露天煤矿端帮单车道运输设计研究

Study on single-lane transportation design of open-pit coal mine end slope

为了最大限度回采露天煤矿端帮边坡压覆资源,基于极限平衡理论和端帮超前内排技术基本原理,应用SLOPE/W软件分析双车道改单车道运输设计对端帮整体边坡和局部边坡影响,分阶段、岩性研究了单车道循环运输条件下露天煤矿端帮最优边坡形态。研究结果表明:合理优化单车道循环运输位置,在保证端帮整体和局部边坡稳定情况下,能够显著提高煤炭资源回采率;在不超初步设计情况下,与原研究设计相比,通过优化端帮边坡设计,在实行单车道循环运输基础上,可提高端帮整体边坡角4°,提高端帮局部边坡角5°,可多采出煤炭资源300.4万t;与端帮边坡上双车道运输平盘相比,基于不同阶段端帮边坡单车道设计,可创造经济效益非常显著。

In order to maximize the recovery of the overburden resources of the end slope in open-pit coal mines,based on the basic principles of limit equilibrium theory and the advanced inner drainage technology of the end slope,SLOPE/W software was applied to analyze the impact of single lane transportation on the overall and local end slope.The optimal slope shape of the end slope in open-pit coal mines under the condition of single lane circular transportation was studied by stages and lithology.The research results show that reasonably optimizing the position of single lane cyclic transportation significantly improves the coal resource recovery rate under the condition of ensuring the overall and local slope stability of the end slope.Under the condition of not exceeding the preliminary design,compared with the original research design,by optimizing the design of the end slope and implementing single lane cyclic transportation,the overall slope angle of the end slope can be increased by 4°,and the local slope angle of the end slope can be increased by 5°.Implementing single lane cyclic transportation can extract an additional 3.04 million tons of coal resources.Compared with the double lane transportation flat plate on the end slope,the single lane design based on different stages of the end slope can create significant economic benefits.