基于Barton-Bandis非线性破坏准则的岩体强度预测

为了采用Barton-Bandis模型描述岩体特征,并将其参数应用于数值计算中,探讨Barton-Bandis参数到Mohr-Coulomb准则参数的转换,研究Barton-Bandis参数对Mohr-Coulomb参数的影响.研究结果表明:Barton-Bandis参数到Mohr-Coulomb准则参数的转换方法方便有效;随着节理粗糙系数JRC和节理压缩强度JCS的增大,Mohr-Coulomb参数粘结力c和内摩擦角φ均呈现非线性增大,可通过指数方程对其关系进行拟合;JRC的变化对粘结力的影响大于其对内摩擦角的影响;JRC对岩体剪切强度的影响大于JCS对岩体剪切强度的影响.

Strength prediction for rock mass based on Barton-Bandis nonlinear failure criterion

In order to describe the rock mass characteristic based on the Barton-Bandis model, and apply its parameters in the numerical calculation, the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters was proposed. The effects of Barton-Bandis criterion parameters on the Mohr-Coulomb criterion parameters were studied. The results show that the transfer method from Barton-Bandis criterion parameters to the Mohr-Coulomb criterion parameters is suitable and convenient. With the increase of friction coefficient JRC and compressive strength of joint JCS, the cohesion c and friction angle φ of Mohr-Coulomb parameters increase at the same time in the nonlinear form, whose relationship can be fitted by exponential equation. The variation of JRC has larger impact on the cohesion than that on the friction angle; and the impact of JRC on the shear strength of rock mass is larger than that of JCS.