某露天铁矿采场边坡优化设计可靠度分析

根据某露天铁矿采场地质条件和开采形成的边坡形态，共选择4个典型剖面，设计了6个边坡角优化方案。采用Morgenstern-Price法计算边坡安全系数，所得安全系数均大于1.0，但极限平衡法未考虑岩土体参数的空间变异性，无法全面反应边坡的安全性。鉴于可靠性分析方法的优越性，采用蒙特卡洛模拟法进行随机模拟试验，分析各边坡设计方案所得平均安全系数与上述极限平衡法求得的安全系数相接近，但破坏概率均在可接受的破坏概率阈值之下，可靠性指标均大于可接受的可靠性指标最小值，满足工程稳定性要求。

Reliability Analysis of Slope Design Optimization in an Open Pit Iron Mine

Four typical slope sections were selected and six optimal slope angle designs were provided according to the geological conditions and the slope morphology formed by the mining operation in an open pit mine. Morgenstern-Price method was used to calculate the slope safety factor,and all slope safety factors are greater than 1. 0. But the limit equilibrium method does not consider the spatial variability of rock and soil parameters,which can not reflect the slope safety comprehensively. In light of the advantages of reliability analysis method,Monte Carlo simulation method was used to carry out the stochastic simu-lation experiments. The analysis results showed that the slope designs′average safety factor provided by the reliability analysis method were closed to that by the limit equilibrium method,but the failure probability are within the acceptable failure proba-bility threshold,and the reliability index is greater than the minimum acceptable reliability index. All the slope designs meet the engineering stability requirements.