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

In order to analyze the liquefaction and dynamic properties of the dam foundation under seismic load,the pore pressure accumulation properties of the silt and silty sand are firstly obtained by dynamic triaxial tests indoor,the liquefaction criterion that 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-situ(SPT) and dynamic triaxial tests indoor,the their results are also compared.At the same time,on the basis of the liquefaction evaluation,the non-linear dynamic FEM analysis of the silt and silty sand in the dam foundation is performed by using effective stress method.The effect with and without taking account of seepage effect is studied in 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.