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Study of Key Technology of Gob-Side Entry Retention in a High Gas Outburst Coal Seam in the Karst Mountain Area

Author

Listed:
  • Zhenqian Ma

    (School of Mining, Guizhou University, Guiyang 550025, China)

  • Dongyue Zhang

    (School of Mining, Guizhou University, Guiyang 550025, China)

  • Yunqin Cao

    (School of Mining, Guizhou University, Guiyang 550025, China)

  • Wei Yang

    (Guizhou Panjiang Coal and Electricity Group Technology Research Institute Co., Ltd., Guiyang 550081, China)

  • Biao Xu

    (Guizhou Qianxi Honglin Mining Co., Ltd., Bijie 551500, China)

Abstract

In the gob-side entry retaining by roof cutting (GERRC) technique, pressure is offloaded via directional roof cutting, and a roadway is automatically formed due to the ground pressure and rock-breaking expansion. To improve the application of the theory and technical system of GERRC in the Karst area in Southwest China, this research studies the key technology of GERRC in a high gas outburst coal seam, based on the engineering background of the 39114 working face of the Honglin coal mine. According to the geological conditions of the 39114 working face, by means of formula calculation, UDEC numerical modeling, and on-site drilling peeping, the optimal roof-cutting parameters suitable for the 39114 working face were determined: the roof cutting height was 7 m, the roof cutting angle was 15°, and the spacing of pre-splitting blasting holes was 600 mm. Additionally, the above roof-cutting parameters have achieved good results in the engineering practices of the 39114 transportation roadway, which shows that the technology of GERRC is feasible in high gas outburst mines and achieves the goal of safe and efficient mining.

Suggested Citation

  • Zhenqian Ma & Dongyue Zhang & Yunqin Cao & Wei Yang & Biao Xu, 2022. "Study of Key Technology of Gob-Side Entry Retention in a High Gas Outburst Coal Seam in the Karst Mountain Area," Energies, MDPI, vol. 15(11), pages 1-21, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:11:p:4161-:d:832400
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    References listed on IDEAS

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    1. Yajun Wang & Yubing Gao & Eryu Wang & Manchao He & Jun Yang, 2018. "Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting," Energies, MDPI, vol. 11(3), pages 1-17, March.
    2. Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
    3. Zimin Ma & Jiong Wang & Manchao He & Yubing Gao & Jinzhu Hu & Qiong Wang, 2018. "Key Technologies and Application Test of an Innovative Noncoal Pillar Mining Approach: A Case Study," Energies, MDPI, vol. 11(10), pages 1-22, October.
    4. 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.
    5. Xingen Ma & Manchao He & Jiong Wang & Yubing Gao & Daoyong Zhu & Yuxing Liu, 2018. "Mine Strata Pressure Characteristics and Mechanisms in Gob-Side Entry Retention by Roof Cutting under Medium-Thick Coal Seam and Compound Roof Conditions," Energies, MDPI, vol. 11(10), pages 1-25, September.
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    Cited by:

    1. Chaowen Hu & Eryu Wang & Qian Li & Yilong Wang & Yongyuan Li & Xingfeng Sha, 2022. "Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs," Sustainability, MDPI, vol. 14(16), pages 1-14, August.
    2. 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.

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