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Risk Assessment and Control Strategy of Residual Coal Pillar in Room Mining: Case Study in Ecologically Fragile Mining Areas, China

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  • Hengfeng Liu

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

  • Qiang Sun

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China)

  • Nan Zhou

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

  • Zhongya Wu

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

Abstract

Gradual instability of coal pillars left behind underground with room mining is one of the main reasons for sudden roof caving in the gob, surface subsidence, and other significant hazards. Moreover, room mining implies great losses of coal resources. In this paper, the main failure mode and room mining coal pillar process were analyzed according to the coalfield regional engineering geological and hydrogeological conditions. A numerical model was adopted to study the effect of different sizes of coal mining pillars and progressive instability failure of coal pillar on the plastic zone’s evolution characteristics and stress field of coal pillars in the stope. The proposed technologies of cemented paste backfilling and reinforcement of residual coal pillars are applied, and a numerical simulation model is established to study the strata movement characteristics and analyze the stability degree of residual coal pillar and key aquiclude strata in the Pliocene series of Neogene. Consequently, the performance and application prospect were evaluated. The results obtained substantiate a new method for the long-term stability control of coal pillars in room mining and protecting the ecological environment in China’s western eco-environmental frangible area.

Suggested Citation

  • Hengfeng Liu & Qiang Sun & Nan Zhou & Zhongya Wu, 2021. "Risk Assessment and Control Strategy of Residual Coal Pillar in Room Mining: Case Study in Ecologically Fragile Mining Areas, China," Sustainability, MDPI, vol. 13(5), pages 1-13, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:5:p:2712-:d:509449
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    References listed on IDEAS

    as
    1. Ebrahim Ghasemi & Mohammad Ataei & Kourosh Shahriar, 2014. "Prediction of global stability in room and pillar coal mines," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 72(2), pages 405-422, June.
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    Cited by:

    1. Yongqiang Zhang & Xiangyu Wang & Feiteng Zhang & Menglong Li & Guanghui Wang & Dingchao Chen & Guanjun Li & Xiangqian Zhao, 2023. "Retracement Ground Pressure Appearance and Control of the Working Face under the Overlying Residual Pillar: A Case Study," Energies, MDPI, vol. 16(4), pages 1-21, February.
    2. Wenda Wu & Guorui Feng & Xiuxiu Yu & Jianbiao Bai & Xiangyu Wang & Xiangzhuo Zhao, 2023. "Investigation into Pressure Appearances and Hydraulic Fracturing Roof-Cutting Technology in Mining Working Face under Residual Pillars: A Case Study," Energies, MDPI, vol. 16(9), pages 1-17, May.

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