“三软”煤层综采工作面覆岩运移和裂隙演化规律实验研究

Experimental study on overburden migration and fracture evolution law of “three soft” coal seam fully mechanized working-face

  • 摘要: 针对“三软”煤层综采工作面卸压瓦斯治理问题,采用物理相似模拟和UDEC数值模拟实验研究了工作面受采动影响后采场覆岩运移规律。同时,采用现场仰斜注水钻孔法和高位钻孔瓦斯抽采浓度监测法对实验结果进行验证。结果表明:在相似材料模拟实验中,对观测面刷白后,能更加清晰地观测到裂隙发育情况;相似材料模拟和UDEC模拟结果基本吻合,垮落带和断裂带最大高度分别为12和38 m,则高位钻孔最佳布孔垂距为20~26 m;现场仰斜注水表明垮落带和断裂带最大高度分别为10和39 m;现场高位钻孔瓦斯抽采浓度监测结果表明,1-2和1-3高位钻孔瓦斯抽采浓度最大,其垂距分别为24.4和20.5 m,验证了物理相似模拟和数值模拟实验方法和结果的正确性和科学性。

     

    Abstract: For the pressure relief gas governance problems of "three soft" coal seam fully mechanized working-face, a similar physical simulation and UDEC numerical simulation experiments have been conducted to research the stope fracture evolution law of the face affected by mining.At the same time, the field slating backward water injection method and the field high level borehole gas drainage concentration monitoring method were used to verify the experiment results.The results show that the fractured situation can be observed more clearly when the observation plane is whitewashed in the similar material simulation experiment, and the similar material simulation is basically consistent with UDEC simulation results.The maximum height of caving zone and fractured zone are 12 m and 38 m, respectively, the best vertical distance between the two bores of high level borehole is 20-26 m.Water injection by slating backward at field indicates the maximum height of caving zone and fractured are 10 m and 39 m, respectively.The results of field high level borehole gas drainage concentration monitoring manifests that 1-2 and 1-3 high level borehole gas drainage concentration is the maximum, which vertical distances are 24.4 and 20.5 m, respectively.It also verified the correctness and scientificity of similar physical simulation and numerical simulation experiment methods and results.

     

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