The Numerical Analysis of Deformation Field of Layered Soils Subjected to Moving Impact Load By Means of the Fluid-Structure Coupling

摘要

The key factors for the study of soft subgrade under impact loading are the model of soil constitutive, the model of foundation - water and the impact load. The stress-strain relationship on soil is simulated by Mohr-Coulomb constitutive mode. Considering underground water level, foundation structure space model is established by FLAC3D. When subgrade is impacted by moving impact load based on fluid-solid coupling, the laws of underground water level and settlements are discussed detailedly. The results of the study indicate that: the settlement effected on the edge is more than on the middle. The underground water level is rose when the impact load is on the edge, and it is dropped on the middle. It appears negative pressure above underground water level.