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Retracement Ground Pressure Appearance and Control of the Working Face under the Overlying Residual Pillar: A Case Study

Author

Listed:
  • Yongqiang Zhang

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Shendong Tianlong Group Huoluowan Coal Mine, Neimenggu 750306, China)

  • Xiangyu Wang

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

  • Feiteng Zhang

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

  • Menglong Li

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

  • Guanghui Wang

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

  • Dingchao Chen

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

  • Guanjun Li

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

  • Xiangqian Zhao

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

Abstract

On the working face below shallow and close coal seams, there are residual pillars. The mine’s ability to operate safely is constrained by the coal pillars’ vulnerability to sudden instability and powerful ground pressure disasters during withdrawal. This paper uses the 31,106 working face of the Huoluowan coal mine as its research backdrop and employs field observation, theoretical analysis, and numerical simulation to examine the strong dynamic load mechanism of the overlying coal pillars. According to the analysis, the residual pillar’s stress diffusion angle is 29 degrees after mining the working face above it, which has an impact on the main roof’s stability above the working face’s retracement roadway. The main roof is impacted by the excavation disturbance and the remaining pillars during the working face’s final mining phase, displaying a complex stress superposition state. The retracement roadway is significantly deformed as a result of the plastic zone of the surrounding rock changing from small-scale damage to extensive damage. The proposed “hydraulic roof cutting + reinforcement support” prevention technology is based on the prevention idea of weakening important rock strata, changing the stress transmission path, and strengthening adjacent rock. Field testing shows how hydraulic fracturing reinforces the roof structure, lessens the heavy dynamic load on the supporting pillars of overlying residual coal, reduces rock deformation in the retracement roadway, and ensures the stability of the working face during withdrawal. The study’s findings are significant for the secure removal of a working face under similar circumstances.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1701-:d:1062057
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    References listed on IDEAS

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    1. Dingchao Chen & Xiangyu Wang & Feiteng Zhang & Menglong Li & Xiangqian Zhao & Guanjun Li & Yang Yu & Guanghui Wang & Jiaxin Zhao & Xiangdong Wang, 2022. "Research on Directional Controllability of Cracking in Hydraulic Fracturing of Hard Overburden Based on Local Stress Field Intervention," Energies, MDPI, vol. 15(12), pages 1-21, June.
    2. 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.
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    Cited by:

    1. 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.
    2. 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.

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    1. 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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