砂黏土变形与强度特性的大型三轴试验研究

Research on deformation and strength behavior of sandy clay based on large-scale triaxial tests

通过大型三轴试验,对不同压实度及不同加筋条件下砂黏土的应力应变特性、抗剪强度进行了对比分析,探讨了试验现象的内在机理。结果表明,高压实度低围压下应力应变关系呈微软化型,低密实度及高围压下呈硬化型,黏聚力随压实度的提高呈指数增长,内摩擦角变化不明显;加筋机理符合"准黏聚力理论"。

The stress-strain relationship and strength of sandy clay under different degree of compaction and reinforcement are analyzed detailedly.At the same time,the inherent mechanism of experimental phenomena is discussed.Test results indicate that under high compaction degree and low confining pressures sandy clay are characterized by strain softening,while under high confining pressures or low compaction degree they exhibit strain hardening,cohesion grows at an exponential rate along with the increase of compaction degree,internal friction angle does not change significantly.The reinforcing mechanism of the reinforced soil mixture is in compliance with the ＂quasi cohesive force＂ theory.