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Prevention and control technologies for abnormal gas emission in tunnel construction through unstable coal-bearing strata
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Lichuan Wang1, Hongwu Xiao2, Fenghua An**, 3, 4, Yanlong Liu2, Zhaofeng Wang4, Zongqing Zhou5
China Safety Science Journal | 2026, 36(4) : 85 - 93
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China Safety Science Journal | 2026, 36(4): 85-93
• Safety Technology and Engineering •
Prevention and control technologies for abnormal gas emission in tunnel construction through unstable coal-bearing strata
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Lichuan Wang1, Hongwu Xiao2, Fenghua An**, 3, 4, Yanlong Liu2, Zhaofeng Wang4, Zongqing Zhou5
Affiliations
  • 1China Railway 18th Bureau Group Co., Ltd., Tianjin 300222, China
  • 2China Railway 23rd Bureau Group Co., Ltd., Chengdu Sichuan 610072, China
  • 3School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
  • 4School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China
  • 5School of Qilu Transportation, Shandong University, Ji'nan Shandong 250002, China
Published: 2026-04-28 doi: 10.16265/j.cnki.issn1003-3033.2026.04.0133
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To prevent the risk of abnormal gas emissions during tunnel excavation through unstable coal-bearing strata, this study focused on the inclined shaft section of Baoanying No.1 Tunnel in the Chengdu-Kunming Railway Expansion Project. Through on-site monitoring, numerical simulation, and engineering application, gas emission patterns, risk identification methods, and prevention technologies were investigated. The results indicate that tunnel gas originates from unstable coal seams and carbonaceous rocks within the strata, and gas emissions correlate strongly with coal/carbon content in surrounding rocks and the degree of geological fracturing. Then an integrated geophysical-geological drilling approach was employed to establish an advanced identification method for abnormal gas emissions. This method utilizes multiple indicators: unfavorable geological bodies, lithological variations, borehole gas concentrations, and emission rates. A "borehole curtain" interception technique was developed for high-efficiency gas risk prevention and control. Boreholes arranged in curtain patterns were drilled from both side chambers to intercept and extract coal-rock gas ahead of the advancing tunnel face. Field applications demonstrate that this technology reduces construction interference and increases advance rates.

unstable coal-bearing strata  /  tunnel construction  /  abnormal gas emission  /  control technology  /  advanced identification method  /  interception and drainage
Lichuan Wang, Hongwu Xiao, Fenghua An, Yanlong Liu, Zhaofeng Wang, Zongqing Zhou. Prevention and control technologies for abnormal gas emission in tunnel construction through unstable coal-bearing strata[J]. China Safety Science Journal, 2026 , 36 (4) : 85 -93 . DOI: 10.16265/j.cnki.issn1003-3033.2026.04.0133
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Year 2026 volume 36 Issue 4
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2026.04.0133
  • Receive Date：2025-11-14
  • Online Date：2026-07-08
  • Published：2026-04-28
Article Data
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History
  • Received：2025-11-14
  • Revised：2026-02-05
Funding
Affiliations
    1China Railway 18th Bureau Group Co., Ltd., Tianjin 300222, China
    2China Railway 23rd Bureau Group Co., Ltd., Chengdu Sichuan 610072, China
    3School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
    4School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China
    5School of Qilu Transportation, Shandong University, Ji'nan Shandong 250002, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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