School of Safety Engineering, China University of Mining and Technology School of Mining Engineering, Inner
Mongolia University of Science and Technology

针对本煤层瓦斯抽采钻孔漏风严重、抽采浓度低和有效抽采周期短的技术难题,分析了煤层瓦斯抽采钻孔的漏风机理和封孔关键技术,提出煤层瓦斯抽采钻孔径向膨胀渗透封孔技术,阐述了该技术封堵钻孔周边裂隙带的技术原理。最后结合实例确定了某矿2210工作面煤层瓦斯抽采钻孔的合理封孔深度为16 m,试验表明采用径向膨胀渗透封孔技术后,钻孔瓦斯抽采体积分数提高21%～32%,平均抽采流量提高0.016 m3/min,可延长抽采期1～2个月,既保证瓦斯抽采的安全、高效进行,又避免了封孔材料的浪费和抽采盲区的形成。

According to the serious air leakage of the gas drainage borehole in the mining seam, low drained gas content and short effective gas drainage period, t his paper analyzed the air leakage mechanism and key technology of borehole sealing of the gas drainage boreholes in the mining seam, provided the radial swelling a nd permeation sealing technology of the gas drainage borehole in the mining seam and stated the technical principle of the technology to seal the borehole with crack Z one around the borehole. Finally, combination with the cases, a rational borehole sealing depth of the gas drainage borehole for No. 2210 coal mining face in a mine wa s determined as 16 m. The experiment showed that with the application of the radial swelling and permeation sealing technology, the fraction of the gas drainage volum e was increased by 21% ~ 32%, the average gas drainage flow was increased by 0.016 m3/ min and the gas drainage period could be extended by 1 ~ 2 months. Thu s a safety and high efficient gas drainage could be ensured and the waste of the sealing material and the formation of the gas drainage blind zone could be avoided.