管棚帷幕注浆法在含高压气体巷道掘进中的应用研究

Application Study of Pipe Roof Curtain Grouting Method in Having High Pressure Gas Tunneling

摘要:

帷幕注浆在建井时应用于封堵地下水涌入技术已经比较成熟，但用于封堵地层中气体涌入危害仅见个别实例。在总结前人研究成果的基础上，借用水力学安全厚度的计算方法，研究了煤矿巷道开挖碰到含高压瓦斯、H2S气体构造破碎带的情况，首次将管棚支护技术与帷幕注浆法相结合，确保安全掘进的技术措施。并将研究成果应用于四川龙滩煤矿+450回风石门的掘进，取得了成功。

Abstract:

Curtain grouting method is a mature technology applied to block up the underground water in tunneling. But it was applied to block up the high pressure gas what is very seldom. Driving the coal mine tunnel in fracture zone where having vast high pressure gas (CH4 and H2S) was research. On the basis of studying existing research achievements, the calculating method of Hydraulics safety thickness was applied to count the critical safety thickness. The technique combined the pipe roof technic and curtain grouting method and assured the tunneling safety. This research achievement was triumphantly applied tunneling at +450 wind road, Sichuan province Longtan coal mine.