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利用GDS三轴仪对某深基坑周边主动区粉质黏土进行了平面应变条件下的k0固结侧向卸荷试验和常规三轴压缩试验,试验结果表明:两种应力路径试验的应力–应变关系曲线均呈双曲线型,均表现为非线性,且全部呈应变硬化曲线;卸荷破坏主应力差均小于加载破坏主应力差;卸荷试验得到的土体平均侧向应变、平均轴向应变均小于加荷试验。
The K0 consolidation lateral unloading test and the conventional triaxial compression test of the silty clay in the active area around a deep foundation pit were performed by GDS triaxial apparatus. The test results showed that the stress of the two stress path tests – The strain curves are all hyperbolic, all nonlinear, and all show strain-hardening curves; the unloading failure main stress difference is smaller than the loading failure main stress difference; the soil average lateral strain, average axis obtained by the unloading test The strain is less than the loading test.