a guest lecture in the framework of SFB 837 about 'On adaptive polygonal finite elements: An application to collapse plastic analysis'.

Polygons occur extensively in nature. Polygonal finite elements have been applied to a wide range of mechanics problems. They offer more flexibility in mesh design for arbitrary geometries. However, adaptive polygonal finite elements have not been found sufficiently in the literature and furthermore in collapse plastic analysis of solids.

The present research contributes into four crucial points: 1) a spatial decomposition structure obtained from a so-called polytree mesh scheme; 2) Wachspress shape functions at vertex and bubble nodes handled at a primal-mesh level; 3) plastic strain rates and dissipation performed over a dual-mesh level; and 4) a new adaptive primal-mesh strategy driven by the L²-norm-based indicator of strain rates. Investigating both purely cohesive and cohesive-frictional materials. It is proved numerically that the present method performs well for volumetric locking problem. In addition, the optimization formulation of limit analysis is written by the form of second-order cone programming (SOCP) in order to exploit the high efficiency of interior-point solvers. The present method retains a low number of optimization variables and allows us to design and solve the large-scale optimization problems effectively.


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Guest lecture – Dr. Burton Lee The View from Silicon Valley : Internet-of-Things, Industry4.0 and the Future of Engineering Sciences
15.04.2016 - 10:00
at: Ruhr University, RUB, IC 03/604

In cooperation with Faculty for Civil and Environmental Engineering Dr. Burton Lee will hold a guest Lecture on "The View from Silicon Valley : Internet-of-Things, Industry4.0 and the Future of Engineering Sciences"

Guests are sincerely welcome.


Retrospect

This past Friday PhD MBA Burton Lee gave a guest lecture in which he introduced the audience to the mindset of the most important location of the IT and high-tech industry, the Silicon Valley. "What is currently hot in Silicon Valley" was the focus of his speech, and he approached the topic from various points of view, including terms such as "Internet-Of-Things" "Industry 4.0" and "The Future of Engineering". He also focused throughout his guest lecture on the differences between Europe and the USA, regarding e.g. start-ups and financing. Having studied as a young man in Germany, Burton Lee is familiar with both mentalities and was hence able to illustrate his points with anecdotes from his time in many countries and companies. From his personal experience he encouraged his audience to always follow their interests and desires. Staying abroad, if at all possible outside of Europe, as well as being interested in a broad range of areas is to him quintessential in order to get a good job.



see Flyer for further details

 


RD SME Workshop „Subsurface Modeling and Engineering“
07.04.2016 - 10:00
at: Ruhr University, Bochum

On April 7th the RD-SME Workshop „Subsurface Modeling and Engineering“ will take place.
The workshop starts with two invited presentation:

"Background and status of the In-situ Stimulation and Circulation Experiment"
Dr. Florian Amann (ETH Zürich Switzerland)

"Numerical Methods in Geoenergy Applications"
Prof. Dr. Olaf Kolditz (Helmholtz Centre for Environmental Research GmbH, Germany)

Afterwards an overview on three existing collaborative research centers within the RD-SME will be given.

Link to Webpage


see Flyer for further details

 


Faculty organizes pen house in cooperation with the SFB 837



On 17th March 2016 interested pupils visited the RUB at the annual open house to find out about its variety of study programs.

After the welcome speech of the Head of the Dean's Office, Dr. Ulrike Schulte, the pupils joined the comprehensive program offered by the chairs of the Department of Civil and Environmental Engineering. A number of guided tours provided insights into the working rooms such as the concrete labs of SFB 837, or the lab for infrastructure and environmental engineering. Furthermore, they had the chance to ask questions on what it's like to study civil engineering, got insights into the fields of research of the SFB 837 and whatever aspects came into their minds. Tutors, members of the student council und doctoral candidates of the SFB 837 explained how the courses are structured and gave their perspective on possible job fields of Civil and Environmental Engineering graduates.




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Zwischenstatusseminar 2016






 


Overview of Subsurface Geosciences at Berkeley Lab with Focus on Nuclear Waste Disposal
15.02.2016 - 09:00
at: Ruhr University, Bochum

Dr. J.T. Birkholzer from Lawrence Berkeley National Laboratory, USA will hold a guest lecture in the framework of SFB 837 about 'Overview of Subsurface Geosciences at Berkeley Lab with Focus on Nuclear Waste Disposal '.

This presentation will provide an overview of cross-cutting subsurface energy research conducted at Berkeley Lab. Subsurface energy resources (primarily hydrocarbons but also geothermal energy) currently provide or enable more than 80% of U.S. primary energy, and the trend of relying on the subsurface to meet U.S. energy needs is expected to increase. The subsurface is also a vast reservoir that can be used for the transient storage of energy and for the permanent disposal of energy waste streams (such as CO₂ and nuclear waste). However, the complexity and difficulty involved in characterizing subsurface reservoirs hinder our ability to utilize the full potential of these systems, and thus to deliver critical subsurface energy solutions. Berkeley Lab is at the forefront of tackling the scientific and technical challenges to managing and optimizing subsurface utilization while minimizing environmental impacts. This requires integration across a wide range of interdisciplinary expertise, including multiphase flow, reactive geochemistry, imaging of the subsurface, and geomechanics.

A particular focus of the presentation will be on Berkeley Lab’s research related to nuclear waste disposal. After being a key contributor to the research and licensing activities for the proposed Yucca Mountain repository, Berkeley Lab is now conducting research and technology development to enable long-term disposal of used nuclear fuel and wastes in alternative host-rock environments (e.g., shale, salt rock, crystalline rock). Examples of research foci include the near-field rock damage and potential transport pathways induced by repository construction and waste emplacement, the impact of such damage on radionuclide transport in different components of engineered barrier, and long-term performance assessment studies on the suitability of alternative repository locations and designs. Advanced methods for monitoring and simulating relevant coupled processes are tested against data from large in situ experiments conducted in subsurface field observatories.

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SFB 837-member Dr.-Ing. Jelena Ninic awarded ZERNA Prize 2015

at: Bochum

On Friday, 21st November 2015, the Official Graduation Ceremony of the Faculty of Civil and Environmental Engineering took place. On this occasion, Dr.-Ing. Jelena Ninic, former research assistant at the RUB department of Structural Mechanics and member of the SFB 837 was awarded the 'ZERNA Prize' for the outstanding quality of her PhD thesis.
'Zerna Planen and Prüfen GmbH' is a long-established engineering company the founder of which, Prof. Professor Emeritus Dr.-Ing. habil. Dr.-Ing. E.h. mult. Wolfgang Zerna, significantly shaped the profile of the RUB between the 1960s and 1980s. He was the first professor to take over the Civil Engineering department in 1967. At the same time, he intensified his practical activities as an engineering consultant, as a test engineer, and as an author of scientific engineering publications. The Zerna Prize has hence a long tradition at the Faculty of Civil and Environmental Engineering and carries a high amount of prestige.



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Review Workshop: Exploring Different Doctoral Training Setups and Identifying Potential Cooperation Schemes between 02.-03. November 2015

at: Bochum

As part of the German-South Africa Cooperation in Higher Education, a BMBF-Funded Workshop on the topic "Exploring Different Doctoral Training Setups and Identifying Potential Cooperation Schemes" was hosted by RUB- Research School on 2nd and 3rd November 2015. Opening speeches were given by the RUB Rector Prof. Dr. Axel Schölmerich and Thomas Böhm, a representative from the German Rector's Conference.
The workshop served to illustrate PhD training approaches in Germany, using the example of the SFB 837 Integrated Graduate School (MGK). Furthermore, it discussed the SA concept and explored potentials for further cooperation. The following organizations participated in the workshop: The National Research Fundation (SA), the SA Department of Science and Technology, the RUB- Research School (RURS), DFG, GK iGRAD-Plant (Heinrich Heine Universität Düsseldorf), International Graduate School of Science and Engineering (TU München) and of course, SFB 837 (RUB).


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Joint Workshop "Recent Advances In Tunneling" hosted by IKC Cambridge in cooperation with Tongji University, University of Graz, University of Leoben and SFB 837 Ruhr University Bochum on occasion of the International Conference EUROCK 2015, October 07-10.

at: Salzburg, Austria

Since 2011, the SFB 837 has been maintaining close cooperations with the IKC Cambridge, UK and Tongji University Shanghai with a focus on the topic "Recent Advances in Tunneling“.
Bi- and trilateral PhD-workshops were organized in Cambridge (2011), Shanghai (2012) and Bochum (2013). In 2014, when a meeting took place for the fourth time, this time at Shanghai, the group was extended for University of Graz and University of Leoben, both members of the organization "ACTUE" (Austria China Research in Tunneling and Underground Engineering).



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SFB 837 Schoolarship program 2015 – Internship B.Sc. Ishaan Rajankar, National Institute of Technology in Surathka, India

at: Bochum

Mr. Rajankar, undergraduate student from the National Institute of Technology in Surathka, India, was SFB 837 scholarship holder for a three-month period from June to August 2015 at the Institute of Tunneling under the direction of Prof. Dr.-Ing. Markus Thewes, supervised by Mrs. Alena Conrads, M.Sc. The purpose of his Internship was a deeper introduction into the field of mechanized tunneling with the focus on separation plants and process simulation. Therefore, a simulation model of a separation plant was successful realized with the software AnyLogic®.

 


SFB-Short-Term Scholarships at Ruhr-University Bochum - Second Call

at: Bochum

The Collaborative Research Center SFB 837 invites applications for



  • Short-term scholarships for international (non-German) guest researchers (Ph.D. researchers & PostDocs) performing research in areas closely related to the SFB 837. The scholarship enables awardees to conduct a research visit of up to three months at institutes related to the SFB 837 at Ruhr University Bochum.

  • Fast-Track scholarships ("Bachelor to Ph.D.") in "Computational Engineering". The scholarship is restricted to M.Sc. candidates with a "Bachelor of Honors" Degree (or equivalent). It provides financial support for the first year of a "Fast-Track" version of the Master degree program "Computational Engineering" at Ruhr University Bochum.

  • Short-term scholarships for Ph.D. candidates. The scholarship supports the initial phase (up to one year) of a Ph.D. to be performed in one of the research areas of the SFB 837. Prerequisites are an excellent M.Sc. degree and a specific research proposal related to one of the research fields of the SFB 837.



see Flyer for further details

 


Workshop Herausforderung Tunnelbau
06.11.2015 - 15:00
at: Ruhr University, Bochum

The use of subsurface structures is one of the key factors in the sustainable development of both industrial and emerging/developing nations. Subsurface transalpine traffic routes, the tendency towards larger diameters, difficult geological conditions and high groundwater pressures pose new challenges to tunneling and excavation technologies.

