Numerical model for dynamic analysis of soil liquefaction

This paper presents an effective stress-based numerical model for dynamic analysis of soil liquefaction considering the effect of confining pressure on of dynamic properties soil, which can be used to describe the pore pressure increment and the consequent loss of soil strength due to earthquake-induced shaking. The emendatory hyperbolic model which meets Massing rule is adopted for nonlinear analysis of soils in numerical model. The pore pressure generation is calculated using the equivalent cycle pore pressure model developed by Ishibashi and Sherif et al. To demonstrate the reliability of the new method for dynamic soil liquefaction analysis, a two-dimensional numerical model is directly established to simulate shaking table test for seismic response of liquefiable ground, the parallel spring-damper connection is used to simulate the artificial boundary of computational domain and the Wilson-θ integral method is selected to solve dynamic equations of seismic response. The results obtained from the new analysis agree well with recorded accelerations and pore pressure ratio in the shaking table test, which shows the reliability and validity of the numerical model.