摘要
为解决瓦斯隧道中煤层透气性差所导致的瓦斯预抽工程量大、达标时间长的问题,文章提出了应用控制水力压裂技术来增加瓦斯隧道煤层的透气性,优化了水力压裂压力、流量参数和封孔工艺,并在渝黔铁路新凉风垭瓦斯隧道揭煤中进行了现场应用。结果表明,控制水力压裂有效增加了低透气性煤层透气性,加快了瓦斯抽放效率,相比未实施压裂的相似区域瓦斯预抽达标时间缩短了47%,抽放钻孔工程量降低了42.8%,快速消除了揭煤过程中的瓦斯突出危险。
In order to resolve the problems of poor coal seam permeability, large induced volumes and long time requirements for gas pre-drainage in gas tunnels, controlled hydraulic fracturing technology is presented in this paper to improve the permeability of coal seams in gas tunnels. With an optimized hydraulic fracturing pressure, flow parameters and hole-sealing method, the technology is applied to uncovering coal seams in the new Liangfengya gas tunnel on the Chongqing-Guizhou Railway. The results show that the controlled hydraulic fracturing technology effectively improved the permeability of the coal seams and sped up the gas drainage, with a reduction of the gas pre-drainage time by 47% and drilling works by 42.8%, eliminating the danger of gas outbursts in the process of uncovering the coal seam.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第6期190-194,202,共6页
Modern Tunnelling Technology
基金
重庆市杰出青年基金(cstc2014jcyjjq0020)
重庆市科技攻关项目(cstc2012gg-yyjs90001)
关键词
瓦斯隧道
控制水力压裂
煤层增透
揭煤
Gas tunnel
Controlled hydraulic fracturing
Improvement of the coal seam permeability
Uncovering of the coal seam
