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Strata Movement of Overburden-Separation Grouting Working Face and Its Influence on Gas Emission during Mining

Author

Listed:
  • Junwen Cao

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Shanxi Coking Coal Huajin Coking Coal Co., Ltd., Lvliang 033000, China)

  • Ting Liu

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yu Shi

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Baiquan Lin

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jiahao Shen

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Youping Xu

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Xiangming Gong

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yanchi Liu

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Due to its excellent effect of surface subsidence reduction, the overburden-separation grouting (OSG) technology has been widely applied to green mining. However, OSG changes the mine pressure, and the resultant gas emission in the stope remains unclear. Therefore, with the 22301 working face of Tunlan Coal Mine as an example, the overburden deformation and stress distribution in the absence and presence of OSG were studied through numerical simulation and on-site tests. Furthermore, the gas emission law in the stope was contrastingly analyzed. The following results were obtained. With the rise of grouting pressure (GP), the subsidence of strata above the separation layer decreases while that below the separation layer increases; the heave displacement of floor strata below the coal seam gradually decreases. OSG significantly changes the geometric shape and range of the overburden stress relief zone. As the GP rises, the gas enrichment area moves downward continuously and shrinks spatially. Horizontally, the ranges of the stress relief zone and the free space in the goaf shrink, while the range and compaction degree of the compaction area gradually grow. After OSG, the total amount of gas emission in the working face falls by 52.2%.

Suggested Citation

  • Junwen Cao & Ting Liu & Yu Shi & Baiquan Lin & Jiahao Shen & Youping Xu & Xiangming Gong & Yanchi Liu, 2023. "Strata Movement of Overburden-Separation Grouting Working Face and Its Influence on Gas Emission during Mining," Sustainability, MDPI, vol. 15(17), pages 1-19, August.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:17:p:12792-:d:1223851
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    References listed on IDEAS

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    1. Shaojie Chen & Dawei Yin & Fengwei Cao & Yong Liu & Kaiqiang Ren, 2016. "An overview of integrated surface subsidence-reducing technology in mining areas of China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 1129-1145, March.
    2. Dayang Xuan & Jialin Xu, 2014. "Grout injection into bed separation to control surface subsidence during longwall mining under villages: case study of Liudian coal mine, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(2), pages 883-906, September.
    3. Shaojie Chen & Dawei Yin & Fengwei Cao & Yong Liu & Kaiqiang Ren, 2016. "An overview of integrated surface subsidence-reducing technology in mining areas of China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 1129-1145, March.
    4. Alexander Vitalevich Martirosyan & Yury Valerievich Ilyushin, 2022. "The Development of the Toxic and Flammable Gases Concentration Monitoring System for Coalmines," Energies, MDPI, vol. 15(23), pages 1-13, November.
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