This year's workshop will feature the following presentations (held in German):

"Tunnel Rastatt - Herausforderungen für den maschinellen Tunnelbau und für modernes Building Information Management"
Dipl.-Ing. Thomas Grundhoff, Dipl.-Ing. Sascha Klar, ABS/NBS Karlsruhe-Basel - Projekt Tunnel Rastatt, DB Netz AG, Karlsruhe

"2. S-Bahn Stammstrecke in München - Herausforderungen für den Tunnelbau im schwierigen Umfeld von Bestandsbauwerken in der Innenstadt"
Dipl.-Ing. Albert Schneller, Großprojekt 2. S-Bahn-Stammstrecke München, DB Netz AG, München

  Participation is free of charge




see Flyer for further details



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Reliability analysis of Geotechnical Systems&apos
12.10.2015 - 17:00
at: Ruhr University, Bochum IC 03/604

Prof. G. L. Sivakumar Babu from Indian Institute of Science, India will hold a guest lecture in the framework of SFB 837 about 'Reliability analysis of Geotechnical Systems'.

The properties of natural soil are inherently variable and influence design decisionsin geotechnical engineering. Apart from the inherent variability of the soil, the variability may arise due to measurement of soil properties in the field or laboratory tests and model errors. These wide ranges of variability in soil are expressed in terms of mean, variance and autocorrelation function using probability/reliability based models. The most common term used in reliability based design is the reliability index, which is a probabilistic measure of assurance of performance of structure. The main objective of the reliability based design is to quantify probability of failure/reliability of a geotechnical system considering variability in the design parameters and associated safety. The presentation highlights the importance of reliability based design methodologies of different geotechnical systems such as shallow foundations, pile foundations,retaining walls, unsaturated slopes, piping in dams as well as pavements, municipal solid waste landfills. A number of techniques and concepts such as random fields, inverse reliability based optimization; response surface methods, time dependent reliability etc have been used to bring out the significance of consideration of variability in soil parameters in the design and analysis of geotechnical systems.

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Download: SFB 837 Brochure



The latest SFB 837 Brochures can be downloaded here. They will give an overview of the SFB team and the research topics.

English brochure 2015

German brochure 2014

 


Analysis of Slurry (Mix shield) TBM Ground Deformation Control during the Queens bored tunnels project in New York City
16.09.2015 - 16:00
at: Ruhr University, Bochum IC 03/604

Prof. Mike Mooney from Colorado School of Mines, USA will hold a guest lecture in the framework of SFB 837 about 'Analysis of Slurry (Mix shield) TBM Ground Deformation Control during the Queens bored tunnels project in New York City'.

The first part of the presentation will give an overview of the Colorado School of Mines. A summary of the research projects currently being conducted is also included.

The second part of the presentation will focus on recent research into slurry TBM control of ground deformation observed on the Queens bored tunnel project in New York City.
Four closely spaced and near surface transit tun-nels were excavated using two me-chanically identical Herrenknecht mix shield TBMs. The talk will describe the Queens bored tunnels and obser-ved deformation, present the observed TBM behaviors and the results of com-putational modeling.


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PROF. MESCHKE HAS BEEN APPOINTED TO THE AUSTRIAN SCIENCE BOARD
16.09.2015 - 15:59


The Council of Ministers of the Austrian Federal Government has decided to appoint Prof. Dr. Günther Meschke, Head of the Institute for Structural Mechanics at Ruhr University Bochum, to be a member of the Austrian Science Board as of 01.01.2016 for six years.

According to the press release of the Austrian Science Board, "Prof. Günther Meschke, as an excellent exponent of modern engineering sciences, enjoys high international reputation. He is an expert for scientific policy, especially for comparing the situation in Austria with other countries."

At the turn of the year 2015/2016, the Austrian Science Board will be faced with far-reaching changes. At that time, the term of the current prominent chairmanship will end, which is very active concerning governmental policy on higher education. After the decision of the Austrian Council of Ministers July 7, 2015, the Austrian Science Board is pleased to announce, that the characteristics of his advisory activity, i.e. independence and scientific substantiality, will be guaranteed also in the future due to the appointment of excellent successors.

The new members of the Austrian Science Board, which have been suggested and nominated by the Austrian Council of Ministers, fulfill all mandatory requirements: high scientific reputation, political independence, long-term experience in science and matters concerning the universities and scientific policy, reliable readiness to contribute to the working groups of the Austrian Science Board.

The Austrian Science Board advises both the Federal Minister and the universities, as well as advising the National Assembly and the regional assemblies about matters concerning the universities and generally on special questions of scientific policy and the arts. Taking into consideration European and international developments, the Science Board observes and analyses the Austrian university system and as well as the related academic systems and prepares recommendations for their further development.

 


Summer School on Risk

at: Vienna

Members of the SFB 837 have attended the joint SFB-GRK-WRS Summer School on Risk at Vienna University of Technology from 16. – 22.08.2015. The summer school has been hosted by the “Vienna Doctoral Programme on Water Resource Systems” (WRS) and organized in cooperation with the Research Training Group (GRK 1462) “Evaluation of Coupled Numerical and Experimental Partial Models in Structural Engineering” from Bauhaus University Weimar and the Collaborative Research Center (SFB 837) “Interaction Modeling in Mechanized Tunneling” from Ruhr University Bochum.

 


The round thing in the square thing: Civil Engineering football match on 15th July 2015



On 15th July 2015 the annual football match hosted by the Civil Engineering student council was held on the synthetic turf behind the GB building. The teams - made up of students and lecturers of the faculty - all put up a good fight, even despite the high temperatures and the sultry weather conditions. The team that represented the SFB 837 didn't make it to one of the first three places, but was only narrowly defeated by the rivaling teams that mainly consisted of Civil Engineering and Computational Engineering students. With free drinks and free grilled sausages everyone was finally rewarded - winners and losers, players and viewers.


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23rd International Conference on Multiple Criteria Decision Making MCDM 2015 - Bridging Disciplines

at: Hamburg

SFB 837 will organize a special session at 23rd International Conference on Multiple Criteria Decision Making MCDM 2015 - Bridging Disciplines in Hamburg, Germany, August 2nd-7th, 2015

 


Highly-Scalable Methods for Computational Fluid Dynamics Simulation
07.07.2015 - 16:00
at: Ruhr University, Bochum

Prof. Riccardo Rossi from International Center for Numerical Methods in Engineering (CIMNE), Barcelona will hold a guest lecture in the framework of SFB 837 about "Highly-Scalable Methods for Computational Fluid Dynamics Simulation".

The simulation of engineering problems in CFD and other disciplines requires handling increasingly complex geometries. This in turn puts an increasing burden on all the aspects of a simulation pipeline, from the pre processing to the solution stage.

The use of “Immersed CFD” techniques represents an appealing alternative in addressing such scenario, providing a completely automatic path toward the solution of complex CFD problems.

A cornerstone of such technique is the capability of efficiently running extremely large problems, since the use of fine meshes is mandatory both in capturing the geometrical features of interest and in providing the required accuracy.

The focus of the talk will be thus on highly scalable solver technologies for CFD, with special emphasis on the use of modern HPC hardware. The talk will include a brief discussion of deflation approaches to scalable sparse preconditioning as well as the discussion of real world benchmark examples.

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Status Seminar 2015

at: Burg Schnellenberg




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From Tunnel Vision to Visions of a Tunnel

at: Blue Square

The perspective from the biomechanical processes that cause the eye disease "glaucoma" to the physical soil conditions that are important in tunneling was drawn up in the presentation "Virtual Tunnel Vision: From Numerical Eye Models to Simulations in Tunneling" on 2nd April 2015 at BlueSquare in Bochum's city center. The presentation was given by Prof. Dr. tech. Meschke, head of the RUB department of statics and dynamics and coordinator of the DFG-funded Collaborative Research Center 837 on the topic "Interaction Modeling in Mechanized Tunneling", which was established in 2010. He was assisted by Dr.-Ing. Britta Schößer from the RUB department of tunneling and construction management (Prof. Dr.-Ing. Thewes) and herself involved in the SFB 837 as a leader in the sub project A6 (transient penetration processes of bentonite suspensions into cohesionless soft soils).

The presentation merged selected results of the SFB837 and numerical multiscale models of the human eye to show up today's possibilities of advanced computer-aided simulations.
The presentation was a part of the presentation series "ING für ALLE", an experimental and multimedia format for young and old. The series explores the complex engineering processes that paved the way for common items and arrangements that shape our everyday life. The presentations each take place on every first Thursday in the month. They are organized by ALLES ING!, a joint initiative of the three RUB engineering faculties. It's goal is to give the engineering sciences a more modern outlook and make them more popular among the public.

Further information:



Image gallery

 


Modelling of anisotropy, creep and destructuration in clay
28.04.2015 - 16:30
at: Ruhr University, Bochum

Prof. Gustav Grimstad from Norwegian University of Science and Technology will hold a guest lecture in the framework of SFB 837 about "Modelling of anisotropy, creep and destructuration in clay".

Natural soft soils exhibit bonding between particles. During straining, some of these bonds can be progressively destroyed by a process called "destructuration". In recent years, a number of constitutive models incorporating bonding and destructuration have been proposed. The various models differ in the precise form of the destructuration law and in the form of the underlying reference model used for the "unbounded" material. A model for soft clay, including rate dependency by utilizing the time resistance concept, is presented. The model is primarily meant for soft clays and the calibration of the model is performed with focus on the "wet" side. However, the conceptual basis can be applied to higher degree of over-consolidation which will produce similar results as high strain rates will for "normal-consolidated" clay. More details on the model can be found in e.g. Grimstad and Degago (2010).
Recently NTNU has been administrating an EU project called "Creep of Geomaterials", www.ntnu.edu/creep. The aim of the project is partly to get to a consensus on creep modelling in the engineering practice. The reasonable modelling of creep deformation in the soft clays in e.g. Norway and Sweden for engineering practice is important to ensure a good design that reduces e.g. maintenance costs or ensures the integrity of the construction. The presentation will also touch upon the work that has been done in the "CREEP" project.



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Numerical simulation of a progressive slide mechanism in a sensitive clay. The Smaaroed case from Sweeden December 2006
28.04.2015 - 16:00
at: Ruhr University, Bochum

Prof. Steinar Nordal from Norwegian University of Science and Technology will hold a guest lecture in the framework of SFB 837 about „Numerical Simulation of a Progressive Slide Mechanism in a Sensitive Clay - The Smaaroed Case from Sweeden December 2006„.

