非煤系地层瓦斯隧道施工关键技术与管理研究

Research on Key Technologies and Management of Gas Tunnel Construction in Non-coal Measure Strata

非煤系地层瓦斯隧道与煤系地层瓦斯隧道在瓦斯来源、赋存、释放等方面存在本质上的不同,国内外对煤系地层瓦斯隧道施工及瓦斯监控技术研究较多,对非煤系地层瓦斯隧道大多参照煤系地层瓦斯隧道的技术进行管理,相关专题研究较少。基于新建兰渝铁路肖家梁隧道和新建渝怀二线黄草隧道两座不同类型的非煤系地层瓦斯隧道的施工实例,深入分析非煤系构造连通型瓦斯隧道和页岩气地层瓦斯隧道的瓦斯特点,提出瓦斯预报先行、通风稀释排出为主要手段、人工和自动监测相结合的瓦斯管理关键技术。经现场工程实践表明,施工安全得到了保证,投资和工期得到了控制,取得了良好的效果,为非煤系地层瓦斯隧道的安全管控提供了借鉴经验。

Gas tunnels in non-coal measure strata are essentially different from those in coal measure strata in terms of the gas source, reservoir and release. There are many studies on the construction and gas monitoring technology for gas tunnels in coal measure strata at home and abroad, and most of the gas tunnels in non-coal measure strata are managed through the technology for gas tunnels in coal measure strata, with few specific studies. Based on the construction cases of two different types of non-coal measure strata gas tunnels, namely the Xiaojialiang Tunnel of the New Lanzhou-Chongqing Railway and the Huangcao Tunnel of the New Chongqing-Huaihua Second Line, this paper deeply analyzes the gas features of connected gas tunnels in non-coal measure strata and gas tunnels in shale gas formation, and puts forward the key gas management technology mainly based on gas forecasting and ventilation dilution and discharge, and combining manual and automatic monitoring. The field engineering practice shows that construction safety is guaranteed, the investment and construction period is controlled, and good results are achieved, which provides reference experience for the safety management and control of gas tunnels in non-coal measure strata.