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Study on Stability Discrimination Technology of Stope Arch Structure

Author

Listed:
  • Quansheng Li

    (State Key Laboratory of Coal Mining Water Resources Protection and Utilization, Beijing 102209, China
    National Energy Group, Beijing Low-Carbon Clean Energy Research Institute, Beijing 102209, China)

  • Yanjun Zhang

    (College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Yongqiang Zhao

    (State Key Laboratory of Coal Mining Water Resources Protection and Utilization, Beijing 102209, China
    National Energy Group, Beijing Low-Carbon Clean Energy Research Institute, Beijing 102209, China
    China Shenhua Energy Company Limited, Beijing 102209, China)

  • Yuanhao Zhu

    (College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Yueguan Yan

    (College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

Abstract

The stress of rock strata changes under mining action, and the arch structure will be formed around the mining area. The stability study of the arch structure has crucial scientific value for solving the problems of stope pressure and surface subsidence. In this paper, the development process of rock strata arch structure is studied by theoretical analysis and particle flow numerical simulation, and the stability of the arch structure is analyzed. At the same time, based on the rock strata breaking theory, the calculation formulas of the development height and the critical width of the instability of the arch structure are obtained, and the correctness of the formula is verified by numerical simulation. The results show that during the mining stage of the working face, the rock strata arch structure has experienced the process of arching-arch breaking, and the instability of the arch structure is the root cause of increasing surface subsidence damage. The arch structure development height h is the sum of rock strata breaking height H i and unbroken rock strata arch development height H ig . The theoretical calculation shows that when the width:depth ratio of the working face is 1.60, the height of the arch structure exceeds the bedrock top, which is consistent with the numerical simulation results and verifies the correctness of the formula. By defining the instability coefficient C of rock strata arch structure, a method to judge the stability of the arch structure is provided. The theoretical calculation shows that the critical width L 0 of the arch structure instability is 134 m, which is not much different from the numerical simulation results of 136 m, and the correctness of the formula is proved. The research results have particular reference value for preventing ground disasters caused by underground coal mining and controlling ground subsidence and provide a reference for the application of the particle flow method in studying rock strata movement.

Suggested Citation

  • Quansheng Li & Yanjun Zhang & Yongqiang Zhao & Yuanhao Zhu & Yueguan Yan, 2022. "Study on Stability Discrimination Technology of Stope Arch Structure," Sustainability, MDPI, vol. 14(17), pages 1-16, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:17:p:11082-:d:907237
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    References listed on IDEAS

    as
    1. Yueguan Yan & Yanjun Zhang & Yuanhao Zhu & Jinchi Cai & Junyao Wang, 2022. "Quantitative Study on the Law of Surface Subsidence Zoning in Steeply Inclined Extra-Thick Coal Seam Mining," Sustainability, MDPI, vol. 14(11), pages 1-24, May.
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