The lecture introduces porepressure based strength softening, as observed in Scandinavian soft, sensitive clays. The softening implies that, strictly speaking, a conventional limit equilibrium based slope stability analysis is not appropriate for a highly sensitive clay. A slide may develop in a progressive manner, passing peak strength at different times along a potential, long sliding surface. A traditional limit state based design may provide a safety factor larger than one for a slope that actually will fail.
The progressive failure mechanism is believed to play an important role for the quick clay slide that took place in Smaaroed in Sweden in December 2006. An investigation committee concluded that the slide was triggered by the construction of an embankment overloading the upper part of the slope. The slide then progressively developed 200 meter downslope. The constitutive model „NGI_ADPsoft„ is used in a finite element simulation order to incorporate the anisotropic strain hardening/softening behavior of the sensitive clay. A regularization method is implemented in order to remediate mesh dependency. The method involves non-local strains controlling the shear band thickness through an internal length. The FEM analysis of the Smaaroed slide is presented and demonstrates how local failure first develop under the embankment before the failure mechanism is then seen to gradually progress downslope, finally covering the area that actually failed in 2006. The results shed light on a discussion, currently going on in Norway, on how much safety factors must be increased to account for the effect of softening in a practical design if traditional limit equilibrium analysis is used for calculating the slope stability.



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Methodology for Real-Time Adaptation of Tunnels Support using the Observational Method
31.03.2015 - 16:00
at: Ruhr University, Bochum

Prof. Daniel Dias from Polytech Grenoble, France will hold a guest lecture in the framework of SFB 837 about “Methodology for Real-Time Adaptation of Tunnels Support using the Observational Method”.

The observational method in tunnel engineering allows the evaluation in real time of the actual conditions of the ground and to take measures if its behavior deviates considerably from predictions.

However, it lacks a consistent and structured methodology to use the monitoring data to adapt the support system in real time. The definition of limit criteria above which adaptation is required are not defined and complex inverse analysis procedures may be needed to consistently analyze the problem.
A methodology for the real time adaptation of the support systems during tunneling will be presented. In a first step, limit criteria for displacements and stresses will be proposed. The methodology uses graphics that are constructed during the project stage based on parametric calculations to assist in the process and when these graphics are not available, since it is not possible to predict every possible scenario, inverse analysis calculations are carried out. The methodology will be applied to the “Bois de Peu” tunnel which is composed by two tubes with over 500 m long.

It will be showed that the methodology has potential to be applied in real cases contributing for a consistent approach of a real timeadaptation of the support system and highlight the importance of the existence of good quality and specific monitoring data to improve the inverse analysis procedure.



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Changed Location!!!
Doctoral Defense: Computational strategies for predictions of soil-structure interactions during mechanized tunneling
31.03.2015 - 13:00
at: Ruhr University, Bochum

On March 31st Dipl.-Ing. Jelena Ninić will give a defense of her doctoral dissertation "Computational strategies for predictions of soil-structure interactions during mechanized tunneling".

Mechanized tunneling is a well-established construction technology that allows for tunnel advances in a wide range of geological environments, high ground water pressures or small cover depths as often met in urban tunneling. During the design and construction of shield-driven tunnels, a reliable prognosis of the tunneling-induced effects as well as constant process control and real-time countermeasures are required to enable safe construction and to prevent failures. To this end, computational strategies for the holistic prognosis of soil-structure interaction effects caused by mechanized tunneling in the design phase as well as in real time during the tunnel construction are proposed:
In the first part, the components of a process-oriented finite element model for the simulation of the shield tunneling process in partially saturated soil are presented. The model is applied for the evaluation of effects and interactions induced by the mechanized tunneling process. The second part presents an embedded beam formulation for discretization-independent FE analyses of interactions between pile foundations and the surrounding soil. The proposed formulation allows consideration of piles and pile groups with arbitrary orientation, independently from the discretization of the surrounding soil. In the third part, a method for simulation-based steering of the mechanized tunneling process in real time during the construction is proposed. To this end, meta models are used to substitute computationally expensive finite element simulations. The proposed simulation-based model update and computational steering procedure is demonstrated with the example of real project data of the metro Wehrhahn-Line in Düsseldorf.



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Introduction of X-Earth Center and Its Application of Rock Mechanics
03.03.2015 - 16:00
at: Ruhr University, Bochum

Prof. Akira Sato from Kumamoto University, Japan will hold a guest lecture in the framework of SFB 837 about "Introduction of X-Earth Center and Its Application of Rock Mechanics".


Geo-mechanics group including rock and soil mechanics group of Kumamoto University are organizing research group "X-Earth Center". The organization introduced industrial and μ-focus X-ray CT scanner systems, and has been operating and applying the systems to the Geo-mechanics field. At the beginning of the presentation, X-Earth Center and its activities are introduced.

Main research field of Prof. Sato is the rock mechanics, and also applying CT system to the analysis of water flow, water saturation process, CO² migration process, diffusion phenomena in the porous media and so on. Results of these analyses are mainly introduced in the presentation. He also studies DEM analysis to understand the blockage phenomena in the vertical shaft of open pit mines and water-vapor flow simulation by finite volume method are also studied. Outlines of these research topics are also introduced.



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Guest Lecture: Damage in pressurized interfaces of hydrocarbon wells
17.02.2015 - 16:00
at: Ruhr University, Bochum

Prof Carlo Callari from University of Molise, Italy will hold a guest lecture in the framework of SFB 837 about "Damage in pressurized interfaces of hydrocarbon wells".


In oil/gas wells, circumferential cracks are often observed at the two contacts of cement sheath with the casing and the rock, respectively. The corresponding formation of an annular gap at these interfaces (the so-called "micro-annulus") can be the main reason for upward leakage of fluids. In sites of CO2 storage or shale gas production, such a leakage can be an environmental issue of major concern, especially in presence of several abandoned wells. The upward propagation of debonding at well interfaces is often driven by the same fluid pressure, thus indicating the crucial role of the coupling between fluid flow and mechanical damage in the problem at hand. In view of these considerations, we present an interface poroelastic law to model fluid-induced damage. The new model is obtained from a penalized thermodynamic potential for porous interfaces, defined in terms of displacement jump and fluid pressure, and employing generalized poroelastic coefficients which depend on a damage internal variable. The coupled laws for traction and fluid content obtained from this potential are fully consistent with arguments using surface fractions and partial stresses. The rate of energy release resulting from differentiation of the interface potential with respect to damage is realistically dependent on fluid pressure. The considered damage criterion and the corresponding evolution law employ an available expression of damage resistance for dry interfaces. We assess the model ability in reproducing the main behavioural features of fluid-pressurized fractures in concrete. Furthermore, the proposed poroelastic damage model is contrasted with other laws for pressurized interfaces. The model is implemented in a formulation of the problem consisting of a well with displacement discontinuities and fluid pressures at interfaces. The semi-numerical solution of this problem is employed to simulate the effects on well integrity due to the combined action of fluid pressure, cement shrinkage, temperature variations and rock strain.



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PROJECT EMSAT WINS EUREKA INNOVATION AWARD

at: Bochum

On Nov, 19th 2014 the project EMSAT (Enhanced Monitoring and Simulation Assisted Tunneling) won the EUREKA-Award in the category "Innovator of Tomorrow"

In the project EMSAT, Ruhr University Bochum, the Austrian company Geodata and Montanuniversity Leoben have developed an integrated tunnel monitoring, simulation and information system.

It consists of three interlinked modules:

1. EMSAT-cut: a realtime measurement system consisting of sensors and devices used to monitor the individual forces acting on excavation tools of a tunnel boring machine.

2. EMSAT-sim: a processing system consisting of computer hard- and software components used to calculate finite-element tunnel simulations rapidly and automatically.

3. EMSAT-inf: an information system used for management, visualization and analysis of tunneling data and for connecting all EMSAT-modules.

EMSAT provides continuous prognoses (e.g. of the expected ground deformation) right during tunnel excavation. The prognoses are based on input data that are live-recorded on site and transferred directly from the tunnel boring machine to a remote data processing center via the Internet. Offered as a webservice, EMSAT helps avoiding tunneling risks such as collapses or critical deformation.

Newspaper article






© SIF 2014

 


SFB-Short-term Scholarships at Ruhr-University Bochum



The Collaborative Research Center SFB 837 invites applications for



  • Short-term scholarships for international (non-German) guest researchers (Ph.D. researchers & PostDocs) performing research in areas closely related to the SFB 837. The scholarship enables awardees to conduct a research visit of up to three months at institutes related to the SFB 837 at Ruhr University Bochum.

  • Fast-Track scholarships ("Bachelor to Ph.D.") in "Computational Engineering". The scholarship is restricted to M.Sc. candidates with a "Bachelor of Honors" Degree (or equivalent). It provides financial support for the first year of a "Fast-Track" version of the Master degree program "Computational Engineering" at Ruhr University Bochum.

  • Short-term scholarships for Ph.D. candidates. The scholarship supports the initial phase (up to one year) of a Ph.D. to be performed in one of the research areas of the SFB 837. Prerequisites are an excellent M.Sc. degree and a specific research proposal related to one of the research fields of the SFB 837.



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RUB Visiting International Professor Grant

at: Bochum

RUBs Research School decided to award a Visiting International Professor Grant of 12.000€ to Prof. Dr. Callari.
This Research School PLUS funding can be used for Prof. Callaris visits to RUB

 


On the Interaction between a Tunnel Boring Machine and the Surrounding Soil
02.12.2014 - 16:00
at: Ruhr University, Bochum IC 03/606

The presentation gives a brief overview of my PhD research. This research project investigated the mechanical equilibrium of a Tunnel Boring Machine (TBM) driving in soft soil and the interaction between the TBM-shield and the soil, where primarily monitoring data is used to model the physical processes induced by the TBM advance. The monitoring data used is obtained from the Hubertus tunnel in The Hague, Netherlands.

A kinematic model of shield behaviour is introduced that captures the displacement history of the soil induced by the advancing shield. The calculated displacements are processed into stresses acting on the shield by means of a purpose-built bedding model. Limitations and advantages of the newly proposed bedding curves are discussed.

Stresses, forces and moments acting on the TBM are combined to verify its mechanical equilibrium. The conditions where a static equilibrium is or is not achieved are discussed. As a result, a quantitative assessment of the influence of the tail-void grouting is made.

The interface displacements calculated by the model and those actually measured into the soil are compared. Where correlation is weak alternative explanations are proposed, including the penetration of pressurized grout mortar into the interspace between the TBM-shield and the excavated geometry. It is shown that the pattern of the induced displacements substantially differs from that assumed by the volume-loss scheme.



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The Spaghetti bridges - or what do civil engineers doć

at: Bochum

We use several infrastructures like streets, tunnels, and bridges every day on our way to school or work. Only once these are damaged and do not work properly anymore do we notice that we need them urgently.
Just: how do you build a bridgeć And: do all bridges look the sameć
Together we take a look at how loads are being carried and which constructions are necessary for this. You can construct bridges by yourself and can test how much weight they can withstand. As examples you should collect several pictures and drawings of bridges in advance and bring them along to the event.

Seminar

Konzept







 


Herausforderung Tunnelbau
14.11.2014 - 15:00
at: Ruhr University, Bochum

The use of subsurface structures is one of the key factors in the sustainable development of both industrial and emerging/developing nations. Subsurface transalpine traffic routes, the tendency towards larger diameters, difficult geological conditions and high groundwater pressures pose new challenges to tunneling and excavation technologies.

