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Deformation Mechanism and Control Technology of Surrounding Rock of Three-Soft Coal Roadways under High Horizontal Stress

Author

Listed:
  • Xiaoping Xie

    (School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
    School of Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Hongyang Liu

    (School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China)

  • Xinqiu Fang

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

  • Junwei Yang

    (School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
    School of Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Jiangang Liu

    (School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
    School of Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Minfu Liang

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

  • Gang Wu

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

Abstract

Support technology faces challenges in view of the large deformation of surrounding rock in three-soft coal roadways under high horizontal stress in Zijin Coal Mine, China. Geostress near the tested working face of the mine was measured and its distribution law was analyzed through theoretical analysis, numerical simulation analysis, and field measurement. The original supporting scheme of the three-soft coal roadway on the tested working face was analyzed to discover the deformation and failure mechanism of the surrounding rock of the original supporting roadway and the control measures. An optimized support scheme of H-G (hollow grouting) anchor cables, high strength bolts, W-shaped steel belts, metal meshes, and sprayed concretes was proposed for field applications. Based on the roadway in the tested 3201 working face at Zijin Coal Mine, the technical parameters for optimizing the combined support of the roadway were determined. The following results were be obtained through field measurement. The roadway was kept intact after excavation and the optimized support scheme was adopted in the three-soft coal roadway. No obvious deformation in appearance existed in the roof, floor, and roadway coal sides. Compared with the original support scheme, the stability of the roadways was improved visibly. The displacement of the roadway roof decreased from 100 to 30 mm, and that of the roadway coal walls decreased from more than 100 mm to less than 50 mm. This work verifies the effectiveness of a combined support scheme of H-G anchor cables, high strength bolts, W-shaped steel belts, metal meshes, and sprayed concretes to control deformations of surrounding rock in three-soft coal roadways. The new support scheme has good social and economic benefits and can be used as a reference for other roadway supports under similar conditions.

Suggested Citation

  • Xiaoping Xie & Hongyang Liu & Xinqiu Fang & Junwei Yang & Jiangang Liu & Minfu Liang & Gang Wu, 2023. "Deformation Mechanism and Control Technology of Surrounding Rock of Three-Soft Coal Roadways under High Horizontal Stress," Energies, MDPI, vol. 16(2), pages 1-23, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:728-:d:1028729
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    References listed on IDEAS

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    1. Dawid Szurgacz & Jarosław Brodny, 2020. "Adapting the Powered Roof Support to Diverse Mining and Geological Conditions," Energies, MDPI, vol. 13(2), pages 1-22, January.
    2. Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
    3. Xinxian Zhai & Guangshuai Huang & Chengyu Chen & Rubo Li, 2018. "Combined Supporting Technology with Bolt-Grouting and Floor Pressure-Relief for Deep Chamber: An Underground Coal Mine Case Study," Energies, MDPI, vol. 11(1), pages 1-16, January.
    4. Yuantian Sun & Guichen Li & Junfei Zhang & Deyu Qian, 2019. "Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines," Sustainability, MDPI, vol. 11(22), pages 1-17, November.
    5. Dawid Szurgacz & Jarosław Brodny, 2019. "Tests of Geometry of the Powered Roof Support Section," Energies, MDPI, vol. 12(20), pages 1-19, October.
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