大峰露天矿边坡稳定性分析与治理措施研究

Study on sope stability analysis and treatment measures of Dafeng open pit mine

边坡失稳破坏是露天矿山开采重大灾害之一。以大峰露天矿为背景,对终了边坡的稳定性进行研究,根据层理的分布特征,将边坡的潜在破形态分为2类:非工作帮为例的顺层滑坡与端面为例的圆弧形滑坡。采用理论分析方法,分析了影响2类边坡稳定性的主要因素有台阶高度、台阶坡面角、平台宽度,通过数值模拟对边坡潜在的破坏形态进行了验证。同时,采用正交试验分析了3种影响因素的主次顺序,确定了最优终了边坡结构参数:非工作帮终了边坡为台阶高度10 m,台阶坡面角70°,台阶平盘宽度5 m;端帮边坡为台阶高度15 m,台阶坡面角70°,台阶平盘宽度3 m。大峰露天矿最终无边坡失稳现象发生,为此类边坡稳定性维护提供一定参考价值。

Slope instability is one of the major disasters in open-pit mining.Taking Dafeng Open pit Mine as the background,the stability of the end slope was studied.According to the distribution characteristics of bedding,the potential failure forms of the slope were divided into two categories:bedding landslide with non working slope as an example and circular arc landslide with end face as an example.The theoretical analysis method was used to analyze the main factors affecting the stability of the two kinds of slopes,including bench height,bench slope angle and platform width.The potential failure form of the slope was verified by numerical simulation.At the same time,orthogonal test was used to analyze the primary and secondary order of the three influencing factors,and the optimal ending slope structure parameters were determined:the ending slope of non working side was 10 m high,the slope angle of the bench was 70°,and the width of the bench flat plate was 5 m;The side slope of the end slope was 15 m high,the slope angle of the step was 70°,and the width of the flat plate of the step was 3 m.There was no slope instability in Dafeng open pit Mine,which provided certain reference value for the maintenance of such slope stability.