模拟基坑开挖过程的三轴试验研究

根据基坑开挖的特点,对常规三轴试验仪器进行了改造。在此基础上,利用三轴剪切试验对基坑开挖过程中土体的侧向卸荷过程进行模拟,并与常规三轴试验结果进行了对比分析,研究了侧向卸荷过程对土体抗剪强度指标产生的影响。试验结果表明,经过侧向卸荷过程的土样抗剪强度指标与常规三轴试验结果明显不同,说明卸荷过程对土体的抗剪强度指标具有较大影响。

Study on Triaxial Tests for the Simulation of Excavation Process

Based on the characteristics of the excavation of foundation pit, the shear apparatus for the normal triaxial tests is improved. The process of the lateral unloading during the excavation is simulated by the triaxial tests, and the testing results are compared with that from normal triaxial tests. Owing to the lateral unloading the influence to the parameters of shear strength is studied. The testing results show that the parameters of the shear strength of soils after the lateral unloading are different from the parameters obtained by the normal triaxial tests, which indicates that the unloading process has a high influence to the parameters of the shear strength of soil.