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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。
The effect of clay content on the unconfined compressive strength and the sensitivity, the residual residual strain and the moving residual pore pressure of the sample were studied by dynamic triaxial tests on two silt clay with different clay content. The results show that the unconfined compressive peak strength of samples with high clay content is lower than that of samples with low clay content. The sensitivity of samples with high clay content is higher than that of samples with low clay content. With the increase of load, the moving residual strain and moving residual pore pressure increase continuously, and the residual residual strain difference and ratio of remodeling and original sample also increase, and the ratios are greater than their respective sensitivities. Under the same dynamic load , The residual remnants of the remolded specimens are higher than that of the original specimens, and the high residual clay strain of the clay specimens is larger than that of the clay specimens with low clay content. According to the analysis, different test results of the two kinds of clay samples resulted from the dual action of clay adhesion and lubrication in soil. Finally, the power function model was used to fit the steady residual residual strain curve, and the empirical formula of dynamic residual strain including the cyclic stress ratio and vibration frequency was established.