基于MatDEM的露天转地下房柱法开采覆岩与边坡失稳规律研究  

Study on the Law of Overlying Rock and Slope Instability in Open-pit to Underground Room-pillar Mining Based on MatDEM

作　　者：耿加波 兰祥 李小双 唐世斌 周令剑[1] GENG Jiabo;LAN Xiang;LI Xiaoshuang;TANG Shibin;ZHOU Lingjian(School of Emergency Management and Safety Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China;School of Urban Construction,Changzhou University,Changzhou 213000,China)

机构地区：[1]江西理工大学应急管理与安全工程学院,江西赣州341000 [2]中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山243000 [3]常州大学城市建设学院,江苏常州213000

出　　处：《金属矿山》2024年第8期177-182,共6页Metal Mine

基　　金：中国博士后科学基金面上项目(编号:2022M722924);江西省自然科学基金项目(编号:20232BAB214035);江西省研究生创新专项资金项目(编号:YC2023-S673)。

摘　　要：随着露天矿山转入地下开采,研究二次扰动后覆岩与边坡系统的稳定性显得尤为重要。以江西某大型露天转地下房柱法开采矿山为研究背景,使用MatDEM离散元软件建立了数值模拟模型,计算并分析了房柱法开采扰动下覆岩与露天边坡的位移、应力以及动能等参数的变化规律。结果表明:随着开采空区形成,采场覆岩形成了以开采区域为中心的椭圆形应力降低区,该区域岩层发生了显著的破坏,并且沿着开采推进方向移动。采场顶板的应力变化随开采进程表现出应力集中—应力增大—应力重构—应力平衡4个阶段。地下开采使得采场覆岩以及露天边坡产生了较大位移,覆岩的岩移面积和岩移动能均较边坡的更大,覆岩的变化表现出更加敏感的特性。研究结果可以为相似矿山的开采设计提供借鉴。As open-pit mines turn into underground mining,it is particularly important to study the stability of overlying rock and slope system after secondary disturbance.Taking a large open-pit to underground room-pillar mining mine in Jiangxi Province as the research background,a numerical simulation model was established using MatDEM discrete element software to calculate and analyze the displacement,stress and kinetic energy of overlying rock and open-pit slope under the disturbance of room-pillar mining.The results show that with the formation of the mined-out area,the overlying rock of the stope form an elliptical stress reduction zone centered on the mining area.The rock strata in this area have been significantly damaged and moved along the mining direction.The stress change of the stope roof shows four stages of stress concentration-stress increase-stress reconstruction-stress balance with the mining process.The underground mining makes the overlying rock and the open-pit slope of the stope have a large displacement.The rock movement area and rock movement energy of the overlying rock are larger than those of the slope,and the change of the overlying rock shows more sensitive characteristics.The research results can provide reference for the mining design of similar mines.

关 键 词：二次扰动 露天转地下开采 覆岩 边坡 MatDEM 

分 类 号：TD325[矿业工程—矿井建设]