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  Real-time TBM Steering Assistance System Using Numerical Simulation and Monitoring Data

  Currently monitoring data are used to support the TBM steering, i.e. selecting the grouting and face pressures to control surface settlements and guaranty face stability. In this work, a new concept is presented combining monitoring based steering with finite element (FE) simulations. The idea is to generate a comprehensive FE model in the design stage of a tunnel project, which incorporates all important components and their interactions. Uncertain parameters can be considered as intervals, fuzzy numbers, or stochastic distributions based on the available data from geotechnical reports. For real-time applicability during the construction process, surrogate models are employed to substitute the FE model to predict uncertain time variant settlement fields and the safety of the tunnel face in real-time for selected steering parameters. The surrogate model is continuously updated by monitoring data to improve its prediction capability, especially in case of unexpected situations. Mechanized tunneling; Numerical simulation; Surrogate model; Monitoring; Real-time prediction; Uncertainty.

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