母杜柴登煤矿导水裂隙带发育高度探测分析

Detection and analysis of development height of water-conducting fracture zone in Mudu Chaideng Coal Mine

煤层开采后,上覆岩层导水裂隙带高度的确定对于顶板水害防治、防水安全煤岩柱留设、水体下采煤均具有重要的技术指导意义。根据母杜柴登煤矿30202工作面开采技术条件与岩石力学参数,采用经验公式解析计算、钻探实测、井下电视、超声成像、数值模拟等多种方法对导水裂隙带高度进行了分析研究。结果表明,工作面开采后,导水裂隙带发育最大高度预计为122.57 m,裂采比为25.4。经验公式与数值模拟、实测结果相差较大,表明经验公式并不适用于该条件下的导水裂隙带高度确定。针对呼吉尔特矿区地质及开采条件,总结形成了适一套导水裂缝带探查方法和体系。

After coal seam mining,the determination of the height of the water-conducting fracture zone of the overlying strata has important technical significance for the prevention and control of water damage in the roof,the retention and establishment of the waterproof safe coal pillar,and the coal mining under water body.According to the mining technical conditions and rock mechanics parameters of No.30202 working face in Mudu Chaideng Coal Mine,the height of the water-conducting fracture zone was analyzed and studied by several methods,such as empirical formula analytical calculation,drilling measurement,downhole TV,ultrasonic imaging and numerical simulation.The results show that the maximum development height of the water-conducting fracture zone is estimated to be 122.57 m and the fracture/production ratio is 25.4.There is a significant difference between the empirical formula and the numerical simulation and measured results,indicating that the empirical formula is not suitable for determining the height of the hydraulic fracture zone under this condition.According to the geology and mining conditions of Hojilt mining area,a suitable exploration method and system for water-guided fracture zone are summarized and formed.