Abstract
A series of undrained cyclic triaxial tests was performed on sand and clay mixture. The samples were prepared by mixing silica sand and marine clay with six kinds of mixing ratio. The tests were carried out under both isotropically and anisotropically consolidated condition. The liquefaction was observed in the samples with fines contents less than 9.8% in which the pore pressure developed up to initial confining stress. While the cyclic strength for isotropically consolidated samples was monotonically increased with increasing fines contents, that for anisotropically consolidated soils decreased With increasing plasticity index. The cyclic strength for anisotropically consolidated sample with Fc=19.6% shows the largest value among them because both sand particles and fines matrix contributed to mobilize the strength. The stlength became similar for the samples with fines contents greater than 30%.
