封堵一体化封孔技术在屯兰矿的应用

Application of Integrated Borehole Sealing Technology in Tunlan Coal Mine

封孔是瓦斯抽采与利用的关键技术环节,针对屯兰矿瓦斯抽采存在漏气严重的问题,建立数学模型,模拟分析了瓦斯抽采漏气情况,模拟结果显示,瓦斯抽采钻孔的漏气量随着封孔材料的支护阻力增大而降低;同一支护阻力下,漏气量随时间推移而升高。提出“封堵一体化”封孔技术,在12507轨道巷的试验结果表明,使用“封堵一体化”封孔技术密封的钻孔预抽期内的平均浓度可达40.4%,相比于“两堵一注”法密封的钻孔实现抽采浓度的翻倍。

Borehole sealing is a key technical link in gas drainage and utilization.Aiming at the serious gas leakage problem in gas drainage in Tunlan mine,a mathematical model is established to simulate and analyze the gas leakage in gas drainage.The simulation results show that the air leakage of the borehole decreases as the supporting resistance of the sealing material increases,but the total amount of air leakage has nothing to do with the supporting resistance,and always increases with the passing of time.The sealing integration technology is proposed.The test results in the 12507 roadway show that the average concentration of the borehole gas with the sealing integration technology during the pre-draining period can reach 40.4%,compared with the two-end sealing and one-end injection method.