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为考察不同的各向异性抗剪强度表达式对于数值计算结果的影响,以一个假定的位于层状岩体中的矩形地下洞室为背景,分别使用笔者和Pietruszczak各自提出的材料摩擦系数和黏聚力随方向变化的公式,进行3种工况的弹塑性二维有限元模拟,对比了围岩中的应力、位移及塑性区。结果显示,笔者提出的经验表达式与和相应的Pietruszczak一阶表达式在计算中的精度基本相当,而与Pietruszczak的二阶表达式相比有较明显的差别。
In order to investigate the influence of different anisotropic shear strength expressions on the numerical results, a hypothetical rectangular underground cavern located in a layered rock mass was used as the background. The friction coefficient and viscosity of the material proposed by the author and Pietruszczak Cohesion with the direction of the formula changes, the three conditions of elastic-plastic two-dimensional finite element simulation, compared to the surrounding rock stress, displacement and plastic zone. The results show that the accuracy of the empirical expression proposed by the author and that of the corresponding Pietruszczak first-order expression are basically the same, and there is a clear difference compared with the second-order expression of Pietruszczak.