露天矿外排土场分布对复合边坡稳定性影响机理  

Influence Mechanism of Distribution Position of External Dumping on Stability of Composite Slope in Open-pit Coal Mine

作　　者：陈毓 CHEN Yu(China Coal Technology and Engineering Group Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤矿安全》2020年第12期288-291,共4页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2017YFC1503106)。

摘　　要：为了明确露天煤矿外排土场位置对矿坑边帮稳定性的影响程度,通过建立复合边坡的二维理论模型,使用FLAC^3D软件建立三维数值分析模型,对外排土场与矿坑边帮复合边坡进行了边坡稳定性分析;排土场与矿坑边帮距离分别为50、70、90、110 m工况条件,边坡的安全系数随着距离的增加也一直在增加,其中距离为50、70 m的模型安全系数均比较低,距离达到90 m后安全系数有了明显的提高;根据计算结果所得安全系数和模拟监测点位移数据,认为外排土场与矿坑边帮的安全距离为110 m。In order to clarify the influence of the location of the external dumping on the stability of the open-pit slope,a two-dimensional theoretical model of composite slope is established,and the formula for calculating the safety factor of end-slope stability under the action of the dumping site is derived,and the mechanism of the influence of the distance between the external dumping and the end-slope on the safety factor of the slope is expounded.In addition,a three-dimensional numerical analysis model is established by using FLAC^3D software,and the slope stability of the composite slope of the external dumping and the side slope of a mine in China is analyzed.The failure mechanism and characteristics of composite slope in open pit coal mine are expounded.By studying working conditions under the distance of 50 m,70 m,90 m,and 110 m between the dump and the side of the mine,it is found that the safety factor of the slope increases with the increase of the distance.The safety factors of the models with distances of 50 m and 70 m are relatively low.The safety factors have been improved obviously after the distance exceeds 90 m.At the same time,according to the calculated safety factors and displacement data of the simulated monitoring points,the safe distance between the dumping site and the side wall of the mine is 110 m.

关 键 词：露天煤矿 复合边坡 数值模拟 边坡稳定性 FLAC^3D 外排土场 

分 类 号：TD854.6[矿业工程—金属矿开采]