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为了研究深部隧洞或地下厂房围岩在三向应力状态下的强度特性,开展玄武岩和片岩原位真三轴卸载试验,基于Mohr-Coulomb强度准则和Mogi强度准则,探讨考虑中间主应力影响的岩体强度参数取值问题。分析结果表明:(1)对于玄武岩和片岩原位真三轴试验,采用Mohr-Coulomb强度准则的回归方程满足显著性水平?=0.05的检验要求,采用Mogi强度准则的回归方程则可满足显著性水平?=0.01的检验要求,因此采用Mogi强度准则拟合现场岩体真三轴试验结果更加可靠;(2)考虑中间主应力影响的Mogi强度准则确定的岩体抗剪强度参数?值比忽略中间主应力影响的Mohr-Coulomb强度准则确定的?值高约6%,但是Mogi强度准则确定的岩体抗剪强度参数c值,则比Mohr-Coulomb强度准则确定的c值低约60%。
In order to study the strength characteristics of surrounding rock in deep tunnel or underground powerhouse in three-dimensional stress state, in-situ true triaxial unloading test of basalt and schist was carried out. Based on the Mohr-Coulomb strength criterion and Mogi strength criterion, the rock considering the effect of intermediate principal stress Body strength parameter value problem. The results show that: (1) For the true triaxial tests of basalt and schist, the regression equation using the Mohr-Coulomb strength criterion meets the significance level? = 0.05, and the regression equation using the Mogi strength criterion can satisfy the significance So the Mogi strength criterion is more reliable for fitting the true triaxial test results of in-situ rock mass. (2) The value of shear strength parameter of rock mass determined by the Mogi strength criterion considering the effect of intermediate principal stress is negligible The Mohr-Coulomb strength criterion affected by the intermediate principal stress is about 6% higher, but the c value determined by the Mogi strength criterion is about 60% lower than the c value determined by the Mohr-Coulomb strength criterion.