对单样多级加荷三轴剪切试验的探讨

Study on the Multistage Loading Triaxial Shear Test of A Single Specimen

通过对硬土及软土进行单样三轴固结不排水(CU)剪切试验(简称CU三轴试验)和多样CU三轴试验,分析探讨单样多级加荷三轴剪切试验对不同土性的适用性,深入研究控制屈服应变对土抗剪强度的影响。试验结果表明,单样多级加荷三轴剪切试验对于硬土有较好的适用性;对于软土的多级加荷试验,第一级控制应变应相对较大,第二级控制控制应变应稍大,第三级控制应变应稍小。

Based on the consolidated undrained(CU) triaxial shear test of a single specimen as well as multi-specimens for hard & soft soils, this paper has discussed the applicability of the multistage loading triaxial shear test(MTT) of a single specimen to soils with different properties, and has studied on the effect of shear strength of soils due to the yield strain change. As a result, MTT of a single specimen is suit for hard soils. But for soft soils, the results show that the strain shouldbe in large value at the first and the second step whereas in small value at the third step.