露天矿端帮采场边坡变形失稳特征与支撑煤柱稳定性判别方法  

Deformation and instability characteristics of slope and stability discrimination method of supporting coal pillars for end-slope mining field in open-pit mine

作　　者：丁鑫品[1,2] DING Xinpin(China Coal Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Ecological Environment Technology Co.,Ltd.,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工生态环境科技有限公司,北京100013

出　　处：《煤矿安全》2022年第3期229-235,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51774184);中国煤炭科工集团有限公司重点资助项目(2018-2-ZD007,2019-ZD004)。

摘　　要：针对端帮煤开采引起的端帮采场边坡变形失稳问题,以我国鄂尔多斯地区露天矿端帮煤开采工程实践为背景,建立近水平条件下端帮采场边坡岩体移动破坏三维数值分析模型,模拟再现了煤层采出-采硐群形成-巷间煤柱破坏-边坡变形破坏全过程,揭示了端帮采场支撑煤柱与边坡岩体的移动破坏特征,探明了边坡发生变形失稳的关键部位和触发条件;在特征规律研究的基础上构建了端帮采场支撑煤柱承载模型,提出了基于尖点突变理论与安全系数评价法的支撑煤柱稳定判别方法。工程应用结果表明:该方法可在保证边坡稳定的前提下进一步提高端帮压煤回采率至60%以上。Aiming at the end slope deformation and instability caused by end slope coal mining,this paper is based on the mining engineering practice of end slope coal mining of open-pit mine in Ordos area of China,a three-dimensional numerical analysis model for rock mass movement failure of the end-slope mining field which is under near-horizontal condition is established,the whole process of“coal seam mining-formation of mining cave group-failure of support coal pillars-instability of slope rock mass”,the characteristics of movement and failure of coal pillar and rock mass of slope are revealed,the key positions and trigger conditions of slope deformation and instability are proved.Based on the study of characteristic law,the bearing model of supporting coal pillars in end-slope mining field is constructed,based on the theory of sharp point mutation and safety factor evaluation method,a method to judge the stability of supporting coal pillars is proposed.The engineering application results show that this method can further improve the recovery rate of end slope pressed coal to more than 60%on the premise of ensuring slope stability.

关 键 词：露天矿端帮采场 端帮压煤开采 边坡稳定 支撑煤柱 判定准则 

分 类 号：TD824.7[矿业工程—煤矿开采]