分散性土的抗剪强度特性试验研究

发布时间：2018-03-05 06:48

本文选题：分散性土　切入点：抗剪强度　出处：《岩土力学》2014年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Dispersible soil is a kind of soil with special engineering properties, which is characterized by poor impermeability, low erosion resistance and high dispersibility in pure water. The shear strength of dispersible soil under different initial conditions is studied by triaxial CU test. The results show that the stress-strain curve of dispersible soil is under small confining pressure. Under the condition of low moisture content and high dry density, the strain softening type appears, and the low hardening type or hardening type occurs when the confining pressure is high and the moisture content is high, and the cohesion force and internal friction angle decrease with the increase of moisture content. The higher the dry density is, the stronger the effect of moisture is, and the cohesion increases with the increase of dry density, the increase of cohesion is larger in low water cut condition, but smaller in high water cut condition. The angle of internal friction increases slightly with the increase of dry density.
【作者单位】：西北农林科技大学水利与建筑工程学院;
【基金】：国家自然科学基金(No.50979094) 西北农林科技大学青年学术骨干项目(No.08) 西北农林科技大学基本科研业务费(No.QN2009089)
【分类号】：TU411.7

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