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Volume 46 Issue 12
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ZHANG Xiang, ZHU Sitao, JIANG Fuxing, LIU Jinhai, ZHU Quanjie, SHI Xianfeng, HAN Gang, WEI Xiaohu, CAO Jinglong, QU Xiaocheng. Mechanism of instability induced scour of thick hard rock-coal pillar structure in deep fully mechanized working face with large mining height[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2570-2579. DOI: 10.11779/CJGE20230892
Citation: ZHANG Xiang, ZHU Sitao, JIANG Fuxing, LIU Jinhai, ZHU Quanjie, SHI Xianfeng, HAN Gang, WEI Xiaohu, CAO Jinglong, QU Xiaocheng. Mechanism of instability induced scour of thick hard rock-coal pillar structure in deep fully mechanized working face with large mining height[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2570-2579. DOI: 10.11779/CJGE20230892
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Mechanism of instability induced scour of thick hard rock-coal pillar structure in deep fully mechanized working face with large mining height

  • 1.

    School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • 2.

    Shandong Energy Group Company Limited, Jinan 250014, China

  • 3.

    North China Institute of Science and Technology, Hebei Province Mine Disaster Prevention Primary Laboratory, Langfang 101601, China

  • 4.

    China Coal Energy Research Institute Co., Ltd., Xi'an 710054, China

  • 5.

    Ordos Yihua Mining Resources Co., Ltd., Ordos 017399, China

  • 6.

    Beijing Anke Xingye Technology Co., Ltd., Beijing 102200, China

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  • Received Date: September 12, 2023
  • Available Online: March 24, 2024
    Graphical Abstract
    • Abstract
  • The instability-induced rockburst of thick hard rock stratum-coal pillar structure is a typical rockburst mode in Ordos deep mining area, and its mechanism is still unclear. Taking the 30202 working face of a mine in Ordos deep mining area as the engineering background, the instability-induced rockburst mechanism of thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height is studied by means of the theoretical analysis, numerical simulation and field measurement, and the following conclusions are drawn: The spatial movement characteristics of thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height are discussed. The mechanism of instability-induced impact of the thick and hard rock stratum-coal pillar structure is revealed, i.e., the foundation stress of the section coal pillar comes from the self-weight of the in-plane thick and hard rock stratum group and the adjacent mined-out area, when it reaches the strength limit, the in-plane thick and hard rock stratum breaks in a "W" shape and transmits additional stress, and when the superimposed stress of the section coal pillar exceeds its failure threshold, local or even whole instability impact occurs. It is found through the numerical simulation that the load transmitted by the "W"-shaped twice breaking motion of the thick and hard strata group is the main stress source of the instability impact of the coal pillar near the working face. The control system of instability-induced impact of the thick hard rock stratum-coal pillar structure in deep fully mechanized mining face with large mining height is designed and implemented, including strong unloading of bearing coal pillar, strong support in disturbed areas and strong control of advancing speed. The effectiveness evaluation verifies that the anti-impact system can ensure the safe mining of the working face.
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    • References (20)
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