In his presentation Prof. Anagnostou will dicuss the stability of the tunnel face on the basis of the latest scientific findings. The presentation of Dipl.-Ing. Heinz Ehrbar gives insights in the construction of the Gotthard Base Tunnel and suggests conclusions for future large-scale tunneling projects.






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Eurostars Project EMSAT in finals for EUREKA-Award



The Cooperation Project Eurostars / EMSAT between Geodata in Austria and the Institute for Structural Mechanics has been selected as one of the three finalists in the category "Innovators of Tomorrow".

EUREKA's Eurostars Programme is the first European funding and support programme to be specifically dedicated to research-performing SMEs.

 


SFB 837 meets the Japan Society of Civil Engineers
24.10.2014 - 13:00
at: Ruhr University Bochum

The digital design of infrastructures is currently a big topic, not only in Germany. Japan researchers and construction companies are also working on new approaches to digitial design and construction. To learn about the current state of digital design of infrastructures in Germany, a delegation from the Japanese Society of Civil Engineers visited the Ruhr-Universität in Bochum on October 24, 2014 (see picture). On the one hand, industrial insight was given by HOCHTIEF ViCon GmbH and ceapoint aec technologies GmbH, which presented fundamental working practices and completed projects. On the other hand, current research results of the Collaborative Research Center SFB 837 within the area of holistic data management and interaction modeling for mechanized tunneling were discussed. This meeting has revealed that the efficient design and construction of large infrastructure projects are still a big challenge, and that the key to success is the use of methods specifically developed for the digital design and construction of industrial structures, known as Building Information Modeling.




 


Aspects of Optimal Experimental Design
21.10.2014 - 16:00
at: Ruhr University, Bochum

The utilisation of mathematical models to gain a deeper understanding of complex (technical) systems is common practice in various research fields. In addition to the proper choice of a suitable model structure the parameter identification step is crucial in modelling. The determination of unknown model parameters by minimising the difference between simulation results and measurement data may result in imprecise parameter estimates, θ. A proper quantification of these parameter uncertainties, however, is a challenging issue but a prerequisite for Optimal Experimental Design (OED). OED aims to provide credible parameter estimates by evaluating additional experimental runs, which are designed in an optimal way.

In this lecture the essential step of uncertainty quantification and propagation is addressed. It is shown how the so-called Point Estimate Method (PEM) provides a reasonable compromise of accuracy and computational load. Hence, after a short recall of the uncertainty quantification basics the merits of PEM are demonstrated by illustrative examples. Additionally, the direct link between parameter sensitivities and OED is presented. Here, too, the determination of global parameter sensitivities benefits from the efficiency of PEM. Some comments to the software tools used for implementation complete the presentation.



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Minisymposium "Computational Modelling in Underground Construction"

at: IACMAG, Kyoto, Japan

In the framework of SFB837 Prof. G. Meschke (RUB, SFB837), Prof. K. Soga
(Cambridge University, UK) und Prof. Y. Yuan (Tongji University, China) will organize a minisymposium "Computational Modelling in Underground Construction" at 14th IACMAG Conference,
September 22-25, 2014 in Kyoto, Japan

 


Evaluation of oil contamination in porous media by X-ray CT image analysis and LBM simulation
17.09.2014 - 10:00
at: Ruhr University, Bochum

Mechanism of oil contamination in a porous media is complex due to flowing because some oil should be flushed by water movement or some oil should be trapped. These mechanics is caused by the capillary force and it should be exerted by three items: pore diameter, pore shape and connectivity. Hence, it has a great influence to the oil flow. Nowadays, μ-focus X-ray CT can evaluate first two items applying adapt image processing. Besides, the clarification to flow dynamics will require mechanical properties and indentation velocity of fluid with viscosity ratio between the fluids, the interaction force, and wetting properties such as contact angle.

Lattice Boltzmann Method (LBM) may be relatively easy to introduce the boundary conditions for the boundary complexity. In addition, LBM has the high adaptability to a two-phase flow issue, so the research results by for instance, two-phase flow in porous material such as soil materials can be calculated including the movement of the fluid interface between two phases for the oil - water. The purpose of this study is to elucidate the mechanism of water-oil flow in porous materials. Therefore LBM simulation was implemented using by pore structural data that is extracted from CT image. In this presentation, authors simulate capillary behavior of a light non-aqueous phase liquid (LNAPL) with different capillary number (Ca) and then, trapped LNAPL will be simulated by water injecting after LNAPL distributed in the glass beads. In this presentation, LBM simulation to artificial image with regular arrangements and to X-ray CT image of glass beads would be conducted and their results are discussed.






Presentation slides






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guest lecture: Compressibility of Porous Materials, Thermodynamics, and the Total Differential
16.09.2014 - 16:00
at: Ruhr University Bochum IC 03/606

Typical experiments performed on saturated soils (swelling and non-swelling porous materials) include the drained, jacketed, and pseudo-bulk compressibility experiments. In this talk we show how to use thermodynamics to develop the relationship between these compressibilities and the compressibility of each phase and the void fractions. The mathematical tool used is one commonly used in physical chemistry, but has not been used consistently in hydrology and geomechanics: the total differential. The results of the thermodynamical analysis (with no constitutive assumptions) are presented for a saturated porous material with possibly both phases compressible, and the theory is compared with Biot's, Zimmerman's, and Gassmann's formulation. Also we examine the results of Brown and Korringa. Because minimal assumptions are made the results are applicable to developing a framework for deriving a Terzaghi result and potential consequences for wave propagation.



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SFB 837 Summer School: Experiment and Simulation
01.09.2014 - 10:00
at: Ruhr University, Bochum

In den Verbundforschungsvorhaben SFB 837, GRK 1462 und WRS finden sowohl experimentell als auch numerisch orientierte Vorgehensweisen zur Erforschung der vielfältigen Wechselwirkungen beim maschinellen Tunnelbau, zur Bewertung gekoppelter numerischer Partialmodelle im Konstruktiven Ingenieurbau und zur Erforschung komplexer Wasser-Ressourcen-Systeme Anwendung. Labor- bzw. in-situ Experimente liefern Erkenntnisse zur Beschreibung physikalischer Phänomene und werden zur Validierung numerischer Modelle und zur Identifikation der entsprechenden Modellparameter benötigt. Die Summer School "Experiment and Simulation" fokussiert auf die gezielte Kombination Experimenteller und numerischer Untersuchungen zur Erforschung des Material-, Struktur- und Systemverhaltens.



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Minisymposium Computer aided steering in engineering" 11TH WORLD CONGRESS ON COMPUTATIONAL MECHANICS

at: WCCM2014, Barcelona

In the framework of SFB837 Dr. S. Freitag (SFB 837), Prof. D. Hartmann, Prof. G. Meschke und Dr. Stascheit (Maidl Tunnel Consult) will organize a mini symposium "Computer Aided Steering in Engineering" at 1th World Congress on Computational Mechanics
(WCCM2014) Conference in Barcelona, Spain.

Link to Webpage

 


Status Seminar 2014

at: Burg Schnellenberg





Image gallery

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Minisymposium Polymorphic Space- and Time-Dependent Uncertainty Modelling in Engineering

at: ASCE-ICVRAM-ISUMA 2014, Liverpool, UK

In the framework of SFB837 will participate in minisymposium "Polymorphic Space- and Time-Dependent Uncertainty Modelling in Engineering" at 2nd International Conference on Vulnerability and Risk Analysis and Management and
6th International Symposium on Uncertainty Modelling and Analysis (ASCE-ICVRAM-ISUMA 2014), Liverpool,
UK

Link to Webpage

 


Performance analysis of TBM's by using analytical cutting models and geostatistics
10.07.2014 - 14:00
at: Ruhr University, Bochum IC 04/408

In mechanized tunneling using TBM's the contact of the cutting tools with the rock (or soil) precedes every other work like mucking and support. Penetration into the cohesive/frictional porous solid by the tip of a disc cutter or cutting pick of a TBM, can be achieved only a fraction of a cm at a time. Analysis of the cutting processes in rocks and soils give precious information on rock mechanical properties e.g. strength, deformability and abrasivity (backward problem). The forward problem is the optimum design of cutting tools, i.e. picks, discs, then of the cutting head and operational parameters. In order to achieve both aims the logical step is to study first the mechanics of a single cutter penetrating and cutting the geomaterial and then compose the whole response model of the cutting head. Analytical models of cutting tools for Geomaterials based on Elasticity Theory, Limit Theory of Perfect Plasticity and Linear Elastic Fracture Mechanics are presented.

Before the outset of the excavation of a TBM several geotechnical and geological data are collected along the tunnel "corridor". This data should be interpolated along the planned tunnel axis on a 3D grid of the geological model. Geostatistical theory accompanied with CAD tools provide the mathematical/geometry frame needed for the estimation of spatially or temporally correlated data from sparse spatial sample data. Then it is possible to correlate the TBM performance with the geological-geotechnical conditions at regular intervals along the tunnel. Herein, we are going to display the above concepts and tools with two example case studies, one referring to the double tube tunnel DB320 project (part of the KCRC West Rail Project in Hong-Kong) and another pertaining to a 1,800 m section of the metro line extension in Athens.



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Informationssysteme im Tunnelbau
08.07.2014 - 12:00
at: Ruhr University , Bochum

Für die sichere Abwicklung von komplexen Infrastrukturprojekten ist die kontinuierliche Aufzeichnung, Auswertung und Verarbeitung der anfallenden Daten zur Projektsteuerung nötig, um den Projektfortschritt und die Kostenentwicklung zu dokumentieren. Die Bewältigung dieser Datenflut entwickelt sich bei Großprojekten zu einer der Hauptaufgaben des Managements. Web-basierte, modular aufgebaute und daher frei konfigurierbare Softwarelösungen wie IRIS.tunnel bieten die Möglichkeit, die zuvor größtenteils isoliert betriebenen Datenauswertungen wie bspw. das Dokumentenmanagement, Management von Planungs- und Abrechnungsdaten sowie Erfassung und Verarbeitung von Maschinen- und Sensordaten in einer zusammenführenden Plattform zu bündeln. Der Vortrag beschreibt Aufbau und Funktionsweise eines solchen Informationssystems und gibt Hinweise für die Anwendung.






