Surrogate Modeling for Interactive Subrectangular Tunnel Track Design using the Cut Finite Element Method
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Tunnels with non-circular shapes, e.g. sub-rectangular profiles, have caught interest in the geotechnical engineering community recently due to their high usage ratio. The research in the literature so far mainly deals with the reduced model, e.g., 2D analysis in the linear elastic continuum, to study the forces profile on the tunnel. In contrast, little research has focused on the subrectangular tunnel in 3D settings and its interaction with the surrounding soils in a process-oriented excavation scenario. This work introduces the subrectangular profile in the 3D simulation framework based on CutFEM-IGA (CutIGA). This framework allows the adaptation of the lining track efficiently, enabling a new paradigm in subrectangular track design. To realize this objective, a two-step procedure is proposed. Firstly, a surrogate model is constructed by using results from CutIGA analysis in terms of stress and displacement as input for the machine learning model. Subsequently, a user-friendly application interface is developed to extract the results from the surrogate model, enabling efficient track design procedures.
