Research and Application of Pressure Relived and Permeability Enhanced Effect of Perforated Slotting Borehole on Coal
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摘要: 采用数学方法对煤层割缝钻孔的卸压增透机理进行分析,针对平宝煤矿地质条件模拟得到该煤矿最优的水力割缝高度和间距分别为0.02 m和4 m。通过现场工业性试验,对比分析了割缝钻孔和普通钻孔的瓦斯抽采情况,结果表明:30 d内割缝钻孔抽采瓦斯流量是普通钻孔的3倍,抽采瓦斯浓度为普通钻孔的2~3倍,并且割缝钻孔的瓦斯浓度能够长时间保持在80%左右;后续巷道掘进月进度也由原来的60~80 m提高至100~120 m,掘进效率提高30%~50%。该项技术能够较好解决煤层瓦斯突出难题,促进煤矿的安全高效生产。Abstract: The mechanism of pressure relieved and permeability enhanced of slotting borehole in coal seam was analyzed by mathematical method. Based on the geological condition simulation of Pingbao Coal Mine, the optimal height and spacing of hydraulic slotting were 0.02 m and 4 m respectively. Field industrial tests were carried out to compare and analyze the gas extraction situation of slotting borehole and ordinary borehole. The results show that the gas extraction volume of slotting borehole is three times of that of ordinary borehole in 30 days, and the gas extraction concentration of slotting borehole is 2 to 3 times as that of ordinary borehole, and the gas concentration of slotting borehole can be maintained at about 80% for a long time; the monthly tunneling progress of subsequent roadways is raised to a range from 100 m to 120 m, which used to be between 60 m and 80 m, the tunneling efficiency increases by 30% to 50%. This technology can solve the problem of gas outburst in coal seam and promote the safe and efficient production of coal mine.
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