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DFG agrees on continued funding of the SFB 837 Interaction Modeling in Mechanized Tunneling

at: Bochum

The German Research Foundation (DFG) has been funding the Collaborative Research Center "SFB 837" since July 1st 2010. The SFB 837 is comprised of researchers from the Faculty of Civil and Environmental Engineering, Mechanical Engineering and Geo Sciences. In a DFG senate meeting on May 15th, 2014, the SFB 837 was unanimously recommended for continued funding for four more years. According to DFG, such a unanimous decision is etraordinarily rare, and hence the involved parties are all the more proud of such a positive appraisal.
The focus of the Collaborative Research Center SFB 837 "Interaction modelling in mechanized tunneling" is the research and development of Computer aided models, methods and design concepts, that, with the support of experimental studies and empirical data, can accurately predict and model the numerous complex interactions of the components (ground, shield machine, support measures, tunnel lining, existing buildings) and processes (advancing and excavation process, construction operation) involved in mechanized tunneling. To this end, the goal of the SFB 837 is to supplement pre-existing empirical approaches used in design and monitoring of the mechanized tunneling process, with reliable and accurate numerical models in order to enable more efficient, low risk and environmentally friendly solutions in the design and construction of shield supported tunnels.
Proceeding from the findings and developments of the first funding period, the research program for the second period (1 July 2014 to 30 June 2018) will encompass further associated research topics. Among these are two new sub-projects, which are specifically dedicated to the exploration of bentonite-soil-interactions in hydro shield machines and to tool-soil interaction.
The SFB 837 currently employs 25 PhD candidates, 27 research assistants and 4 technical employees. It also features an integrated graduate school and maintains close relations to renowned universities worldwide (e.g. University of Cambridge, Tongji University).







PR-Announcement

 


Moderne rheologische Messungen zum besseren Verständnis des Fließverhaltens von Bohrspülungen - vergleichende Betrachtung herkömmlicher und neuer innovativer Messverfahren

at: Ruhr University Bochum, Bochum

"Moderne rheologische Messungen zum besseren Verständnis des Fließverhaltens von Bohrspülungen - vergleichende Betrachtung herkömmlicher und neuer innovativer Messverfahren" is a Workshop which will be presented by Mrs. Dr. H. Strauß and Mrs. Dipl.-Chem. A. Schulz on 04th June.



image gallery









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Joint Workshop "Recent advances in Tunneling and Underground Space Research" in the framework of the International Conference GeoShanghai 2014, May 26th - 28th between IKC Cambridge, Tongji Univerity Shanghai and Ruhr University Bochum

at: GeoShanghai2014, Shanghai, China

The SFB 837 has established a continuous collaboration "Recent advances in Tunneling and Underground Space Research" with the IKC Cambridge, UK and Tongji Univerity Shanghai, China in 2011 and 2012.
Bi- and trilateral PhD. workshops were organized in Cambridge (2011) and Shanghai (2012) and Bochum (2013)

In 2014, the joint workshop will be integrated within GeoShanghai 2014 Conference on a special session. This upcoming workshop groups from "ACTUE" Austria China Research in Tunneling and Underground Engineering.



Link to Webpage


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Wave Propagation in Partially Saturated Soils
16.05.2014 - 14:00
at: Ruhr University Bochum, IC 03/653

"Wave Propagation in Partially Saturated Soils" is a lecture which will be presented by Mrs. Dr.-Ing. B. Albers.

If the pores of a porous medium are filled by two (or more) immiscible fluids, as for example, water and air, then they are called "partially saturated". The pore fluids possess different partial pressures, i.e. there exists a discontinuity in the pressure across the interface separating them. This difference is called capillary pressure. It depends on the geometry of the pore space, on the nature of the solids and and on the degree of saturation, i.e. the ratio of the volume occupied by one of the pore fluids over the entire pore volume.
In the lecture some aspects of the phenomenology and of the mechanical properties of such media are addressed. The modelling of three-component media will be described. A linear macroscopic model is introduced whose material parameters have to be determined from their measurable microscopic counterparts. The focus of the talk lies on the propagation of sound waves in partially saturated soils. The wave propagation analysis predicts the existence of four sound waves in partially saturated porous media - one transversal wave, S, and three compressional waves, P1, P2 and P3. Their acoustic properties are shown in dependence on frequency and degree of saturation. The P1-wave is mainly driven by the skeleton. At a high degree of saturation its speed increases up to the double of the value for other saturations. This phenomenon may be used for the development of nondestructive testing methods, e.g. to warn against landslides. The P2-wave shows a similar behavior to the sound wave in suspensions: its speed has a deep minimum in dependence on the saturation. The P3-wave only exists if at least two immiscible pore fluids occur. Its speed is attributed to the capillary pressure between the pore fluids.


See the image Gallery



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SFB 837 Workshop on Communication and Conflict Management by Dr. Ulrike Hanskötter, Research Engineer and Communication Trainer at Airbus, GER
09.05.2014 - 14:00
at: Ruhr University Bochum, IC 03 / 653

What does communication have to do with yogać Not the least, one would usually say. In her workshop on "Communication - A View from a Research Engineer Working in an International Industrial Company" Dr. Ulrike Hanskötter, research engineer and communication trainer at Airbus, proved the opposite, however: Dysfunctional conversations and even conflicts can be overcome and avoided by means of so-called "non-violent communication, a concept which goes back to American psychologist Marshall Rosenberg. NVC is useful for resolving conflicts, connecting with others, and living in a way that is conscious, present, and attuned to one's genuine and living needs. This corresponds to the teachings of yoga according to which a higher state of mind can be achieved by a high degree of self-awareness. Yoga allows individuals to come together energetically to a place of connection and timelessness, free from the bonds of ego-connection. In this sphere, communication can even do entirely words and misunderstandings just won't occur.

In this context, Dr. Hanskötter extended her views on the concept of Dragon Dreaming, a method that is based on chaos and system theory, strategies of community building, project management and the knowledge of the Aborigines. It relies on creativeness, transparency, teamplay and cooperation and aims at unfolding the potential of all involved parties to identify and realize a common goal.

Even though these were two highly unusual approaches for the SFB audience, who, as engineers, are used to think in strictly logical terms, Dr. Hanskötter's explanations fell on fertile ground and were a true inspiration to many of them. See the pictures to get an impression of that interesting and unconventional afternoon.


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Interaktionsmodelle für die Trassenplanung von Tunnelbauwerken
08.05.2014 - 08:30
at: Ruhr University Bochum, RUB, IC 04 / 206

"Interaktionsmodelle für die Trassenplanung von Tunnelbauwerken" is a workshop which will be organized by the reseach group DFG 1546 - 3D Tracks and the SFB 837 - Interaction Modeling Mechanized Tunneling.

Prof. M. Breuning, Prof. A. Bormann, Prof. S. Hinz, Prof. T. Kolbe and Prof. E. Rank as well as some Members of the SFB 837 will give lectures on May, 8th.


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Data Assimilation for Geotechnical Applications
31.03.2014 - 13:30
at: Ruhr University, Bochum

In the framework of SFB 837 Prof. Akira Murakami from Kyoto University Japan will hold a guest lecture with the topic of "Data Assimilation for Geotechnical Applications"

This presentation includes a computational method, incorporating the finite element model into data assimilation using the particle filter, is presented for iden- tifying material properties based on sequential measurements under the known changing traction boundary conditions in order to overcome some difficulties in identifying the parameters for elasto-plastic problems from which the existing inverse analysis strategies have suffered. A soil-water coupled problem, which uses the elasto-plastic constitutive model, is dealt with as the geotechnical application.



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Applications of the Particle Filter to some practical Problems in Geotechnical Engineering
31.03.2014 - 13:30
at: Ruhr University, Bochum

In the framework of SFB 837 Prof. Takayuki Shuku from Okayama University Japan will hold a guest lecture with the topic of "Applications of the Particle Filter to some practical problems in geotechnical engineering"

This presentation includes two application examples of the particle filter (PF) to practical problems in geotechnical engineering. In the first example, deformation behavior of Kobe Airport island constructed on a reclaimed land were analyzed by using a soil-water coupled finite element method with a elasto-plastic constitutive model called Cam-clay model, and the elasto-plastic parameters of the model were identified by the PF. Second example focuses on the consolidation behavior of clay foundation improved by a vacuum consolidation method which is a typical remedial measure for long-term settlement of clay foundation. Identified parameters by the PF were applied to future predictions for deformation behavior of foundation grounds, and the practicability of the PF was discussed by comparing prediction results with the corresponding observation data. Apart from the inverse analyses, our latest topics regarding a particle method (Moving Particle Semiimplicit method, MPS) are also demonstrated in the presentation.



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Multi Tasking Business Men and Women
19.02.2014 - 13:00
at: Ruhr University Bochum, Bochum

Beruflich etwas bewegen, mit Spaß forschen und lehren, Privatleben und Hobbies haben, Eltern sein. Sie wollen in allen Bereichen Ihres Lebens richtig gut sein. Geht diesć

Mit dieser Fragestellung beschäftigt sich das Seminar "Multi Tasking Business Men and Women" von Frau Susanne Westphal.

Das Seminar findet in deutscher Sprache statt.

Anmeldeschluss ist der 21.01.2014.



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Soil Variability and its Consequences in Geotechnical Engineering
26.11.2013 - 13:00
at: Ruhr University Bochum

The core competences of civil engineers are designing, building and maintaining structures and buildings to enable life and business for society. This includes the prevention against natural hazards such as climatological, hydrological, meteorological and geophysical disasters. Such complex hazards ask for sophisticated techniques to ensure appropriate safety standards for society. Too low safety standards can result in many casualties and much economic damage, whereas too high standards results in overly expansive systems. Therefore, these phenomena ask for sophisticated methods to consider their impacts on structures. Especially geotechnical engineers are asked for integrated concepts to design structures withstanding the above mentioned hazards.

This presentation will focus on the evaluation of the effects of soil variability within the framework of probabilistic methods. The evaluation of stochastic soil properties including spatially correlated soil properties is deeply investigate on a theoretical basis. These results are used in case studies on the evaluation of the spatial correlation of different measurement data sets. These outcomes are also used in different case studies, which are focusing on the effects of soil variability for typical geotechnical problems.



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Best Paper Award
08.11.2013 - 12:00
at: Ruhr University Bochum

The paper entitled "A Refined Product Model for Shield Tunnels Based on a Generalized Approach for Alignment Representation", which had been prepared in collaboration with the TU Munich, won the Best Paper Award at the 1st International Conference on Civil and Building Engineering Informatics (ICCBEI) in Tokyo. The authors are Julian Amann(1), Andre Borrmann(1), Felix Hegemann(2), Javier R. Jubierre(1), Matthias Flurl(1), Christian Koch(2), Markus König(2) (1:Technische Universität München, 2:Ruhr-Universität Bochum)

 


Workshop mechanized and conventional tunneling
30.09.2013 - 08:00
at: Ruhr University Bochum












On the 30th of September a group of young researchers and professionals from the Institutes for Subsurface Engineering (Leoben, Austria) as well as Tunnelling and Construction Management (Bochum, Germany) are teaming up with fellow engineers from the Herrenknecht AG (Schwanau, Germany) for a workshop on the research activities and new findings regarding mechanized and conventional tunneling. From foam conditioning on EPB-machines to clogging effects at the cutting faces, from new methods for the numerical simulation of the cutting process of hardrock-disks to state-of-the-art monitoring of TBMs and their cutting tools, the researchers will touch a broad variety of topics. Most presentations will refer to ongoing doctorates work. The workshop will be supported by the collaborative research department "Interaction modeling in mechanized tunneling " (SFB 837) of RUB and is open for interested researchers. For more information on the workshop and its location as well as the registration please contact Dr. Götz Vollmann (0234/3226104; goetz.vollmann@rub.de).


