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

LONG Gang, HUANG Fei, LI Shuqing, ZHU Yuntao, RONG Youlong, LUO Taiyou, LIU Yong

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

Tunnel Construction >

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

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

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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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

Cite this article

LONG Gang, HUANG Fei, LI Shuqing, ZHU Yuntao, RONG Youlong, LUO Taiyou, LIU Yong .

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

[J]. Tunnel Construction, 2022 , 42(S1) : 486 -492 . DOI: 10.3973/j.issn.2096-4498.2022.S1.057

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