ABSTRACT
In order to investigate the Stress Distribution of Subgrade (SDS) accurately in high-speed railway engineering, a Three-Dimensional Finite Element Model (3D FEM) is established and validated with experimental results in this dissertation. A full-scale laboratory test rig is built based on the actual structure of high-speed railway ballast track and subgrade. The dissertation carries out an experiment on the rig about the test of SDS under different cyclic loading conditions. The dissertation establishes a 3D FEM for high-speed railway ballast track and subgrade considering the detailed structure of each part and the connections between different parts. And it calculates stresses at different positions in subgrade in the model. According to the comparison of test results and simulated results under different conditions, the stress values are basically consistent with each other which indicate that the 3D FEM of high-speed railway ballast track and subgrade is reliable. And it will advance the further analysis of stress distribution of subgrade under different conditions of ballasted bed.
