平朔东露天矿端帮采煤区边坡稳定性分析与监测方案

Slope stability analysis and monitoring scheme of end slope mining area in Pingshuo East Open-pit Mine

为分析平朔东露天煤矿端帮采煤区边坡稳定性,以DB-01、DB-02、DB-03等3个典型边坡剖面为研究对象,选取了合理的边坡稳定性安全储备系数与岩土体物理力学参数,基于极限平衡与有限先强度折减原理进行边坡稳定性分析,确定了各边坡开采到界的稳定系数均满足安全系数规范要求,并提出了端帮采煤区边坡监测治理措施。结果表明:平朔东露天煤矿端帮到界后的稳定系数均在1.2以上,到界端帮处于稳定状态,可进一步实施端帮采煤机开采;确定的4#煤的采硐高度为5 m、宽度为3.3 m,煤柱宽度为5 m;确定的9^(#)煤的采硐高度为5 m、宽度为3.3 m,煤柱宽度为6 m;端帮采煤机开采区的稳定性达到1.1以上,满足安全储备要求。

In order to analyze the slope stability in the end slope mining area of Pingshuo East Open-pit Coal Mine,the article selectes three typical slope profiles,DB-01,DB-02 and DB-03 as the research objects,and selectes the reasonable slope stability safety reserve coefficients and physical and mechanical parameters of the rock and soil.Based on the principles of limit equilibrium and finite initial strength reduction,we conduct slope stability analysis and determine that the stability coefficients of each slope at the mining boundary meet the safety factor specification requirements and present the measures for monitoring and controlling the slopes of the end slope coal mining area.The results show that the stability coefficients of the end slope of Pingshuo East Open-pit Coal Mine are all above 1.2 after reaching the boundary,and the end slope is in a stable state,which can be further implemented by the end face coal mining machine.The article determines that the height and width of the mining tunnel for coal seam 4 are 5 m and 3.3 m,and the width of the coal pillar is 5 m,and the height and width of the mining tunnel for 9 coal seams are 5 m and 3.3 m,with a coal pillar width of 6 m.The stability of the mining area of the end slope shearer reaches 1.1 or above,meeting the safety reserve requirements.