烧变岩含水层下煤层开采导水断裂带发育规律研究
Study on development law of water conducting fracture zone in coal seam mining under burnt rock aquifer
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摘要: 为研究新疆阿艾矿区煤层开采导水断裂带发育规律，选取某煤矿1013工作面为研究对象，采用数值模拟、井下分段压水探测及理论计算相结合的方法，分析了煤层开采导水断裂带发育高度。结果表明：煤层开采后工作面周边出现应力集中现象，应力主要分布在距离煤壁0~20 m的煤岩柱上，同时采空区上方顶板岩体内形成减压区，最大减压区位于采空区中心线位置；随着开采距离的增加，导水断裂带发育高度逐渐增高；数值计算得到的导水断裂带发育最大高度为53.50 m，裂采比为16.72；采用井下分段压水方法探测了1013工作面导水断裂带发育高度，得到测试钻孔处最大导水断裂带高度为50.08 m，裂采比为15.65倍；采用经验公式计算得到导水断裂带发育高度分别为42.30、45.78 m，裂采比分别为13.22、14.31倍，3种方法得到的导水断裂带发育高度较为接近，证明研究结果具有一定可靠性。Abstract: In order to study the development law of water conducting fracture zone in coal seam mining in A’ai Mining Area, Xinjiang, 1013 working face of a coal mine is selected as the research object. The development height of water conducting fracture zone in coal seam mining is analyzed by the combination of numerical simulation, underground segmented water pressure detection and theoretical calculation. The results show that the stress concentration phenomenon appears around the working face after coal seam mining, and the stress is mainly distributed on the coal pillar 0-20 m away from the coal wall. A pressure relief zone is formed in the roof rock mass above the goaf, and the maximum pressure relief zone is located at the center line of the goaf. With the increase of mining distance, the stress gradually increases, and the development height of water conducting fracture zone gradually increases. The maximum development height of water conducting fracture zone obtained by numerical calculation is 53.50 m, and the fracture mining ratio is 16.72. The development height of water conducting fracture zone in 1013 working face is detected by underground segmented water pressure method. The maximum height of water conducting fracture zone is 50.08 m and the fracture mining ratio is 15.65 times. According to the empirical formula, the development height of water conducting fracture zone is 42.30 m and 45.78 m respectively, and the fracture mining ratio is 13.22 times and 14.31 times respectively. The development height of water conducting fracture zone obtained by the three methods is close, which proves that the results are reliable.
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