深部金属矿山崩落区沉降分析

Analysis of Settlement in Caving Area of Deep Metal Mine

金属矿山采用崩落法开采形成从开采阶段至地表的崩落区,崩落区岩体在地下开采扰动作用下累积应变进而引起崩落区上方地表变形等问题,对矿山的安全生产构成极大威胁。以狮子山铜矿深部开采为背景,研究深部金属矿山崩落区沉降对矿山的整体影响。利用HyperMesh软件构建狮子山矿崩落区数值模型,采用大型有限元软件LS-DYNA计算崩落区围岩体在静力条件下形变及崩落区上方地表沉降。数值模拟结果表明,静力作用下崩落区围岩体产生应力集中,应力集中程度随深度的增加而增加。根据地表沉降数值模拟结果,得到了狮子山矿崩落区上方易于发生地表沉降位置并预测了沉降值范围。研究成果可为采用崩落法矿山预测崩落区围岩形变、地表沉降及矿山安全生产提供参考。

Metal mines adopt caving mining to form a caving area from the mining stage to the surface.The accumulated strain of the rock mass in the caving area caused by underground mining disturbance causes the surface deformation above the caving area,which poses a great threat to the safety production of the mine.Taking the deep mining of Shizishan Mine as the background,this paper studies the overall influence of the subsidence of the caving area of the deep metal mine on the mine.The HyperMesh software is used to build the numerical model of Shizishan copper mine caving area,and large finite element software LS-DYNA is used to calculate the deformation of surrounding rock and the surface settlement above the caving area under static conditions.The numerical simulation results show that the stress concentration occurs in the surrounding rock mass of the caving area under the static action,and the degree of stress concentration increases with the increase of the depth.According to the numerical simulation results of surface subsidence,the location of surface subsidence above the caving area of Shizishan mine is obtained,and the range of subsidence value is predicted.The research results can provide reference for the prediction of surrounding rock deformation,surface settlement and mine safety production in the caving area.