The detailed program of the workshop can be found here.





 


SFB 837 discussed on LinkedIn



Mr. Tobias Rahm was asked to present his research within the subproject C3 of SFB 837 to a professional audience at the AnyLogic Conference 2013 in Berlin. Mr. Rahm is developing a process-oriented simulation model for mechanized tunneling. A central aspect of his work is the combination of two simulation paradigms in one model to simulate the related processes in detail. This hybrid approach made an impression on the professional audience. Furthermore, he demonstrated in an interesting way how the simulation software AnyLogic can be applied in construction industry.


Mr. Rahm was the only academic speaker in this conference. The presentation of each speaker was filmed an uploaded to Youtube. The talk of Mr. Rahm can be accessed in full length at: YOUTUBE. Furthermore, the presentation attracts attention on LinkedIn where it is discussed among the users of this social network: LinkedIn Login.


In the field of simulation software, AnyLogic (by XJ Technologies) is by now one of the leading solutions. It is applied by well-known companies such as Infineon, Strabag, Volvo, Thales or Fraport. But also governmental institution, e.g. NASA or the German Aerospace Center, are among the users. The AnyLogic Conference was established to present the whole spectrum of possible applications. It took place right after the world-famous Winter Simulation Conference 2013. The full article of "Simulation of the Construction of a Tunnel with a Tunnel Boring Machine" can be found on: AnyLogic .

 


WHL-Workshop - SFB meets Landeshauptstadt Düsseldorf
02.09.2013 - 07:00


On Monday, September 2nd, 2013 the Collaborative Research Center 837 "Interaction Modeling in mechanized Tunneling" welcomed a delegation from the state capital city Düsseldorf and the engineering consultants Grassl. During the half-day workshop, researchers of the subprojects A4, A5, C1, D1 and D3 presented the status quo of an interactive product model of the tunneling project "Wehrhahn-Linie" in Düsseldorf. The researchers have compiled available (measurement) data from the whole tunneling process in Düsseldorf, converted them in a common data format and organized the data in an interactive product model. Currently, a web-service is being integrated to couple numerical simulations on the basis of an interaction platform.

In the Virtual Reality Lab (VR-Lab) at the Department of Civil and Environmental Engineering (Chair of Computing in Engineering), all participants had the chance to try the interaction platform in a 3D visualization environment. One special highlight for the guests from Düsseldorf was the interactive animation of the shield tunneling machine in connection with settlements measured by the TerraSAR-X satellite. "It's a very impressive experience to take a walk through Düsseldorf and see the animated colored settlement dots", said Andrea Blome, Head of Traffic Department at the state capital city Düsseldorf. At the end of the workshop Prof. Mark gratefully acknowledged the technical and financial support from the authorities of Düsseldorf which allowed this valuable project to be accomplished.




From left to right: T. Barciaga, M. Galli, Dr. Labbert, M. Grassl, A. Blome, E. Ziem, H. Neuß, Prof. Mark, F. Hegemann, S. Schindler, Dr. Lehner, Dr. Koch, A. Alsahly, A. Vonthron

 


Summer School on "Risk and Uncertainty"

at: Bauhaus-University Weimar:

In August 2013 SFB 837 contributed to the International Summer School on the topic "Risk & Uncertainty" at Bauhaus-University Weimar. The Summer School is a series of academic programmes organised annually in rotation with the following three Phd Research Groups: DFG GRK 1462 "Model Qualities" (Bauhaus-Universität Weimar), DFG SFB 837 "Interaction Modeling in Mechanized Tunneling" (Ruhr-Universität Bochum) and Doctoral Programme for the Exploration of Complex Water resources (Vienna University of Technology). In 2013 the SFB members Prof. Tom Schanz, Mr. Shorash Miro and Dr. Steffen Freitag were invited to give lectures about Optimization Techniques, Meta-Modeling, Global Sensitivity Analysis, Probabilistic Analysis of Failure and Numerical Simulation with Uncertain Data in Mechanized Tunneling

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Top-cited article

at: Ruhr University Bochum

The member of the collaborative research center Dr. Steffen Freitag is a co-author of a publication, which is ranked as one of the Most-Cited articles from 2010 to 2011of the international journal Computer-Aided Civil and Infrastructure Engineering. This journal has an Impact Factor of 4,460 and is ranked #1 in three engineering categories (Construction & Building Technology; Engineering, Civil; and Transportation Science & Technology).
The paper with the title "Recurrent Neural Networks for Uncertain Time-Dependent Structural Behavior" authored by Wolfgang Graf, Steffen Freitag, Michael Kaliske und Jan-Uwe Sickert has been published 2010 in a Special Issue on Computational Intelligence in Structural Engineering and Mechanics.
Link to Webpage

 


International Workshop: Cutting tool - Soil Interaction
05.07.2013 - 12:00
at: Ruhr University Bochum

In the framework of the Collaborative Research Center "Interaction Modeling in Mechanized Tunneling" (SFB 837), a workshop on "Cutting Tool-Soil Interaction" is organized, focusing on modeling approaches for the excavation processes at the cutting wheel of tunnel boring machines in particular in soft soils. The workshop will be held on July 5th at Ruhr-University Bochum at the Convention Centre of the Ruhr-University Bochum.
Lectures:


  1. Prof. Klaus Hackl, (Ruhr University Bochum, Germany)

  2. Ir. Rudy Helmons, (Delft University of Technology, The Netherlands)

  3. Dr. Heiko Käsling, (Technische Universität München, Germany)

  4. Prof. Heinz Konietzky, (Technische Universität Bergakademie Freiberg, Germany)

  5. Dipl.-Geol. Florian Köppl, (Herrenknecht AG, Germany)

  6. Prof. Jerzy Rojek, (Polish Academy of Sciences, Poland)

  7. Dr. Falk Wittel, (Swiss Federal Institute of Technology Zurich, Switzerland)






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Cooperative Agreement between Brenner Base Tunnel SE (BBT SE) and the Collaborative Research Center 837 "Interaction Modeling in Mechanized Tunneling" (SFB 837)

at: Ruhr University Bochum

On 17.April 2013 a Cooperative Agreement between the Brenner Base Tunnel SE (BBT SE) and the Collaborative Research Center 837 "Interaction Modeling in Mechanized Tunneling" (SFB 837) has been signed by Prof. Konrad Bergmeister (CEO of BBT SE) and Prof. Günther Meschke (Speaker of SFB 837). The Brenner Base tunnel project is part of the Trans-European Network (TEN) plan of the European Commission, providing a high-speed north-south railway connection from Germany to Italy, crossing the Austrian and the Italian alps. With a length of 64 km it currently constitutes the largest railway tunneling projects worldwide. The Agreement constitutes the formal basis for a scientific and academic interchange between the two institutions. Aware of the importance of mutual cooperation and the historical chance of contributing to this significant infrastructure project, the two partners have agreed to promote scientific studies, Master- and Ph.D. theses, other research projects of SFB 837 as well as the exchange of academic and research information. A strategic committee represented by Profs. Bergmeister and Meschke will coordinate the cooperation in order to provide appropriate administrative assistance in each institution. On a yearly basis, an agenda taking into account both administrative and financial matters should be developed that ensures the precise selection and ideal coordination of the project topics and activities. A digital platform (internet portal e/o FTP-server) which serves both as an exchange and research tool enables to share open questions, research topics and other relevant areas of interest. Each of the projects will be conducted on the basis of a project-specific written agreement, determining the terms and conditions for their implementation.

 


Status Seminar 2013

at: Ruhr University Bochum

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SFB 837 Joint Workshop - Advances in tunneling research
16.04.2013 - 10:10
at: Ruhr University Bochum

On April 16th the Joint Workshop "Advances in Tunneling" in Cooperation between University of Cambridge (UK), Tongji University (China) and SFB 837 will take place at Ruhr University Bochum.

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Workshop IKC-CCE-SFB837: Excursion Day

at: Ruhr University Bochum

As a part of the social and cultural program that was organized for the foreign guests of the IKC-CCE-SFB837 Workshop, the excursion-group left Bochum early in the morning on Monday 15 April by coach and headed for the first destination: Düsseldorf. There they had an exciting tour to a Subway Construction Site (Wehrhahn Linie) which was accompanied by an interesting presentation of Dipl.-Ing Ingo Pöhler, Head of the Highway-, Tunnel- and City-Railway-Construction Department, Düsseldorf and Prof. Markus Thewes, Head of the Department for Tunneling and Construction Management at RUB, about the finishing of the metro trail near the shopping center Kaufhof under special conditions. After having lunch at the Television Tower of Düsseldorf during which the participants enjoyed a breathtaking view over the city-centre, the group headed for Cologne where a guided-tour of the famous Cologne Cathedral was the next agenda item. The typical sightseeing in the city centre was followed by a delicious dinner in a traditional Cologne restaurant. In a good temper the excursion-group returned to Bochum in the evening hours.

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Short Course: Messdaten-Verwaltungssystem GKSpro/TISSY − City-Tunnel Leipzig
28.11.2012 - 14:00
at: Ruhr University Bochum

For November, 28th SFB has organized two guest lectures at Ruhr University Bochum.
The two guest lectures will be held by
Dr.-Ing. Thomas Stolp - Gesellschaft für Informatikdienste mbH Eichwalde (Germany) and
Dr.-Ing. Stefan Franz - Deutsche Einheit Fernstraßenplanungs- und -bau GmbH Berlin (Germany)

The seminar exemplifies the data management system GKSpro/TISSY on the basis of the Leipzig city tunnel. The basic requirements on the project included transparent data structures for all measurement systems, the long term availability of measurement results and the centralization of data in view of the fact that assignments were given to the contractors on a lot-by-lot basis and the heterogeneous project structure (inner- city tunnel, installation of stops, connection to the existing traffic network, measures to support the construction ground).

Guests are sincerely welcome




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SFB837 guest lecture - challenges in tunneling
31.10.2012 - 15:30
at: Ruhr University Bochum

For 31 October 2012, 3:30 p.m., SFB 837 has organized two guest lectures at Beckmannshof, Ruhr University Bochum.

The two lectures form a part of a series of guest lectures and seminars organized by SFB 837. The goal of the series is to form the basis for a lively dialogue between SFB members, internationally renowned researchers and experts from industry. All topics of SFB 837 - from the numerical multiscale method to machine technology - will be addressed.

