Experimental Study on Dynamic Shear Strength of Saturated Clay

Dynamic simple shear tests under undrained conditions were conducted to obtain the dynamic shear strength of normally consolidated soil, which is contained a clay at the rate of 98per cent. Dynamic shear stress pulses were superposed on the sustained shear stress equal to 0,10,25,50,75 per cent of the static shear strength. Particularly, in these experiments, the following significant results were obtained. (1) The degree of the sustained shear stress ratio Δτ/τ, had considerable effect on the apparent cohesion, but had no significant effect on the angle of the internal friction. (2) In the case that the sustained shear stress equals to zero, pseudo liquefaction occurs in a clay.