论文部分内容阅读
分散性土是一种具有特殊工程性质的土,其典型的性质为抗渗性能差,耐冲蚀能力低,在纯水中具有很高的分散性。目前,人们对于分散性土的研究主要集中在鉴定、抗渗和改良等方面,而对其抗剪强度特性的研究很少。采用三轴CU试验研究不同初始条件下分散性土的抗剪强度特性。结果表明:分散性土的应力-应变曲线在小围压、低含水率和高干密度的状态下呈应变软化型,在围压较大、含水率较高的情况下呈弱硬化型或硬化型;黏聚力和内摩擦角均随含水率的增大而减小,并且干密度越大受水分影响越强烈;黏聚力随干密度的增大而增大,在低含水条件下,黏聚力的增幅较大,而在高含水条件下,黏聚力的增幅则较小;内摩擦角随干密度的增大有少量增大。
Disperse soil is a kind of soil with special engineering properties. Its typical properties are impermeability, low erosion resistance and high dispersibility in pure water. At present, the research on dispersible soils mainly focuses on the aspects of identification, impermeability and improvement, but few studies on their shear strength properties. The triaxial CU test is used to study the shear strength characteristics of dispersive soils under different initial conditions. The results show that the stress-strain curve of the dispersive soil shows strain-softening behavior under low confining pressure, low water content and high dry density, weakly hardening or hardening under the condition of large confining pressure and high water content The cohesion and internal friction angle both decreased with the increase of water content, and the greater the dry density was, the stronger the influence was. The cohesion increased with the increase of dry density. Under low water content, Cohesion increased greatly, while in high water conditions, the increase of cohesion is smaller; internal friction angle increases with a small increase in dry density.