Guest lecturers:
Prof. Dr. Bergmeister, University of Natural Resources and Life Sciences, Vienna, Austria
Dr.-Ing. E.h. Martin Herrenknecht, Herrenknecht AG, Germany

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SFB837 Summer School on Risk at TU Wien

at: Ruhr University Bochum

In July 2012 SFB 837 contributed to a summer school on the topic "Risk" at TU Wien. The summer school, which was held between Sunday 29 July and Saturday 4 August 2012, was organized by Prof. Bucher (Professor of Structural Mechanics at the Institute of Building Construction and Technology of the TU Wien). Amongst other things, SFB 837 organized a session that addressed research topics from various SFB sub areas in the frame of the topics reliability and risk. In the frame of the event renowned guest lecturers presented on topics such as reliability, risk analysis and risk assessment. The summer school forms a part of cooperation between the Weimar Graduate School 1462 on the topic "Evaluation of Coupled Numerical Partial Models in Structural Engineering", the Vienna doctoral program for the exploration of complex water resources systems and SFB 837. A joint workshop in Weimar is scheduled for next year.


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SFB 837 meets Tongji - Joint workshop

at: Ruhr University Bochum

From July, 23rd. - 24th a joint workshop in cooperation with SFB 837 will be held at the College of Civil Engineering at Tongji University China.

The College of Civil Engineering has the traditionally advantageous civil engineering programs that are the oldest, strongest and most comprehensive in Tongji University.

The College consists of The Department of Structural Engineering, the Department of Geotechnical Engineering, The Department of Bridge Engineering, the Department of Surveying and Geo-informatics and Research Institute of Structural Engineering and Disaster Prevention.

In the frame of the workshop a cooperation agreement on the exchange of PhD candidates between the Faculty of Civil Engineering at Tongji University and the Faculty of Civil and Environmental Engineering Sciences at RUB has been concluded.



Click here to see photos

Link to Webpage


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SFB meets IKC (University Cambridge)

at: Ruhr University Bochum

On Wednesday, 20 June 2012 Ruhr-University Bochum welcomed a delegation from the University of Cambridge. The cooperation between the Cambridge Integrated Knowledge Centre (C-IKC) and SFB 837 lead a small group of researchers around Prof. Kenichi Soga to the Ruhr-Area to conduct investigations on sub project 4 (Heading Face Stability).
Apart from indulging in a lively exchange on the latest research findings at both universities the visitors were guided through the various research institutions at the Faculty of Civil and Environmental Engineering Sciences. Furthermore they gained insights into ongoing experiments, e.g. shotcrete experiments, that were conducted in the construction halls. In the frame of sub project A4 experiments were conducted on the macro scale (Department of Tunneling, Prof. Markus Thewes and Dipl.-Ing. Mario Galli) to determine the settlement of soil-foam-mixtures using serial photography. On the microscale the Department of Continuum Mechanics (Prof. Holger Steeb and M.Sc. Aycan Özarmut) presented on their rheological investigations on particle-foam-mixtures. In the future the cooperation should further be extended, especially on a doctorate level. The scheduled visits between IKC and SFB 837 will surely fulfill this goal.


zu den Fotos


 


RUB GIRL'S Day: Lightnings in the laboratory and colorful concrete

at: Ruhr University Bochum

This year's Girl's Day on 24 May 2012 gave female pupils the chance to learn in own experiments that concrete is "colorful" and versatile. They also learnt how to let hearts flash up electronically. With numerous natural-scientific workshops and comprehensive information on university studies RUB contributed to the so-called Girl's Day - a nationwide initiative to spark female pupils interest in natural scientific study programs and professions. The Girls Day is addressed to female pupils who are working towards a high school diploma. The RUB Faculty of Civil and Environmental Engineering Sciences in cooperation with SFB 837 informed prospective female Civil Engineering students about study programs and career opportunities in research and practice. A workshop on the material behavior of concrete aroused the participants interest for tunneling-related issues, as the following pictures prove.

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Workshop: Lining in mechanized tunneling
18.06.2012 - 09:00
at: Ruhr University Bochum

Tunnel lining with prefabricated lining elements is of special importance in mechanized tunneling. The linings are in constant interaction with the tunnel and the surrounding ground. Both the design of the lining and the grouting of the annular gap have improved rapidly over the past few years. The specific loads and surrounding conditions during the production process, installation and usage should be paid special attention to. On the one hand, advances are due to appropriate experimental investigations. On the other, numerical methods allow corresponding predictions of long-term behavior. The workshop presents and discusses current developments and experiences in tunnel lining and the grouting of the annular gap.




Registration



Registration for RUB-Staff





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Status Seminar 2012

at: Ruhr University Bochum

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Seminar: TBM technology seminar
31.05.2012 - 09:00
at: Ruhr University Bochum IA 5/21

Dipl.-Ing. Ruben Duhme, Herrenknecht Asia Headquarters Pte.Ltd.



The TBM technology seminar examines the principles, design and working conditions of all common types of tunnel boring machines from the view- point of a machine manufacturer. The participants will get an overview of the whole process - from the analysis of the geotechnical conditions and the resulting machine types to the actual design concepts devised within the planning phase of a project. Further- more an idea of the various challenges and unforeseen events which might strongly affect the success and economic efficiency of a project is given. Finally, the seminar discusses aspects such as earth pressure and mixshields as well as the different types of TBM used in hard-rock.



Anmeldung


Anmeldung für Rub-Mitarbeiter



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SFB meets IKC (University Cambridge)






20.-21. March: SFB 837 meets IKC Cambridge

On 20 and 21 March 2012 a delegation from the SFB 837consisting of 10 researchers will travel to the University of Cambridge to participate in a workshop hosted by the "Innovation and Knowledge Centre" (IKC) on Smart Infrastructure and Construction. The workshop aims at consolidating the close research cooperation between SFB 837 and the University of Cambridge / IKC, and furthermore, at exchanging the latest research results in the field of smart infrastructure. Within the frame of the workshop five projects will be presented by both research partners (see SFB topics and abstracts below).





"Innovation and Knowledge Centre" (IKC), University of Cambridge:

The "Innovation and Knowledge Centre" (IKC) on Smart Infrastructure and Construction at the University of Cambridge is focused on Smart Infrastructure and Construction and combines business knowledge with the most up-to-date research to harness the full potential of emerging technologies. IKC is led by Professor Robert Mair and Professor Kenichi Soga of the Civil Engineering Division of the Department of Engineering. Innovation and Knowledge Centers are center´s of excellence with five years" funding to accelerate and promote business exploitation of an emerging research and technology field. Their key feature is a shared space and entrepreneurial environment, in which researchers, potential customers and skilled professionals from both academia and business can work side-by-side to scope applications, business models and routes to market. In this respect, IKC are quite comparable to the German SFBs (Sonderforschungsbereiche / Collaborative Research Centers).



The Cambridge IKC is funded by the Engineering and Physical Sciences Research Council (EPSRC), the Technology Strategy Board, and by industry with a total amount of £17 million. Funding for the Cambridge IKC will be £10million from EPSRC and the Technology Strategy Board, with an additional £7million from a number of industry organisations.


The Cambridge research centre links research in sensor and data management with innovative manufacturing processes to provide radical changes to the construction and management of infrastructure. The aim is to transform the industry through a whole-life approach to achieving sustainability in construction and infrastructure, covering design and commissioning, the construction process, exploitation and use, and eventual decommissioning.






 


Uncertainty and Artificial Intelligence in Structural Analysis
07.02.2012 - 14:30
at: Ruhr University Bochum IA 6/21

Structures should be resistant against a multiplicity of environmental actions during their lifetime. The applications of new materials in engineering practice as well as the evaluation of existing structures require knowledge about the time-dependent behavior. Structural monitoring is a possibility to get information. In addition to in situ monitoring of existing structures, numerical or real tests can be performed to investigate time-dependent material and structural behavior. The obtained data sequences can be used to identify structural parameters, which are required to predict structural responses and to assess serviceability, reliability, and lifetime.

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Guest lecture on Modeling of Tunnels for Construction and Maintenance
02.11.2011 - 10:00
at: Ruhr University Bochum

In this talk, fi rst, a product model of shield tunnels, called IFC-ShieldTunnel, which was developed several years ago by us in Japan, will be presented by putting emphasis on conceptualization of shield tunnels, geometric modeling of soil layers, and implementation and visualization of instance files. Next, a product model for representing cut & cover tunnels will be presented.
The motivation of modeling cut & cover tunnels is not just visualization and compatibility to various 3D CAD systems but for modeling and representing changes of constructed structures with the process model like 4D models.
Finally, our on-going research on modeling degradation of reinforce oncrete (RC) entities will be briefly introduced.


Abstract



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Workshop: Preliminary explorations in mechanzied tunnling
11.10.2011 - 13:00
at: Ruhr University Bochum

Reliable preliminary explorations are essential for the safety and efficiency in mechanized tunneling. The workshop addresses current developments in view of preliminary exploration methods and computer-aided identification methods.


Guest lecturers:


- Dr. Thomas Dickmann

   (Amberg Technologies AG, Switzerland)


- Dr. Rüdiger Giese
   (German Geo Research Center, Germany)


- Dipl.-Geol. André Heim

   (Herrenknecht AG, Germany)


- Dr. Stefan Jetschny

   (Karlsruhe Institute of Technology, Germany)


- Jun.-Prof. Frank Wuttke

   (Weimar Bauhaus-University, Germany)


Click here to register



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Workshop - model qualities
26.09.2011 - 12:30
at: Ruhr University Bochum

In all engineering disciplines numerical models with varying complexities are used in development, research, planning and for observation purposes. When it comes to the development of reliable models the required model quality and the definition of the mostly enormous number of model parameters are crucial questions. The goal of the workshop is to join researchers from three associated research projects (Ruhr-University Bochum, Weimar Bauhaus University, Vienna University of Technology) to discuss these questions in an interdisciplinary context on the basis of the developed numerical models and methods. The workshop should create a suitable, informal setting to exchange experiences and strategies in terms of model development and the assessment of model qualities.
Further, it should pave the way for future cooperation between the three projects.

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International Workshop SFB837 - Computational Modeling in Geomechanics and Tunneling
07.07.2011 - 13:30
at: Ruhr University Bochum

UPDATE

!!! Workshop location changed to Ruhr-University Bochum !!!




The workshop will address recent advances in computational modeling of soft soils and of interactions between
the ground behaviour and machine-driven tunnel construction.



