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Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Author

Listed:
  • Chaowen Hu

    (Huaneng Coal Technology Research Co., Ltd., Beijing 100070, China
    Transportation Institute, Inner Mongolia University, Hohhot 010070, China)

  • Eryu Wang

    (School of Mine and Coal, Inner Mongolia University of Science and Technology, Baotou 014010, China)

  • Qian Li

    (Huaneng Coal Technology Research Co., Ltd., Beijing 100070, China)

  • Yilong Wang

    (Huaneng Coal Technology Research Co., Ltd., Beijing 100070, China)

  • Yongyuan Li

    (Huaneng Coal Technology Research Co., Ltd., Beijing 100070, China)

  • Xingfeng Sha

    (Huaneng Coal Technology Research Co., Ltd., Beijing 100070, China)

Abstract

In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal cutting height was 16 m and the optimal cutting angle was 15°. The effect of pressure relief by roof cutting was verified by FLAC3D. It is proposed to use deep-hole loosening blasting to solve the problem of the sandstone with a thick hard roof being difficult to collapse. A group of loose blasting holes was designed to be arranged every 20 m in the gob-side roadway. The depth of the #1 blasthole was 47 m, and the angle to the horizontal direction was 20°; the depth of the #2 blasthole was 65 m, and the angle to the horizontal direction was 15°. A field test was carried out in the 7135 ventilation roadway of Qidong Coal Mine China. The on-site peeping results showed that the blasting with the energy-gathering pipe had a good effect of directional slitting. After deep-hole loosening blasting, the thick hard sandstone roof collapsed and filled the gob in time. The monitoring curves of the hydraulic support showed that the hydraulic support resistance of the working face in the side with roof cutting was much smaller than that of the side without roof cutting, and the effect of pressure relief by roof cutting was good.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:16:p:9941-:d:885948
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    References listed on IDEAS

    as
    1. Xiaoyu Liu & Manchao He & Jiong Wang & Zimin Ma, 2021. "Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof," Energies, MDPI, vol. 14(2), pages 1-14, January.
    2. 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.
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    Cited by:

    1. Hanrui Zhang & Changyou Liu & Zhenhua Chen & Xin Yu & Kun Zhang & Huaidong Liu, 2023. "Analysis and Application of Hydraulic Fracturing to Control Hard and Stable Roof in Initial Mining Stage," Sustainability, MDPI, vol. 15(13), pages 1-14, July.

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