岩石流变扰动效应三轴压缩试验研究
Triaxial load test study on the perturbation effect of rock rheology
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摘要: 为了研究三向应力状态下扰动荷载引起的围岩流变变形规律, 在岩石流变扰动效应单轴压缩试验研究的基础上, 利用自主研发的岩石流变扰动效应三轴试验系统, 选取红砂岩进行流变扰动效应三轴压缩试验, 分析不同应力状态下流变扰动变形规律。试验结果表明:随着围压增大, 各级流变变形量有所下降, 长期强度增大, 流变变形破坏滞后, 破坏变形量有所增加;在进入扰动敏感区后, 流变变形速率增大, 变形不可恢复。最后, 根据试验结果得出不同应力状态下岩石累计扰动变形量与累计扰动能量之间的本构方程。Abstract: To study the law of rheological deformation of surrounding rock caused by disturbance load under three stress state, the law of rheological deformation under different stress states was investigated in a red sandstone triaxial load test on the perturbation effect of rock rheology using a rock rheological perturbation effect triaxial test system.The results show that with the confining pressure increasing, the rheological deformations at all levels decrease, the long-term strength increase, the deformation of the rheological deformation lag behind, and the deformation damage increases.After entering the disturbance sensitive area, the rheological deformation rate increases and the deformation cannot be restored.According to the experimental results, the constitutive equations between cumulative disturbance and cumulative disturbance energy under different stress states are obtained.