Invited Guest Lecturers:

  • Prof. Ronaldo Borja
    (Stanford University, USA)

  • Prof. Carlo Callari
    (University of Molise, Italy)

  • Prof. Antonio Gens
    (Universitat Politècnica de Catalunya, Spain)

  • Prof. Kenichi Soga
    (University of Cambridge, UK)

  • Prof. em. Pieter Vermeer
    (University Stuttgart, Germany)

  • Prof. Andrew Whittle
    (Massachusetts Institute of Technology, USA)

  • Accommodation recommendation:


    Ibis Bochum Zentrum Universitätsstr. 3, 44789 Bochum


    Park Inn Bochum Massenbergstr. 19-21, 44787 Bochum



    for discount in Park Inn Hotel please say accomodation is for RUB SFB837 Workshop



    Workshop Program

 


Seminar: Strain Localization in Partially Saturated Porous Media: Thermodynamics, Numerical Formulation, Applications
06.07.2011 - 15:00
at: Ruhr University Bochum IA 6 / 21

It is presented an analysis of discontinuous displacements and corresponding singular strains in variably saturated porous media, considering also the discontinuous flows and the corresponding singular distributions of fluid contents, to model the accumulation/drainage of gas and liquid along the localized failures . In this analysis, the continuum response is described by a three-phase poroplastic model, whose hyperelastic part is a simplifi ed version of more general laws recently developed within a computationally oriented thermodynamic approach based on Biot work .



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Status Seminar 2011

at: Ruhr University Bochum

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Girls Day on 28 April 2011
28.04.2011 - 10:00
at: Ruhr University Bochum

Like in the past few years this spring too, the so-called "Girls Day" took place at universities throughout Germany. Ruhr-University also participated in the event, opening its doors to female pupils between 14 and 16 of age. The goal was to give them an impression of study programs and research institutions in which women are traditionally a minority. In more than 30 natural-scientific workshops participants gained insights into engineering practice and had the chance to prove their practical skills.
Several departments of the Faculty of Civil and Environmental Engineering Sciences along with their SFB 837 sub projects also contributed to the Girls Day. Illustrating some specific aspects form the areas of tunneling and foundation engineering it was shown how interesting and exciting the work of an engineer can actually be. Various presentations and workshops on topics such as "Concrete is colorful" (Caroline Köster / Department of Building Material Techniques / Prof. Dr.-Ing. R. Breitenbücher); Christina Fust / Department of Structural Engineering / Prof. Dr.-Ing. P. Mark) and Foam Party in Tunneling: How the hole comes into the mountain and what role does foam play in that senseć (Mario Galli / Department of Tunneling, Pipeline Technology and Construction Management / Prof. Dr.-Ing. M. Thewes ) aroused the participants' interest for tunneling-related issues and inspired a new generation of scientists.




Click here to see photos

 


INTERACTION MODELING IN MECHANIZED TUNNELING - Application of Non-probabilistic and Probabilistic Concepts in Finite Element Analysis of Tunnelling
01.04.2011 - 11:00
at: Ruhr University Bochum IA 6/21

To deal with uncertainties in geotechnical problems, non-probabilistic or imprecise probability methods eveloped in the last two decades are applications in tunneling practice. One nonprobabilistic method that can be combined with numerical methods without modifications of the numerical simulation code is investigated.



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INTERACTION MODELING IN MECHANIZED TUNNELING - On the Influence of Soil Models on the Results of Tunneling Simulations and the Consequences of EC7 for Tunneling Design
31.03.2011 - 16:00
at: Ruhr University Bochum IA 6 /21

Finite element analyses are routinely performed in the design phase of tunnel construction. When tunnels with low overburden in soils are considered the infl uence of the constitutive model employed for describing the mechanical behaviour of the soil has a signifi cant infl uence on calculated displacements and lining stresses and consequently on the tunnel design. In the presentation this will be addressed by comparing the results obtained from different constitutive models for a simplified tunnel excavation problem.



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Guest lecture - Large-scale Scientific Computing in FEM Simulations
13.12.2010 - 13:00
at: Ruhr University Bochum IA 6/21

The finite element method (FEM) has become an established technique for numerical solution of differential equations. This course begins with a short introduction to large-scalescientific computing in FEM applications. Iterative methods play an important role in FEM simulations. Numerous properties of the problem may affect the efficiency of the solution. A particular focus of the presentation is on algorithms for the solution of large-scale sparse FEM matrices.



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Guest lecture - Continuum Theory of Mixtures - Application to Debris Flow Modeling
09.12.2010 - 14:00
at: Ruhr University Bochum IA 4/56

Basics of continuum mixture theory in thermodynamical context (Part I) with application to shallow gravity driven fl ows (Part II) will be presented. Part I: First miscible mixtures are discussed. To illustrate the ideas underlying the thermodynamics of mixture theory a simple example (diffusive motion in a heat conducting fluid) is considered. Then, immiscible (multiphase) mixtures, for which the volume fraction plays a central role, are introduced. Results from Schneider & Hutter (2009), will be discussed.



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Guest lecture - Homogenization Theory & Multiscale Methods
07.12.2010 - 09:00
at: Ruhr University Bochum IA 4/56

Modeling and numerical simulations of fractured, vuggy, porus media is a challenging problem which occurs frequently in reservoir engineering. The problem is especially relevant in fl ow simulations of karst reservoirs where vugs and caves are embedded in a porous rock and are connected via fracture networks at multiple scales. This short course will introduce to basic concepts of homogenization theory such as upscaling diffusion and elasticity problems with highly oscillatory periodic coefficients. An overview will be given also of methods for problems with no clear scale separation as well as for nonlinear problems.



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Guest lecture: Towards a High Performance and Robust Multi-Physics Framework
23.11.2010 - 10:30
at: Ruhr University Bochum

The multi-physics problems, specially the Fluid Structure Interaction (FSI), are complex by nature. Even more dealing with these problems usually involves several practical diffi culties such as large scale analysis and dirty model handling. The floating platforms in deep seas are good examples of this kind of problems. So the high performance computing and robustness become the essential requirement for a framework in this area. This leads developers from one side to develop more robust solutions and on the other side to use resources like big multi-core machines, clusters and GPUs.



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Guest lecture: Standard Finite Element and Particle Methods Lagrangian-Lagrangian & Lagrangian-Eulerian methods
22.11.2010 - 12:30
at: Ruhr University Bochum IA 6/21

The simulation of problems involving complex topological changes, requires the use of advanced techniques in order to allow tracking correctly the changes in the geometry. The use of Lagrangian particle methods, such as the PFEM allows a natural coupling with existing FE approaches and as such provides a very natural way for dealing with problems that can not be treated in other ways. Interestingly both surface coupled problems and volumecoupled problems can be treated by combining state of the art FE with the PFEM.



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SFB Short Course 2010

at: Herrenknecht AG, D-77963 Schwanau

On November, 15th and 16th the SFB short course took place. The Course intends to provide basic knowledge on mechanized tunneling to all researchers involved in the SFB. In particular, the ground behavior, machine types, the excavation process and the lining construction are addressed.



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Kick-off meeting 2010

at: Ruhr University Bochum

See photo gallery of this event



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Job vacancy Junior Researcher (Post-Doc)

at: Ruhr University Bochum

SFB 837 "Interaction Modelling in Mechanized Tunneling" at Ruhr-University Bochum is looking for a junior researcher (Post Doc) in the field of uncertainty and risk modelling. Candidates are expected to establish a team of junior researchers focusing on Fuzzy Randomness (stochastic, informal and lexical uncertainty treatment) and its corresponding applications in engineering sciences.

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Equal opportunities measures at RUB Cooperative Research Centers

at: Ruhr University Bochum

To ensure the implementation of equal opportunities measures for researchers at RUB, cooperative research centers and graduate schools in cooperation with the RUB Administrative Office for Further Education and Counseling (IFB) have developed a concept for the career development of female junior researchers and the promotion of gender sensibility among young scientists. The concept is designed as to match with the RUB overall equal opportunities concept by building on the existing know-how and synergy effects. The developed target group-oriented measures complement on the existing equal opportunities measures offered by IFB while taking into account the conditions and requirements of the supported programs. The cooperation and the jointly implemented measures expand the interdisciplinary network of junior researchers and promote interdisciplinary exchange. Link to Webpage

 


Radar interferometry applied at Dusseldorf Wehrhahn Line - sub project D3

at: Ruhr University Bochum




In the context of SFB 837 "Interaction Modelling in Mechanized Tunelling" at Ruhr-University Bochum the Department of Structural Engineering made use of latest technologies to investigate the effects of tunneling-induced settlements on existing structures. The TerraSAR-X Satellite (DLR) allows the precise and comprehensive monitoring of settlements during the construction of the Düsseldorf Wehrhahn Line. Persistent Scatterern Interferometry (PSI), which is used for this purpose, allows the accurate determination of settlements at many locations to the precise millimeter under optimal boundary conditions. The goal of the project is to develop a method to assess the risk of damage through mechanized tunelling for a classified structure.





In 2007, the TerraSAR-X Satellit was brought into operation by the German Aerospace Center and has since then been delivering information about the earth surface, independently from the weather conditions or time of day. In a height of 514 km the satellite is in a polar circular orbit about earth. It passes the same area on earth, e.g. the Dusseldorf Werhahn Line, every 11 days. Records of the Wehrhahn Line have already been made since spring 2011. They will be continued even after the tunneling process is completed.
The project team not only consists of RUB researchers, however. The Department of Geodesy and Photogrammetry at TU Braunschweig converts the satellite data into settlemement information and makes it available for futher use through a geo information system. Furthermore the project is supported by the city of Dusseldorf, Dusseldorf engineering company Grassl and the German Aerospace Center.
First results will approximately be available in early 2012.








 


 

 

 

 

On May 18, 2010, the German Research Foundation (Deutschen Forschungsgemeinschaft, DFG) announced the start of a new Collaborative Research Center (Sonderforschungsbereich, SFB) 837 for the research of "Interaction models in mechanized tunneling" to be carried out at the Ruhr-University of Bochum (RUB), Germany. The collaboration consists of 14 subprojects and will run for a total of 12 years. The initial funding for the first four years is over 8 million euros (German press release).

Beginning July 1, 2010, the new Collaborative Research Center "Interaction models in mechanized tunneling" will start at the Faculty of Civil and Environmental Engineering and at the Faculty of Geosciences at the Ruhr-University of Bochum, Germany. Speaker and Principal Investigator of the Research Center is Prof. Dr. Meschke.


The topics of research for each of the 14 subprojects in the Collaborative Research Center are:

  •   Recognition of subsoil types based on the analysis of machine data
  •   Concepts of underground exploration using acoustic techniques
  •   Investigation of the stability of tunnel faces
  •   Material models for the specification of destructuring subsoil behavior
  •   Optimization of the durability of tubing segments
  •   Damage analysis of tunnel linings and supports
  •   Development of grout materials considering possible interactions with the subsoil
  •   A multi-scale infiltration model for grout materials
  •   Process oriented simulation models for mechanized shield driving
  •   Methods of system identification for the adaptation of numerical simulation models
  •   Model and monitoring-based optimization of process work flows
  •   Simulation models of the interaction between rotary cutters and subsoil
  •   Development of a computing platform for "Interaction models in mechanized tunneling"
  •   Simulation-based risk analysis for heterogeneous above-ground housing

Further information (in German) on the Collaborative Research Center 837 can be found in Zusammenfassung.