通过两种不同黏粒含量的淤泥质粉质黏土动三轴试验，研究了黏粒含量对试样无侧限抗压强度及灵敏度、动残余应变和动残余孔压的影响。结果表明，黏粒含量高试样的无侧限抗压峰值强度小于黏粒含量低试样的相应强度；黏粒含量高试样的灵敏度大于黏粒含量低试样的相应值；随着动荷载的增加，试样的动残余应变与动残余孔压不断增大，重塑与原状试样动残余应变差值与比值也在增大，并且比值都大于各自的灵敏度；相同动荷载作用下，重塑试样的动残余应变均高于原状试样，黏粒含量高试样的动残余应变比黏粒含量低试样的大。分析认为，土体中黏粒的粘结与润滑双重作用导致两种黏粒含量的试样出现了不同的试验结果。最后采用幂函数模型对渐稳型动残余应变曲线进行拟合，建立了包含循环应力比与振动次数的动残余应变经验公式。

Through dynamic triaxial test, we investigate the effect of clay content on unconfined compressive strength, sensitivity, dynamic residual strain, and residual pore pressure of two mucky silty clays with different clay contents. Result shows that the unconfined compressive peak strength of specimen with high clay content is lower than that of specimen with low clay content; the sensitivity of sample with high clay content is greater than that of sample with low clay content. Dynamic residual strain, dynamic residual pore pressure and difference of dynamic residual strain between reconstituted and undisturbed sample increase as dynamic loading increases. Ratio of reconstituted dynamic residual strain to undisturbed dynamic residual strain also increases with increasing of load, and this value is greater than their sensitivity. The dynamic residual strain of reconstituted sample is greater than that of undisturbed sample under the same load. Also the dynamic residual strain of sample with more clay content is larger than that of the sample with less clay content in the case of similar dynamic stress. We conjecture that cementation and lubrication between clay particles cause different results for samples with different amounts of clay, use power function model to fit the curves of gradually stabilized dynamic residual strain, and develop a empirical formula, incorporating cycle stress ratio and number of cycles, for the dynamic residual strain.