饱和度对砾质土性质影响三轴试验研究

Research on influence of degree of saturation on behavior of gravelly soil in triaxial tests

对糯扎渡土石坝心墙砾质土料进行了不同饱和度条件下三轴不固结不排水剪切试验,对非饱和砾质土的应力应变及强度特性进行了研究。结果表明,相同围压下,试样的变形模量随着含水率增大而逐渐减小;试样的强度随着含水率的增加而减小;试样的粘聚力和内摩擦角均随含水率增加而线性减小,且粘聚力比内摩擦角减小幅度较明显。

The core wall material of gravelly soil of Nuozhadu earth rock dam under different degree of saturation conditions triaxial undrained shear test was carried out to research the stress - strain behav- ior of unsaturated gravelly soil. Analysis of the experimental curves shows that the deformation modu- lus of specimen decreases when water content increases under the same confining pressure; the strength of gravelly soil decreases when water content increases; cohesion and internal friction angle of specimen decreases linearly with increasing water content, and the value of cohesion decreases more obvious than the value of the internal friction angle.