Dynamic Response Of Saturated Silt Soil And Liquefaction By The Subway's Vibration

In this dissertation, the main problem about liquefaction which will possibly happen in the silt base under vibration of subway train has been studied and analyzed; this dissertation's research is focus on numerical simulation about vibration of subway utilized numerical analysis method.This research is based on the known achievements of subway's vibration which are made by some experts and scholars in this field. By analyzing a large amount of documents which is in terms of the characteristic of subway's vibration, the property of the loads, the way of identifying the vibration loads, mechanism of liquefaction of saturated silt, the characteristic of the wave's spread in silt, the rules of the wave's wading, silt groundwork's dynamic response, combining the loads data which was measured by the spot survey. In order to make the results of numerical analysis and the facts as conciliated as possibly, this dissertation uses finite element software ANSYS and finite difference software FLAC to build the silt groundwork and tunnel structure computation models including both two dimensions model and three dimensions model, and also uses numeral analysis method to simulate dynamic response of groundwork and pore water pressure development regularity of saturated silt groundwork , both of which are analyzed under different engineering situations. The main content includes development situations in different part of groundwork of subway and different time of load of subway train, which are all simulated and calculated in the computation model under developing saturated silt pore water pressure.This dissertation has a reference value to subway system designation in certain degree, and also does an elementary discussion about the liquefaction mechanism of saturated silt groundwork.