基于双强度折减法的顺层岩质边坡稳定性分析

Stability Analysis of Bedding Rock Slope Based on Double Strength Reduction Method

利用极限平衡法,对顺层岩质边坡进行双强度系数折减分析,提出了折减系数增幅比,根据增幅比确定抗剪强度折减原则,当坡体达到极限状态时确定其极限折减系数。分别以坡体的张拉裂缝深度和充水深度为单一变量,对比分析坡体稳定性发生变化时内摩擦角和黏聚力对其影响程度,最后根据双强度折减分析中极限折减系数定义坡体权重安全系数。研究表明:双强度折减法能够考虑内摩擦角和黏聚力对坡体的影响程度,对顺层岩质坡体进行双参数折减分析,最终定义双参数折减中内摩擦角的折减系数值为坡体安全系数,该结果更符合实际工程,能够为同类问题提供参考。

With the limit equilibrium method,the bedding rock slopes were analyzed by double strength reduction method,and the amplification ratio of reduction coefficient was proposed.According to the principle that the shear strength reduction was determined by the amplification ratio,the limit reduction coefficient was obtained when the slope reached the limit state.Taking the depth of tension crack and the depth of water filling as a single variable respectively,the influence degree of internal friction angle and cohesive force on the stability of rock slope was compared and analyzed when the slope stability changed.Finally,the weighted safety coefficient of slope was defined by limit reduction coefficient in the double strength reduction method.The results show that:the influence degree of internal friction angle and cohesive force on rock slope can be taken into account by the double strength reduction method.The double parameter reduction analysis is carried out on the bedding rock slope,and the reduction coefficient of the internal friction angle in double parameter reduction is defined as the slope safety coefficient.This result is more in line with the practical engineering,and can provide reference for the same kind of problems.