Development of pore pressure will exert an effect on the effective stress of soil and transmission of seismic waves through soil skeleton.This paper presents the study of sand ground responses under shaking of different intensities by use of centrifugal dynamic tests and numerical analyses.The centrifugal test and numerical analysis results are used to verify the simplified procedure for evaluating the liquefaction potential of soil.It is found that soil liquefaction results in attenuation of acceleration when the shaking is strong.Fully coupled analysis can reproduce the development of excess pore pressure and attenuation of acceleration

but the total stress analysis overestimates the acceleration on the ground surface.It is shown that the evaluation of the peak acceleration on the ground surface should incorporate the influence of site amplification

but neglect the influence of excess pore-water pressure when using the simplified procedure for evaluating the liquefaction potential of soil.