易滑端帮掏槽式开采方案及端帮稳定性

露天煤矿端帮边坡的稳定性情况是影响其下部煤炭资源回收的重要因素,既保证端帮边坡稳定又尽大限度地回收端帮边坡下的煤炭资源,符合露天煤矿安全生产和经济高效的发展目标。为解决露天煤矿易滑端帮下的煤炭资源回收问题,基于靠帮开采理论的时效边坡基础,提出了掏槽式靠帮开采的新方法,给出了垂直和平行2种不同形式的端帮掏槽方案,分析了掏槽宽度确定的基本方式。以我国南方某露天煤矿为例,利用FLAC3D对不同掏槽宽度下的端帮进行了边坡稳定性分析。结果表明:垂直端帮掏槽方案的端帮边坡稳定性随掏槽宽度的增大而减小,但掏槽式靠帮开采相比全宽靠帮开采,可以有效降低边坡失稳的风险,能够有效回收易滑端帮残煤,其稳定性分析方法也在一定程度上完善了时效边坡的相关理论。

Cutting Mining Plan and Stability Analysis of Easily-sliding End-slope

The end-slope stability of surface coal mine is the main influencing factor of affecting the coal recovery beneath the end-slope.Both of ensuring end-slope stability and recovering coal resources beneath end-slope to the great limit meet the development goals of safety production and economic efficient of surface coal mine.In order to solve the problem in recovering coal resources of easily-sliding end-slope in open-pit mine，and based on the theory of timeliness and steep end-slope mining，two new mining methods of cutting steep end-slope in vertical and parallel were proposed.Basic modes of determining cutting end-slope width were also analyzed.Taking one surface coal mine in the south of our country for example，end-slope stability with different width of cut mining were analyzed by using FLAC3D numerical simulation software.The result showed that stability of cutting steep end-slope in vertical decreases with cutting width increasing，and the cut steep end-slope mining can greatly reduce the risk of slope instability and effectively recover residual coal resources of easily-sliding end-slope compared with the all-width steep end-slope mining.The analysis of slope stability improved the related theory of timeliness end-slope mining to a certain extent.