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Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel

Author

Listed:
  • Pengxiang Zhao

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Wenjin Zhang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Shugang Li

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Zechen Chang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yajie Lu

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Congying Cao

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yu Shi

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yongyong Jia

    (Xinjiang Coal Science Research Institute, Urumqi 830091, China)

  • Fang Lou

    (Xinjiang Coal Science Research Institute, Urumqi 830091, China)

  • Zongyong Wei

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Jun Liu

    (State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400037, China)

Abstract

To investigate the influence of coal pillar width on the stress variation of narrow coal pillar (NCP) in the gob-side tunnel in an inclined thick coal seam, theoretical analysis, numerical modeling, and field monitoring are performed to determine the optimal width of the narrow coal pillars in inclined coal seams. The mechanical characteristics of the NCP for varying widths were investigated. Furthermore, vertical and horizontal stress were calculated for various widths of the NCP. The results revealed that with the rise in the width, the vertical stress initially increased dramatically and then stabilized, whereas the mean horizontal stress increased gradually. The mathematical relation between stress and NCP widths was represented by two fitting equations. The evolution process of the plastic zone in the NCP under various widths and the damage form of various widths were obtained; that is, when the width was small, the position of the roadway near the shoulder corner of NCP was inclined to the top of NCP. The field monitoring data revealed that the optimum NCP width was 4 m. This NCP width could stabilize the roadway and improve the loss prevention of the NCP at the gob-side tunnel of similar mines.

Suggested Citation

  • Pengxiang Zhao & Wenjin Zhang & Shugang Li & Zechen Chang & Yajie Lu & Congying Cao & Yu Shi & Yongyong Jia & Fang Lou & Zongyong Wei & Jun Liu, 2022. "Numerical Simulation Study on Mechanical Characteristics and Width Optimization of Narrow Coal Pillar in Gob-Side Coal Seam Tunnel," Sustainability, MDPI, vol. 14(23), pages 1-17, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:23:p:16014-:d:989327
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    References listed on IDEAS

    as
    1. V. Loboda & I. Gergel & T. Khodanen & O. Mykhail, 2019. "A Crack between Orthotropic Materials with a Shear Yield Zone at the Crack Tip," Mathematical Problems in Engineering, Hindawi, vol. 2019, pages 1-8, June.
    2. Jingjing Dai & Pengfei Shan & Qi Zhou, 2020. "Study on Intelligent Identification Method of Coal Pillar Stability in Fully Mechanized Caving Face of Thick Coal Seam," Energies, MDPI, vol. 13(2), pages 1-17, January.
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    Cited by:

    1. Changhao Shan & Shenggen Cao & Zeyu Zhang & Kewen Lin & Jialong Sun, 2023. "Numerical Investigation on the Yield Pillar Bearing Capacity under the Two-End-Type Cable Reinforcement," Energies, MDPI, vol. 16(18), pages 1-17, September.

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