Effect of consolidation stress ratio on dynamic strength and dynamic pore water pressure of soil

To study the effect of consolidation stress ratio on soil dynamic strength and dynamic pore water pressure,firstly the related previous research results were reviewed,then the dynamic triaxial tests with saturated gravel samples from the foundation of a rockfill dam were performed.The results of dynamic strength tests showed that there was a turning point of consolidated stress ratio Kc′.When KcKc′,dynamic strength decreased while dynamic deformation and dynamic pore water pressure increased with the increase of Kc.The value of turning point Kc′ depended on the soil properties and stress condition.The approximate value of Kc′ was equal to 2.8 in this test when Kc=0.5～3.0.When Kc=0.7～1.3,final pore water pressure could be equal to confining pressure,and when Kc exceeded or equaled 1.5,the possibility of liquefaction of samples depended on whether the dynamic stress σd could stretch samples or not.