基于Mohr-Coulomb准则的球形洞室围岩应变软化弹塑性分析
Journal of China Coal Society(2014)
Abstract
通过用一系列的塑性流动与脆性跌落近似逼近峰后应变软化过程,将开挖球形洞室引起的塑性变形区划分为k个同心球壳.假定各球壳内岩体均质且各向同性,采用Mohr-Coulomb准则和非关联流动法则对受静水压力球形洞室围岩的应力和变形进行理论计算.由各球壳内岩体属性表征点建立岩体再破坏的补充方程,得到了围岩塑性半径求解方程组.通过算例验证了方法的合理性.最后,考虑岩体进入峰后阶段后,变形参数也随之劣化,讨论了弹性模量线性劣化对洞壁位移、软化半径和破裂半径的影响.
MoreKey words
hydrostatic stress , Mohr-Coulomb criterion , strain-softening , elastoplastic analysis , deformation modulus degradation,spherical cavity
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