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以锦屏二级水电站为例,通过MTS815岩石与混凝土高温高压及破坏力学试验系统对引水隧洞大理岩做了不同围压下的三轴压缩试验,利用最小二乘法对Hoek-Brown和幂函数型Mohr岩石经验强度准则进行回归分析和比较。试验结果表明:高围压力作用下的深部岩体强度特性呈现明显的非线性特性,Hoek-Brown强度准则对三轴试验数据拟合程度较高,并能反映岩体质量对强度的影响,描述深部岩体的力学行为更具指导性。
Taking Jinping No.2 Hydropower Station as an example, the triaxial compression tests of marble at diversion tunnel under different confining pressures were carried out by MTS815 high temperature and high pressure and failure mechanics test system of rock and concrete. The least squares method was used to study Hoek-Brown and power function type Mohr rock empirical strength criteria regression analysis and comparison. The experimental results show that the strength characteristics of deep rock mass under high confining pressure have obvious nonlinear characteristics, and the Hoek-Brown strength criterion has a higher fitting degree to triaxial test data and can reflect the influence of rock mass on strength. The description The mechanical behavior of deep rock mass is more directive.