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Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines

Author

Listed:
  • Ya Tian

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

  • Lixiao Tu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Xiang Lu

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

  • Wei Zhou

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Izhar Mithal Jiskani

    (NUST Balochistan Campus, National University of Sciences & Technology, Quetta 87300, Pakistan)

  • Fuming Liu

    (Xinjiang Tianchi Energy Sources Co., Ltd., Changji 831100, China)

  • Qingxiang Cai

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

Abstract

Open-pit mining is a common method for extracting coal, but considerable resources are often left unrecovered at the bottom of end-slopes, leading to a permanent waste of resources. This research presents a sustainable approach of multi-layer highwall mining at different levels to address the issue of abundant resources left unrecovered at the bottom of the end-slope in thick-seam open-pit mines. The interlayer between the upper and lower entries is simplified into a beam structure model, the bending moment distribution characteristics of the beam under a load of highwall miner are analyzed, and a method for calculating the thickness range of the interlayer is proposed. The web pillar width and interlayer thickness, obtained theoretically, are verified through a numerical simulation, and the results of mining a single layer are compared to those of mining multiple layers. The results show that the web pillar width and interlayer thickness derived from the numerical simulation are basically the same as those of the theoretical analysis. Compared with single layer mining, the vertical stress on the web pillar in the lowest panel is reduced by 14.83~18.25%, and the safety factor of the web pillar is increased to 0.27. The web pillars and interlayers at different elevations are stable during multi-layer highwall mining. These findings support the feasibility of multi-layer highwall mining for resource recovery, which is conducive to sustainable mining.

Suggested Citation

  • Ya Tian & Lixiao Tu & Xiang Lu & Wei Zhou & Izhar Mithal Jiskani & Fuming Liu & Qingxiang Cai, 2023. "Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines," Sustainability, MDPI, vol. 15(4), pages 1-19, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:4:p:3603-:d:1069840
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    References listed on IDEAS

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    1. Marat M. Khayrutdinov & Vladimir I. Golik & Alexander V. Aleksakhin & Ekaterina V. Trushina & Natalia V. Lazareva & Yulia V. Aleksakhina, 2022. "Proposal of an Algorithm for Choice of a Development System for Operational and Environmental Safety in Mining," Resources, MDPI, vol. 11(10), pages 1-16, September.
    2. Yang, Chuxiao & Hao, Yu & Irfan, Muhammad, 2021. "Energy consumption structural adjustment and carbon neutrality in the post-COVID-19 era," Structural Change and Economic Dynamics, Elsevier, vol. 59(C), pages 442-453.
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