基于双折减系数法的楔形体稳定性分析

Stability analysis of wedge based on double reduction factor method

为了研究抗剪强度参数对楔形体边坡稳定性的影响,基于Hoek等提出的楔形体极限平衡法,对楔形体进行双折减系数法分析,提出了折减系数增幅比,分析了内摩擦角和黏聚力对楔形体稳定性的影响程度.利用可靠度理论,将黏聚力和内摩擦角的方差作为单一变量,分析参数的方差对可靠性指标的影响,验证了双折减系数法的可靠性.运用双折减系数法对比分析了5种不同高度和不同容重的楔形体稳定性.结果表明:内摩擦角对坡体稳定性的影响程度要比黏聚力大,内摩擦角对坡体的稳定性起着决定性作用,因此可以将双参数折减分析中内摩擦角的折减系数值作为楔形体的稳定性系数.

In order to study the influence of shear strength parameters on the stability of the wedge slope,The wedge was analyzed by double reduction factor method based on limit equilibrium method of wedge by Hoek.Amplification ratio of reduction factor was proposed,and the effect of internal friction angle and cohesion on the stability of the wedge body was analyzed.The variance of the cohesion and internal friction angles was regarded as a single variable to study the effects of variance of parameters on reliability index by using reliability theory.The reliability of the double reduction factor method was verified.The stability of wedges with five different heights and five different bulk densities was contrasted.The results show that the influence of friction angle on slope stability is greater than cohesion.The stability of slope is dominated by the friction angle,so the reduction value of friction angle in double strength reduction analysis can be regarded as the stability factor of wedge.