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将块体单元法与极限分析上限法相结合,提出了岩石边坡稳定的块体单元极限分析上限法。借助于块体单元法离散计算区域,通过块体系统速度场在结构面上满足Mohr-Coulomb屈服条件、关联流动法则、速度边界条件以及块体系统虚功原理,构成求解边坡强度储备安全系数上限解的非线性规划模型,模型的求解采用复合形法。最后研究了一个岩质楔形体边坡算例和小湾水电站进水口边坡实例,通过将块体单元法上限分析计算结果与刚体极限平衡法相比较,验证了该方法的正确性。
By combining the block element method with the upper bound method of limit analysis, the upper bound method of block element limit analysis for rock slope stability is proposed. By means of the block element method, the calculated area is discretized, and the Mohr-Coulomb yield conditions, the associated flow laws, the boundary conditions of velocity and the virtual work principle of the block system are satisfied on the structural plane through the velocity field of the block system to form the safety factor for solving the slope strength reserve Upper bound solution of nonlinear programming model, the model used to solve the complex method. Finally, an example of rocky wedge slope and an example of inlet slope of Xiaowan Hydropower Station are studied. The correctness of this method is verified by comparing the upper bound of block element method with rigid limit equilibrium method.