Analysis of response of level ground subjected to earthquake is one of the most active research areas in geotechnical earthquake engineering. In this paper

seismic response including propagation of acceleration

development of pore pressure

lateral displacement and settlement

of a level ground consisting of 15 m saturated sand is analyzed

by using the finite element procedure SUMDES 2006

incorporating a critical state constitutive model for sand. Effects of model parameters on seismic ground response are studied by adjusting the values of parameter by 10 %. The analytical results show that

among these parameters

the critical state stress ratio M and

the intercept of the critical state line on the axis in the e - plane

impose stronger effect. Therefore

the accuracy of the two parameters should be secured when the parameters are calibrated against the experimental data. The results also imply that the number of parameter in the model may be reduced when it is applied to the analysis of seismic response of level ground.