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根据基坑开挖的特点,改进常规三轴试验仪器的控制程序。并以此为基础,利用三轴仪对基坑开挖过程中土体的K_0固结-侧向卸荷过程进行模拟,同时与常规三轴压缩试验结果进行对比分析,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压缩试验结果明显不同,特别对于深层土,抗剪强度指标下降急剧,说明卸荷过程对土体抗剪强度指标有较大影响。
According to the characteristics of excavation, improve the control routine of triaxial test equipment. Based on this, the triaxial apparatus is used to simulate the process of unloading and unloading of soil in the process of excavation of the foundation pit. At the same time, compared with the conventional triaxial compression test results, the lateral unloading Influence of Process on Shear Strength Index of Soil. The test results show that the shear strength of soil samples after lateral unloading process is obviously different from that of conventional triaxial compression test. Especially for deep soil, the shear strength index drops sharply, which indicates that the unloading process has significant influence on the shear strength index Have a greater impact.