基于等效M-C准则的强度折减技术分析岩质边坡稳定性

Analysis on the Rock Slope Stability with Strength Reduction Based on Equivalent Mohr-Coloumb Criterion

传统意义上的强度折减法都是基于线性的Mohr-Coloumb准则进行的,对一般土体而言,其分析结果较为可靠;然而对于应力-应变关系呈明显非线性特性的岩体材料而言,广义Hoek-Brown准则更符合实际。采用基于广义H-B准则的等效M-C准则,兼顾非线性的材料应力-应变特性和线性准则折减技术的易行性,结合效率极高的黄金分割搜索算法,计算某露天矿边坡的安全系数,并自动搜索出滑动面,从应力-应变的角度分析边坡的可能破坏模式,为后续边坡加固设计研究提供理论依据。

The traditional Strength Reduction Technique（SRT） was based on the linear Mohr-Coloumb criterion,and the analysis result is reliable for the general soil materials.However,to the rock material whose stress-strain characteristic is nonlinear,the Generalized Hoek-Brown criterion is much more accurate.In this paper,the Equivalent Mohr-Coloumb criterion was adopted,and it takes the advantage of Generalized H-B and M-C criterion into consideration.And in combination with Golden Section Search Algorithm to calculate the Safety Factor of an open pit slope,the slide surface was also searched automatically,and the possible failure mode analysis was carried out based on the stress-strain relation.All of these works provided a basis for the following slope reinforcing design.