重塑非饱和黏性土UU抗剪强度参数与饱和度的关系

Relation of Shear Strength Parameters with Saturation of Remolded Unsaturated Cohesive Soil

土的饱和度是基于水分状态和密度状态的一个衍生变量。存在因应水分状态变化和因应密度状态变化的两类饱和度变化过程。根据23组不同水分状态和密度状态的UU三轴压缩试验结果,讨论了重塑非饱和黏性土抗剪强度参数与饱和度的关系。数据分析表明,黏聚力和与水分状态相关的饱和度的关系是强非线性的,和与密度状态相关的饱和度的关系是准线性的。内摩擦角和与水分状态相关的饱和度的关系是强非线性的,和与密度状态相关的饱和度的关系是弱非线性的。

Saturation is derived from water content and dry density of soil. There are two patterns of varying process of saturation, one is related with variation of moisture state, other is related with density state. There are 23 groups UU triaxial compression tested with experimental specimens in six different moisture states and four density states were conducted according to five classes of surround pressure as 100, 200, 300, 450 and 600 kPa. Experimental results show that shear strength parameters of remolded unsaturated cohesive soil vary regularly in certain extent with saturation, but not available to be presented by one or two simple functions. Cohesion has a strong nonlinear relation with moisture state related saturation and a quasi-linear relation with density state related saturation respectively. Internal friction angle has a strong nonlinear relation with moisture state related saturation and a weak nonlinear relation with density state related saturation respectively.