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以沙曲矿为研究背景,依据工作面覆岩采后垮落形成的采动椭抛带和“竖三带”理论建立模型,研究了大孔径高位钻孔瓦斯抽采技术。通过分析煤岩层中卸压瓦斯移动分布规律得知,将钻孔终孔布置在裂隙带上半部和椭抛带的重叠区域内可取得最佳抽放效果,并给出了钻孔仰角及方位角取值范围的计算公式。24207工作面的抽采数据表明,钻场平均抽采浓度在42%左右,平均抽采纯量高达11.6 m3/min。
Taking the Shaqu mine as a research background, a model of the mining oval belt and “vertical three belts” formed by post-caving caving of the working face was established to study the gas drainage technology with high borehole and large borehole. By analyzing the distribution of pressure relief gas in coal rock, it is found that the best drainage effect can be obtained by arranging the end hole of the borehole in the overlapping area of the upper half of the fracture zone and the elliptical zone, The calculation formula of azimuth range. 24207 face extraction data show that the drilling site average pumping concentration of about 42%, with an average pumping capacity of up to 11.6 m3 / min.