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Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar

Author

Listed:
  • Kai Wang

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Department of Mining Engineering, Shanxi Institute of Technology, Yangquan 045000, China)

  • Yanli Huang

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

  • Huadong Gao

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

  • Wen Zhai

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    National Energy Group Ningxia Coal Industry Co., Ltd. Zaoquan Coal Mine, Yinchuan 751400, China)

  • Yongfeng Qiao

    (Department of Electrical Engineering and Automation, Shanxi Institute of Technology, Yangquan 045000, China)

  • Junmeng Li

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

  • Shenyang Ouyang

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

  • Wei Li

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

Abstract

To improve the resource recovery efficiency of mining face in thick coal seams, the correlation between deformation failure of bottom coal in the gob-side entry and coal pillar width was analyzed by theoretical analysis, numerical calculation, and similar simulation experiments. The results showed that, when the coal pillar was strong, with the decrease of pillar width, the failure depth of the bottom coal in the gob-side entry and floor heave increased. The deformation failure depth of the bottom coal in the entry was inversely related to the width of the coal pillar. The bottom coal was further fractured and dispersed under the action of tension, shear, and extrusion in the process of floor heave. Based on the floor heave induced by the narrow coal pillar, a recovery technique of the bottom coal with thick coal seams in the gob-side entry was developed. The width of the narrow pillar to be reserved was obtained by theoretical calculation and revised by numerical simulation; ultimately, the reasonable width was determined. Under the complex stress of the narrow pillar, the bottom coal in the gob-side entry was fully heaved, cracked, and separated. To realize the comprehensive mechanization and resource recovery of bottom coal, a matching mining excavator loader, transfer conveyor, and retractable belt conveyor were selected to transport the crushed bottom coal in the entry. This method has been successfully applied to the return airway of working face 8407 in the No. 5 Coal Mine of Yangquan Coal Group with remarkable economic and social benefits.

Suggested Citation

  • Kai Wang & Yanli Huang & Huadong Gao & Wen Zhai & Yongfeng Qiao & Junmeng Li & Shenyang Ouyang & Wei Li, 2020. "Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar," Energies, MDPI, vol. 13(13), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3368-:d:378927
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    References listed on IDEAS

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    1. Housheng Jia & Luyao Wang & Kai Fan & Bo Peng & Kun Pan, 2019. "Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study," Energies, MDPI, vol. 12(15), pages 1-21, August.
    2. Jinzhu Hu & Manchao He & Jiong Wang & Zimin Ma & Yajun Wang & Xingyu Zhang, 2019. "Key Parameters of Roof Cutting of Gob-Side Entry Retaining in a Deep Inclined Thick Coal Seam with Hard Roof," Energies, MDPI, vol. 12(5), pages 1-19, March.
    3. Jingjing Dai & Pengfei Shan & Qi Zhou, 2020. "Study on Intelligent Identification Method of Coal Pillar Stability in Fully Mechanized Caving Face of Thick Coal Seam," Energies, MDPI, vol. 13(2), pages 1-17, January.
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    Cited by:

    1. Kuidong Gao & Xiaodi Zhang & Liqing Sun & Qingliang Zeng & Zhihai Liu, 2021. "Loading Performance of a Novel Shearer Drum Applied to Thin Coal Seams," Energies, MDPI, vol. 14(2), pages 1-21, January.
    2. Yongli Liu & Jingtao Li & Yanwei Duan & Tao Qin & Zhenwen Liu, 2023. "Study on the Influence of Roadway Structural Morphology on the Mechanical Properties of Weakly Cemented Soft Rock Roadways," Sustainability, MDPI, vol. 15(1), pages 1-16, January.
    3. Dejian Ma & Xin Zhang & Lirong Wan & Qingliang Zeng & Hongen Ge, 2020. "Dynamic Analysis of Shearer Traction Unit Considering the Longitudinal Swing," Energies, MDPI, vol. 13(20), pages 1-15, October.
    4. Shengrong Xie & Fangfang Guo & Yiyi Wu, 2022. "Control Techniques for Gob-Side Entry Driving in an Extra-Thick Coal Seam with the Influence of Upper Residual Coal Pillar: A Case Study," Energies, MDPI, vol. 15(10), pages 1-21, May.
    5. Piotr Małkowski & Łukasz Ostrowski & Łukasz Bednarek, 2020. "The Effect of Selected Factors on Floor Upheaval in Roadways—In Situ Testing," Energies, MDPI, vol. 13(21), pages 1-23, October.
    6. 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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