大断面公路隧道穿越构造煤层瓦斯抽放技术研究

龙港, 黄飞, 李树清, 朱云涛, 戎有龙, 罗太有, 刘勇

doi:10.3973/j.issn.2096-4498.2022.S1.057

隧道建设 >

2022 , Vol. 42 >Issue S1: 486 - 492

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S1.057

施工技术

大断面公路隧道穿越构造煤层瓦斯抽放技术研究

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（1．湖南科技大学资源环境与安全工程学院，湖南湘潭 411201；2．湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室，湖南湘潭 411201；3. 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地，河南焦作 454003；4. 中交路桥南方工程有限公司，北京 101149； 5. 贵阳景烁安全科技有限公司，贵州贵阳 550000）

网络出版日期: 2022-08-23

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Gas Drainage Technology During Large CrossSection Highway Tunnel Crossing though Tectonic Coal Seam

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(1. School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 2. The SAWS Laboratory of Prevention and Controlling the Roof, Coal and Gas Outburst in Coal Mine of South China, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China; 3. State Key Laboratory of Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China; 4. CCCC Road & Brige Southern Engineering Co., Ltd., Beijing 101149, China; 5. Guiyang Jingshuo Safety Technology Co., Ltd., Guiyang 550000, Guizhou, China)

Online published: 2022-08-23

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摘要

为有效降低隧道煤层的瓦斯含量，消除隧道揭煤施工的突出危险，以兰海国家高速公路重庆至遵义段某公路隧道为工程依托，采用超前钻探的方法准确探测煤层的赋存情况与隧道揭煤掌子面前方的局部地质构造特征；在此基础上确定钻孔的有效抽放半径与瓦斯抽放控制范围，并对局部构造煤层抽放钻孔进行加密布置；最后采用顶板穿层钻孔预抽煤层瓦斯技术进行瓦斯抽放，并对抽放效果和区域防突措施进行检验。结果表明：该隧道瓦斯抽放效果良好，区域防突措施效果显著。

关键词： 大断面公路隧道; 构造煤层; 瓦斯抽放; 防突措施; 抽放半径

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龙港, 黄飞, 李树清, 朱云涛, 戎有龙, 罗太有, 刘勇 . 大断面公路隧道穿越构造煤层瓦斯抽放技术研究[J]. 隧道建设, 2022 , 42(S1) : 486 -492 . DOI: 10.3973/j.issn.2096-4498.2022.S1.057

Abstract

To effectively reduce the gas concentration of the tunnel coal seam and eliminate the gas outburst risk, a case study is conducted on a highway tunnel in the ChongqingZunyi section of the Lanhai National Expressway. The advance drilling and detection method is employed to accurately detect the coal seam′s storage condition and the local geological structure characteristics in front of the tunnel coal uncovering face. On this basis, the effective drilling radius and gas drainage control range are determined, and the gas drainage boreholes of the local tectonic coal seam are increased. Finally, the gas drainage is carried out using predrilling in the roof, and the drainage effect and regional antioutburst measures are tested. The results show that the method adopted reaches a good gas drainage effect and the regional gas outburst risk is effectively reduced.

Key words： large crosssection highway tunnel; tectonic seam; gas drainage; antioutburst measures; drilling radius

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