“三软”煤层综采工作面覆岩运移和裂隙演化规律实验研究

发布时间：2018-07-08 18:44

本文选题：“三软”煤层 + 相似材料模拟　；参考：《煤炭学报》2017年S1期

【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]:In view of the pressure relief gas control problem in the fully mechanized coal face of "three soft" coal seam, the overburden rock migration law after the mining movement is studied by using the physical similarity simulation and UDEC numerical simulation experiment. At the same time, the experimental results are verified by the method of upside-down injection drilling and the monitoring of gas extraction concentration in high borehole. The results show that the fissure development can be observed more clearly after whitening the observation surface in the simulation experiment of similar materials, and the simulation results of similar materials and UDEC are basically consistent with each other. The maximum height of caving zone and fault zone are 12 and 38 m respectively, the optimum vertical distance of high hole distribution is 20 ~ 26 m, the maximum height of collapsing zone and fault zone is 10 and 39 m respectively, and the gas extraction concentration of high hole in the field is 10 and 39 m respectively. The monitoring results show that the concentration of gas extraction in 1-2 and 1-3 high boreholes is the highest. The vertical distance is 24.4 m and 20.5 m respectively, which verifies the correctness and scientificity of the experimental methods and results of physical similarity simulation and numerical simulation.
【作者单位】：西安科技大学安全科学与工程学院;教育部西部矿井开采及灾害重点实验室;
【基金】：国家自然科学基金科学仪器基础研究专项资助项目(51327007);国家自然科学基金资助项目(51174157)
【分类号】：TD325

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