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利用MTS 815.03岩石试验机对试件进行三轴压缩试验,采用DISP声发射测试系统进行声发射数据收集,并对含陡倾角软弱结构面的岩体试件和岩石试件进行试验对比.两种试件随围压的增加强度逐渐增加,破坏由脆性向延性转变;岩体试件总是沿结构面滑移破坏,岩石试件为剪切破坏.随着围压的增加,两种试件的弹性模量、变形模量、峰值应变和峰值强度增加;岩体试件弹性模量、变形模量值和峰值强度低于岩石试件,而峰值应变高于岩石试件.岩体试件内摩擦角小于岩石试件,而黏聚力大于岩石试件.随围压的增加,两种试件在峰值应力阶段声发射事件远高于其他阶段,而岩体试件声发射事件集聚量远远高于岩石试件.研究结果表明软弱结构面的存在降低了岩体的力学性质,因此在高放废物地质处置库选址时结构面发育特征是需要考虑的关键因素.
The MTS 815.03 rock test machine was used to carry out triaxial compression tests on the specimens, and the acoustic emission data were collected using the DISP acoustic emission test system, and the rock specimens and rock specimens with steeply dipping soft structures were tested. The strength of specimen increased with the increase of confining pressure, and the failure changed from brittleness to ductility. The rock specimen always slipped along the structural plane and the rock specimens were damaged by shearing. With the increase of confining pressure, The elastic modulus, deformation modulus, peak strain and peak strength increase.The elastic modulus, deformation modulus value and peak strength of the rock specimen are lower than those of the rock specimen, but the peak strain is higher than that of the rock specimen. The internal friction angle is smaller than that of the rock specimen and the cohesive force is larger than that of the rock specimen.With the increase of the confining pressure, the acoustic emission events of the two specimens are much higher than those of the other stages in the peak stress stage, Which is much higher than that of rock specimen.The results show that the existence of weak structural plane reduces the mechanical properties of rock mass, so the structural surface development characteristics of the geological repository of high level radioactive waste are the key factors to be considered.