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Stability Analysis of Surrounding Rock in Paste Backfill Recovery of Residual Room Pillars

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  • Nan Zhou

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

  • Hao Yan

    (State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, China
    School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney 2052, Australia)

  • Shuyin Jiang

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

  • Qiang Sun

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

  • Shenyang Ouyang

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

Abstract

A method of paste backfill recovery for residual room coal pillars is hereby proposed. The principles and processes of this method are systemically explained to address issues such as mining-induced earthquakes from spontaneous destabilization, surface subsidence, and low recovery rates. These are caused by the instability of residual coal pillars due to their spontaneous combustion in room-and-pillar mining in medium-to-small coalmines in the northern Shaanxi area. This method is based on the local abundance of surface aeolian sand and solid wastes to be used as paste-backfilling materials in coalmines in the northern Shaanxi area. Uniaxial compressive strength, bleeding rate, and slump tests were performed on paste-backfilled samples constituted at different ratios based on the types of materials involved in paste backfilling in the northern Shaanxi region, thereby helping to confirm the optimal ratios for paste-backfilling materials for the Ershike coal mine. A simulation was conducted to investigate the failure, goaf vertical stress distribution, and surface deformation properties of paste-backfilled pillars and coal pillars, where paste backfilling was used with paste-backfilling materials constituted at different compressive strengths. This was to verify the experimental results that would be obtained with paste-backfilling materials constituted at different ratios, and reveal the mechanism by which paste backfilling of residual room pillars can maintain the mine’s surrounding rock stability. These study results are of great instructive significance to the safe recovery of residual room pillars in China’s western mining areas.

Suggested Citation

  • Nan Zhou & Hao Yan & Shuyin Jiang & Qiang Sun & Shenyang Ouyang, 2019. "Stability Analysis of Surrounding Rock in Paste Backfill Recovery of Residual Room Pillars," Sustainability, MDPI, vol. 11(2), pages 1-13, January.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:2:p:478-:d:198583
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    References listed on IDEAS

    as
    1. Hengjie Luan & Huili Lin & Yujing Jiang & Yahua Wang & Jiankang Liu & Pu Wang, 2018. "Risks Induced by Room Mining Goaf and Their Assessment: A Case Study in the Shenfu-Dongsheng Mining Area," Sustainability, MDPI, vol. 10(3), pages 1-17, February.
    2. Yuejin Zhou & Meng Li & Xiaoding Xu & Xiaotong Li & Yongdong Ma & Zhanguo Ma, 2018. "Research on Catastrophic Pillar Instability in Room and Pillar Gypsum Mining," Sustainability, MDPI, vol. 10(10), pages 1-11, October.
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    Cited by:

    1. Krzysztof Skrzypkowski & Waldemar Korzeniowski & Krzysztof Zagórski & Anna Zagórska, 2019. "Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter," Energies, MDPI, vol. 12(19), pages 1-23, September.
    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.
    3. Krzysztof Skrzypkowski, 2021. "Determination of the Backfilling Time for the Zinc and Lead Ore Deposits with Application of the BackfillCAD Model," Energies, MDPI, vol. 14(11), pages 1-19, May.

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