Liquefaction properties and dynamic FEM analysis of the dam foundation of reservoir under seismic load

In order to analyze the liquefaction and dynamic properties of the reservoir dam foundation under seismic load,the silt and silty sand pore pressure accumulation properties are firstly obtained by indoor dynamic triaxial tests,the liquefaction criterion of whether the cyclic shear strain reaches 5% is also established.Then,the liquefaction evaluation of silt and silty sand is made according to the results of the standard penetration tests in-situs(SPT) and indoor dynamic triaxial tests;the results of them are then also compared.At the same time,on the basis of liquefaction evaluation,the non-linear dynamic FEM analysis by using effective stress method is performed.The effect of whether taking account of seepage effect is studied with the zone of the liquefaction.The results of the dynamic FEM analysis,indoor tests and SPT are compared.Some useful conclusions may be provided for references.