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Study on Coal Pillar Setting and Stability in Downward Mining Section of Close Distance Coal Seam

Author

Listed:
  • Longpei Ma

    (Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan 232000, China
    School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, China)

  • Chongyan Liu

    (Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan 232000, China
    Coal Mine Safety Mining Equipment Innovation Center of Anhui Province, Anhui University of Science and Technology, Huainan 232000, China)

  • Guangming Zhao

    (Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan 232000, China
    Coal Mine Safety Mining Equipment Innovation Center of Anhui Province, Anhui University of Science and Technology, Huainan 232000, China)

Abstract

To investigate the reasonable width of a coal pillar in the downward mining section of close-distance coal seams, the stress state of any point below the residual coal pillar in the overlying goaf and the width of a small coal pillar were studied by theoretical calculation, numerical simulation, similar simulation and field monitoring. The findings indicate that the width range of the small coal pillar is 7.92~11.42 m. The 4-1 coal seam is in the stress reduction zone when it is more than 16.6 m horizontally from the border of the residual coal pillar above it. In addition, the peak stress is situated inside the elastic zone of the coal pillar and is lower than the coal pillar’s bearing limit when a small coal pillar of 8 m is maintained. With the help of distributed optical fiber monitoring to model the coal pillars’ stress distribution, it is found that 8 m simulated coal pillars have a certain bearing capacity. The practical findings demonstrate that the 8 m small coal pillar that was left on the site satisfies the demand, and the convergence of the roadway’s floor and roof, and its two sides fall within the controllable range. The findings of the study offer a reference for the location of a return air roadway and the width of section coal pillars in the downward mining of close-distance coal seams.

Suggested Citation

  • Longpei Ma & Chongyan Liu & Guangming Zhao, 2024. "Study on Coal Pillar Setting and Stability in Downward Mining Section of Close Distance Coal Seam," Energies, MDPI, vol. 17(21), pages 1-14, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:21:p:5441-:d:1511038
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    References listed on IDEAS

    as
    1. Yongkang Yang & Xuecong Xu & Chenlong Wang, 2023. "Study on the Mechanism of Surrounding Rock Deformation and Its Control for Roof Cutting Retained Gob-Side Entry in Close-Distance Coal Seams Co-Mining," Energies, MDPI, vol. 16(11), pages 1-17, May.
    2. Feng Cui & Chong Jia & Xingping Lai & Yanbing Yang & Shuai Dong, 2020. "Study on the Law of Fracture Evolution under Repeated Mining of Close-Distance Coal Seams," Energies, MDPI, vol. 13(22), pages 1-20, November.
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