渗流作用下边坡稳定性模糊评判与边坡角优化

Fuzzy judgment on slope stability and slope angle optimization under the seepage action

引入渗透率这一指标,结合其他因素对大顶铁矿露天采场边坡稳定性进行模糊评判。在评判结果满足工程稳定要求的基础上,考虑适当增加边坡角,提出变边坡角优化设计方案。选取垂直高度最大和岩体条件最为复杂的边坡面,采用FLAC程序建立边坡流固耦合数值模型,分析各方案在水渗流作用下边坡水平位移特征和总体稳定性,并基于二分法原理确定最优边坡角,对于减少剥岩量,提高矿山整体经济效益具有重要的参考意义。

A fuzzy judgment on slope stability of Dading Iron Mine was conducted after the indicator of penetra- tion being introduced and combined with other factors. On the basis of the evaluation results satisfied the engineer- ing stability requirement, we increased the slope angle appropriately and proposed slope angle optimized designs. A fluid-solid coupling numerical simulation model was established through FLAC program aiming at the slope section which has the largest vertical height and the most complex rock mass conditions. It was used to analyze the displacement charac- teristics of horizontal displacement and the overall stability of different slope designs under the function of water seepage. The best design of slope angle was determined based on the dichotomy. The above work has important reference significance in reducing the amount of stripping rock and improving the overall economic benefits of mine.