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A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems

Author

Listed:
  • Rui Wu

    (School of Resources and Environmental Engineering, JiangXi University of Science and Technology, Ganzhou 341000, China)

  • Qingyuan He

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

  • Joung Oh

    (School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia)

  • Zecheng Li

    (School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia)

  • Chengguo Zhang

    (School of Mining Engineering, Faculty of Engineering, University of New South Wales, Sydney 2052, Australia)

Abstract

The gob-side entry layout is popular at two-entry longwall mine sites in China for the benefit of improving the coal recovery rate. Currently, two methods have been widely used to develop gob-side entries, including gob-side entry retaining and gob-side entry driving. Gob-side entry retaining maximizes the recovery rate by pillarless mining but increases the difficulty in gob-side entry support. Also, this method has limited applications in hard roof conditions. The gob-side entry driving mine site uses the rib pillar to separate the gob entry and the gob area of the previous panel, which leads to additional coal losses. The waste is more intolerable in large-cutting-height panels and longwall top coal caving panels as the Chinese government limits the minimum recovery rate of longwall panels using these mining methods. In this paper, a new gob-side entry layout method, termed gob-side pre-backfill driving, is established to overcome the shortcomings of the existing methods. The new method eliminates rib pillar losses and enhances gob-side entry stability. The feasibility of gob-side pre-backfill driving is studied by numerical modelling and a field trial at Changcun Mine in China. The results indicate that gob-side pre-backfill driving is an alternative for gob-side entry development. This method is practical and also has the potential to bring significant economic benefits to the mining industry.

Suggested Citation

  • Rui Wu & Qingyuan He & Joung Oh & Zecheng Li & Chengguo Zhang, 2018. "A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems," Energies, MDPI, vol. 11(8), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:2084-:d:163097
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    Citations

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    Cited by:

    1. Xuming Zhou & Haotian Li & Xuelong Li & Jianwei Wang & Jingjing Meng & Mingze Li & Chengwei Mei, 2022. "Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine," Sustainability, MDPI, vol. 14(16), pages 1-16, August.
    2. 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.

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