ABSTRACT
Seed and Martin et al. (Seed H B, 1975 & 1976) proposed a stress model to calculate the average pore water pressure according to the dynamic triaxial experiment data of isotropic consolidation sand under undrained conditions. Finn and Lee et al. (1977) amended the Seed and Martin model considering the effect of initial shear stress on dynamic pore pressure. Martin and Finn et al. (1975) established a seismic vibration strain model of pore water pressure on the basis of the consistency condition of saturated soil volume change. Byrne (1991) utilized the experimental data to establish the experience function between accumulated volume strain and the incremental volume
1 INTRODUCTION
Earthquake-induced liquefaction is a common phenomenon. The root cause of liquefaction is that the pore water pressure increase and then soil layers liquefy under the ground motion. In recent years, with the development of computer technology, many scholars are using numerical simulation method to simulate the development of pore pressure and liquefaction characteristics during the vibration of the engineering site. Its primary problem is to use the reasonable soil dynamic constitutive model and the vibration pore pressure model for describing the phenomenon of sand liquefaction and its programming.
