深部饱和黏土的力学性质特征

根据大量的土工试验结果，分析了深部饱和黏土力学参数(变形模量、黏聚力、内摩擦角)随埋深和液性指数的变化特征，提出了深部黏土的强度差异增大，存在强度弱面，针对深部黏土力学性质的这一现象提出了深部黏土强度的“上、下限取值法”，设计并实施了专门试验(高压入渗试验)对深部黏土的力学性质进行了试验研究，证明深部黏土与承压含水层的接触面为强度弱面，“上、下限取值法”是可行的。

Mechanics characteristics of deep saturated clay

Based on the results of a large quantity of soil tests, the variation of mechanics parameters was analyzed,such as deformation modular, cohesion and internal friction angle, of deep saturated clay with depth and relative water content (I_(l)). It was concluded that the strength difference in the deep clay was increased, and moreover,a strength weak face was formed. A upper limit and lower limit method about deep clay strength was pointed out to describe features of the deep clay strength. In addition, mechanics characteristics of deep clay were also studied by special test called as a high pressure seeping test.The special test testified that the strength weak face of the deep clay was just the interface between a thick clay layer and a artesian aquifer, and the upper limit, lower limit method was available.