Saturated sand foundation will be liquefied under strong earthquakes

leading to strength decrease

with phenomena such as settlement

lateral slippage and wet sand blasting.Based on constitutive model for sand liquefaction proposed by YANG Zhao-hui

nonlinear dynamic finite element analysis of seismic responses of saturated sand site was executed by use of OpenSees;mechanism of liquefaction and effect on foundation were expounded.Furthermore

after changing soil property and amplitude

duration

frequency of earthquake

the results of numerical simulation were compared;influence of these factors on seismic responses of liquefiable site was analyzed.The results show that:saturated loose sand site is more likely to be liquefied;site is more likely to be liquefied under stronger earthquakes;long-duration earthquakes are more likely to cause liquefaction;high-frequency earthquakes and low-frequency earthquakes are both not likely to cause liquefaction

and an intermediate frequency most likely to cause liquefaction exists.