西湾露天煤矿首采区东端帮边坡稳定性分析

Stability analysis of east end slope in first mining area of Xiwan Open-pit Coal Mine

针对露天煤矿开采期间的边坡稳定性分析,开采领域的相关学者及技术人员进行了多方面的研究,并对露天煤矿边坡稳定性进行了判定及优化方案的设计。本文以西湾露天煤矿为研究对象,结合东端帮实际工程地质条件,建立了边坡稳定性计算模型,并基于Slide软件分别采用简化Bishop法、Janbu法与Fellenius条分法对东端帮边坡稳定性进行计算。结果表明,稳定系数分别为0.737、0.733、0.736,得出西湾露天煤矿东端帮上部由风化岩组层构成的台阶存在滑坡危险的结论,并提出了优化方案。具体方案为调整上部风化岩组台阶高度为9 m,台阶坡面角为60°,保安平盘宽度为6 m,最终端帮稳定系数达到1.2以上,为类似条件的露天煤矿提供了借鉴。

For the slope stability during the open-pit mining,relevant scholars and technical personnel have carried out many aspects of research,and put forward the judgment method for the slope stability of the open-pit mine,and carried out the opti⁃mization design.Taking Xiwan open-pit mine as the research object,combined with the actual engineering geological condi⁃tions of the east end slope,the slope stability calculation model is established,and the simplified Bishop method,Janbu meth⁃od and Fellenius slice method based on Slide software are used to calculate the stability of the east end slope.The results show that the stability coefficients are 0.737,0.733 and 0.736 respectively,which indicates that there is a risk of landslide in the steps composed of weathered rock formations at the upper part of the east end of Xiwan open-pit mine,and the optimization scheme is put forward.The specific scheme is to adjust the height of the upper weathered rock group bench to 9m,the slope angle of the bench to 60°and the width of the security flat plate to 6m.The final stability coefficient of the end slope is more than 1.2,which provides a reference for open-pit mines with similar conditions.