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以平煤股份公司十二矿超千米埋深己14-31050采面为测试基地,基于现场原位监测以及三维数值模拟,研究了沿空留巷采动条件下千米深井煤岩采动应力特征及采动裂隙演化规律.研究结果表明:平煤超千米巷道的采动影响范围明显较浅部增大,整体影响范围约为70m左右,采动应力峰值在距离采面10~30m,钻孔应力和锚杆应力均呈现阶段式演化特征;在距采面70m时,采动裂隙分维随采面推进快速增长并保持较高水平,煤岩易出现由初始破碎带与采动裂隙贯通后形成的破碎带群.数值计算表明:千米深井的采空区两侧25m范围内以及沿空留巷充填体上方会产生应力集中,系数分别为1.43和1.65.针对平煤矿区超千米巷道,采面前方重点支护区域应确定为采面前方70m范围,特别关注区域应由浅部的15m向开采方向延伸到20~30m.研究成果可为超千米埋深的巷道支护、工程设计、安全开采和采矿技术优化等提供指导.
Based on the on-site monitoring and three-dimensional numerical simulation, a coal mine with a depth of 1000m under mining conditions of gob-side entry retaining was studied with the 14-31050 mining surface exceeding the depth of 10km buried in the No.12 Mine of Pingdingshan Stock Co., Ltd. Stress characteristics and evolution rule of mining fissure.The results show that the mining influence range of coal roadway with ultra-thousand meters of coal is obviously larger than that of shallow part, the overall influence range is about 70m, the peak of mining stress is between 10 ~ 30m , Borehole stress and rock bolt stress show the stage evolution characteristics; at the distance of 70m from the mining face, fracturing fractures of mining fractures rapidly increase with the mining face and maintain a high level, coal and rock prone to initial fracture zone and mining The fractured zone group formed after the fissure penetrated.The numerical results show that the stress concentration occurs within 25m on both sides of the goaf in km deep well and above the filling body of gob-side entry retaining, with coefficients of 1.43 and 1.65 respectively. Km roadway, the key supporting area in front of the mining face shall be determined as 70m in front of the mining face, and the special attention area shall extend from 15m in the shallow part to the mining direction to 20 ~ 30m.The research results may be roadway support , Engineering design, safe mining and mining Provide guidance on technical optimization.