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煤层回采过程中,导水裂缝带发育高度对于煤矿水和瓦斯防治具有重要意义。以潞安矿区为研究对象,采用分段注水试验和钻孔电视系统探测综放开采导水裂隙带的发育高度,对发育过程进行相似模拟和数值模拟,并就试验结果进行回归分析。结果表明:潞安矿区综放开采导水裂缝带发育高度是采高的19~21倍;采动前覆岩钻孔裂隙发育度低,采动后明显提高;工作面推进过程中覆岩裂隙发育规律呈3个阶段;采用回归模型对导水裂缝带发育高度进行预测,与实测值相比,预测结果偏高,相对误差在5%以下,绝对误差在-2.554~-2.140m。
During the process of coal seam mining, the development height of the water-conducting fracturing zone is of great significance for the prevention and control of water and gas in coal mines. Taking Lu’an mining area as the research object, the sub-section water injection test and drilling television system were used to detect the developmental height of water-conducting fractured zone in fully mechanized caving mining. Similar simulation and numerical simulation of the development process were carried out and the regression analysis was carried out. The results show that the development height of hydraulic conductivity fracturing zone in fully mechanized caving mining in Luan mining area is 19-21 times higher than mining height; the development degree of borehole fractures before mining is low and the fractures obviously increase after mining; The developmental rule was in three stages. The regression model was used to predict the developmental height of the aqueduct. The predicted results were higher than the measured values, with relative errors less than 5% and absolute errors between -2.554 and -2.140 m.