【摘要】 提高瓦斯抽采效果是保证煤矿安全生产的重要手段，在底板巷道布置穿层钻孔进行抽放是常见的一种抽采方式。瓦斯抽采过程中，穿层抽采钻孔受围岩应力、抽采负压等多种因素的作用，普遍会出现瓦斯流动通道阻塞、抽采钻孔密封段产生裂隙、孔口瓦斯浓度低的现象。针对该问题，提出了利用疏堵增透装置疏通瓦斯流动通道，提高孔底瓦斯浓度；利用二次注浆加压封堵密封段裂隙，调整抽采负压等综合修复措施，在河南龙宇能源股份有限公司某矿二₂煤层12110中间底抽巷进行了应用研究试验。结果表明，采用综合修复技术后，试验钻孔孔口平均瓦斯浓度由修复前的3.75%提高到50.02%,提高了13.3倍，显著提升了孔口瓦斯浓度，延长了抽放时间，提高了煤层瓦斯抽采效果。更多还原

【Abstract】 Improving the efficiency of gas extraction is an important means to ensure the safety of coal mine production, and arranging cross layer drilling in the floor roadway for drainage is a common method of extraction.During the extraction process, the cross layer extraction drilling is affected by various factors such as surrounding rock stress and negative pressure during extraction.It is common for gas flow channels to be blocked, cracks to occur in the sealing section of the extraction drilling hole, and low gas concentration at the orifice.To address this issue, it was proposed to use a unblockage and enhancing permeability device to unblock the gas flow channel and increase the gas concentration at the bottom of the hole.A comprehensive repair measures were conducted using secondary grouting pressure to seal the cracks in the sealing section, adjusting the negative pressure of extraction.An application research experiment was conducted on the middle bottom extraction roadway of No.12110 in the Ⅱ₂ coal seam of Henan Longyu Energy Co.,Ltd.The results showed that after adopting comprehensive restoration technology, the average gas concentration at the experimental borehole increased from 3.75% before restoration to 50.02%,an increase of 13.3 times, significantly increasing the gas concentration at the orifice, prolonging the drainage time, and improving the efficiency of coal seam gas extraction.更多还原