基于离散元UDEC数值模拟对上行开采可行性研究与应用

Feasibility study and application of uplink mining based on numerical simulation of discrete element UDEC

慈林山煤矿在生产过程中,由于开拓原因,先局部开采下部煤层15号煤层,导致了其上覆岩层产生移动、变形,可能对上部未开采的9号煤层及其顶底板造成一定的影响,为分析慈林山煤矿上行开采的可行性,以慈林山煤矿的9号煤层为工程背景,采用UDEC数值试验系统,建立煤层开采的数值计算模型,动态模拟分析煤层工作面将经过非蹬空区域、进入蹬空区域、处于蹬空区域、出蹬空区域、非蹬空区域5个阶段。分析得出当煤层工作面未进入和出蹬空区域时,工作面基本不受15号煤层开采影响;当刚进入蹬空区域时,应力增大,对顶底板容易造成破坏,在此阶段应适当加强支护措施;当工作面处于蹬空区域时,工作面的推进较为平稳;当工作面推出采空区时,容易出现轻微台阶下沉。分析认为9号煤层可进行开采,并进行了工业性实践。通过对煤层正常开采时的矿压数据进行监测分析,表明该围岩压力满足矿井的正常生产需要。

CiLin mountain coal mine in the process of production,due to pioneering reasons,mining the lower coal seam No.15 coal seam,led to the upper layer movement,deformation,may affect the upper not mined No.9 coal seam and the influence of roof,CiLin mountain coal mine for analyzing the feasibility of CiLin mountain coal mine with No.9 coal seam for engineering background,using UDEC numerical test system,establish a numerical calculation model of coal mining,dynamic simulation analysis of coal seam face through the push empty area,into the empty area,in the empty area and empty area five stages.The analysis shows that when the coal seam working face is not in and out of the empty area,the working face is basically free from the No.15 coal seam mining;when entering the empty area,the stress increases,causing damage to the top floor,the supporting measures should be strengthened;when the working face is in the empty area,slight step subsidence.The analysis shows that No.9 coal seam can be mined and has industrial practice.Through the monitoring and analysis of the ore pressure data during the normal mining of coal seam,it is shown that the surrounding rock pressure meets the normal production needs of the mine.