Dynamic Responses of Saturated Transversely Isotropic Ground Subjected to High-Speed Train Load

Abstract

A u-p format 2.5D finite element method (FEM) is proposed to investigate the ground vibration and distribution of pore water pressure in transversely isotropic saturated medium subjected to high-speed train load. The governing equations are derived based on Biot’s theory in frequency domain by applying Fourier transform with respect to time. The Galerkin method is then employed to develop the 2.5D FE model. Verification of the model is carried out by comparing the predictions with published data. Effects of soil parameters on the dynamic responses of ground are investigated in detail. Results indicate that the increase in vertical elastic modulus contributes much more to the decrease in displacement amplitude of ground and maximum amplitude of pore water pressure in soil, compared to that of horizontal elastic modulus. Both horizontal and vertical Poisson ratios have insignificant effects on ground vibration, while the change of Poisson ratio lead to a great change in the maximum amplitude of pore water pressure. Effects of shear modulus on both ground vibration and maximum amplitude of pore water pressure are negligible.