非饱和土抗剪强度与含水量关系研究

STUDY ON THE RELATIONSHIP BETWEEN WATER CONTENT AND SHEAR STRENGTH OF UNSATURATED CLAY

非饱和土的含水量对其的抗剪强度有一定的影响,所以研究非饱和土的含水量与抗剪强度之间的关系有实际的工程意义。以长春重塑粉质黏土为研究对象,通过固结排水试验和不固结不排水试验,研究含水量对非饱和土的抗剪强度指标的影响。结果表明:非饱和土的抗剪强度指标受到含水量的影响,黏聚力随着含水量的增加而升高,存在一个临界含水量,当超过这个含水量时,黏聚力反之降低;内摩擦角随着含水量增加而降低,存在一个临界含水量,超过这个含水量时,内摩擦角反之升高。

The water content of unsaturated clay has an influence on the shear strength of unsaturated soil, so studying the relationship between water content and shear strength of unsaturated clay is significant for practical engineering, Remolded silty clay in Changchun was taken as the object researched, and the influence of the water content on the shear strength of unsaturated clay was studied by employing the con- solidated drained triaxial and unconsolidation undrained tests. The results show that the shear strength of unsaturated clay is affected by the water content. The cohesion increases with the increase of water content, but there is a critical water content, and when the water content exceeds it, the cohesion decreases. Additionally, the internal friction angle decreases with the increase of water content, but there is also a critical water content, when the water content exceeds it, the internal friction angle increases.