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Analysis of Roof Stability of Coal Roadway Heading Face

Author

Listed:
  • Chao Su

    (College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
    Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
    Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China)

  • Pengfei Jiang

    (Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
    Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China)

  • Peilin Gong

    (College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China)

  • Chang Liu

    (Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
    Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China)

  • Peng Li

    (Department of Mining Engineering, Shanxi Institute of Energy, Jinzhong 030600, China)

  • Yuedong Liu

    (Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
    Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China)

Abstract

One of the challenges that urgently needs to be addressed, both in current times and in the future, is to improve the heading speed of coal roadways. The roof instability of the heading face is the main factor restricting the rapid heading of coal roadways. Based on the theory of thin plate, a mechanical model of the roof in the heading face is established, the distribution law of deflection, stress, and internal force is discussed, and the supporting principle of the roof is clarified. Through a Flac3D numerical simulation, the main influencing factors of roof stability in the heading face are analyzed, including ground stress, surrounding rock strength, roadway section, unsupported distance, etc., and the regression analysis of each factor is carried out by evaluating the amount of roof subsidence. The results show that the maximum tensile stress and the corresponding bending moment of the roof appear at the fixed supported edge, and the maximum compressive stress and the maximum value of the corresponding bending moment appear at the center of the roof slightly close to the simply supported edge. In the on-site construction process, the position close to the fixed supported edge needs to be supported first. The roof subsidence has a positive exponential relationship with the stress level, a negative exponential relationship with the surrounding rock strength, a quadratic functional relationship with the roadway section, and a logarithmic relationship with the unsupported distance. In fractional support, the initial partial support can timely reduce the roof span and partially recover the confining pressure. Under certain geological and production conditions, the use of fractional support can not only effectively maintain the stability of the roadway but also speed up the heading speed. According to the research results, it is determined that in the auxiliary transportation roadway of the Caojiatan Coal Mine, the 122,110 working face adopts the fractional support model, the maximum roof subsidence is 18 mm, the roof is stable, and the monthly progress is more than 1000 m, which significantly improves the roadway heading speed.

Suggested Citation

  • Chao Su & Pengfei Jiang & Peilin Gong & Chang Liu & Peng Li & Yuedong Liu, 2022. "Analysis of Roof Stability of Coal Roadway Heading Face," Energies, MDPI, vol. 15(20), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7588-:d:942445
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    References listed on IDEAS

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    1. Peng Ma & Deyu Qian & Nong Zhang & Hideki Shimada & Dongjiang Pan & Kejun Huang, 2020. "Application of Bolter Miner Rapid Excavation Technology in Deep Underground Roadway in Inner Mongolia: A Case Study," Sustainability, MDPI, vol. 12(7), pages 1-17, March.
    2. Kang Yi & Zhenghe Liu & Zhiguo Lu & Junwen Zhang & Shuangyong Dong, 2020. "Effect of Axial In-Situ Stress in Deep Tunnel Analysis Considering Strain Softening and Dilatancy," Energies, MDPI, vol. 13(6), pages 1-14, March.
    3. Peng Li & Xingping Lai & Peilin Gong & Chao Su & Yonglu Suo, 2020. "Mechanisms and Applications of Pressure Relief by Roof Cutting of a Deep-Buried Roadway near Goafs," Energies, MDPI, vol. 13(21), pages 1-16, November.
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    Cited by:

    1. Vu, Anh Ngoc, 2023. "Demand reduction campaigns for the illegal wildlife trade in authoritarian Vietnam: Ungrounded environmentalism," World Development, Elsevier, vol. 164(C).

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