Abstract
This chapter describes a three-dimensional (3D) finite element (FE) model developed based on the integration of a semianalytical approach and a dynamic-substructure method to evaluate the vibration responses of a tunnel-soil system subjected to train loads. The proposed model adopts an explicit integral approach to analyze the complex system in the time domain and compares favorably over the existing methods. The proposed model is computationally much more efficient than the traditional FE approach for solving dynamic responses of complex systems and is also capable of modeling highly nonlinear loads in the vehicle-track-tunnel-soil system. The selection of modeling parameters is then investigated to ensure good calculation efficiency. The model is then used to calculate the dynamic responses of the tunnel and soil system under single and multiple train loads.
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