Chapter 5 - 2.5D FE–BE Model for the Prediction of Train-Induced Vibration From a Tunnel in Saturated Soil

Abstract

This chapter develops a coupled two-and-a-half-dimensional (2.5D) finite element–boundary element (FE–BE) model to predict the train-induced vibration from a tunnel embedded in saturated soil. The 2.5D FE model is used to simulate the tunnel. Using the dynamic 2.5D Green’s function derived in Chapter 4, a 2.5D BE model for a saturated porous media is developed to simulate the surrounding soil. The 2.5D BE model and the 2.5D FE model are combined via the boundary conditions on the tunnel-soil interface. By coupling the track and train models with the tunnel-soil model, the coupled vehicle-track-tunnel-soil model is developed to investigate train-induced vibration from underground railways. After comparing existing models, the train-induced vibration from a quasi-rectangular tunnel embedded in saturated soil is calculated and analyzed.