Based on the meachnical behaviors of representative soil layer in Shanghai

several computation profiles with different soil layer constructions are built. An effective-stress procedure

in which the bounding surface hypoplasticity model and Biot consolidation formulation are coupled

is used to analyze the effect of soil layer constructions on liquefaction of sandy soil. The results show: the thickness of covering soil layer increases

peak pore pressure ratio of sandy soil decreases; when it is softer

shear stress of sandy soil increases firstly

then decreases; but harder

it increases continuously. The deeper underlying soil layer is

the smaller peak pore pressure ratio and the more shear stress of sandy soil is; both are not obvious. But

if softer

the peak pore pressure ratio of sandy soil changes more sharply.