Subproject C1

Process-Oriented Simulation Models for Mechanized Tunneling


Subproject C1 is concerned with the holistic process oriented numerical modeling of the mechanized tunneling process in order to predict and to provide recommendations on spatial and time-sensitive steering parameters during the design phase as well as during the construction phase of a tunnel. The simulation model used for this purpose is developed within the framework of the Finite Element Method. It enables the realistic simulation of the relevant interactions between the tunnel boring machine, the surrounding soil, and any on-site above ground structures. It is applied to investigate the tunnel face stability, to predict tunneling induced lining forces and settlements, taking uncertain geotechnical parameters into account. This model is also employed within a simulation and monitoring based assistant system to support the steering of the mechanized tunneling process in real time.

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Simulation and Monitoring-based Assistant for Real-time steering in mechanized Tunneling (SMART)

Numerical simulation of a selected section of the reference project Wehrhahn-Line in Düsseldorf: Digital city model (left), FE model (middle) and simulation result for the settlements (right)

Analysis of 3D tunnel problem using Enhanced Assumed Strain (EAS) formulation for the prediction of failure mechanism at the tunnel face: a) developed displacement field at failure, b) deviatoric plastic strain, c) the predicted 3D failure surface derived from the enhanced modes, d) lateral view, e) frontal view and f) top view of the failure surface