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Research on the Mechanism and Control Technology of Coal Wall Sloughing in the Ultra-Large Mining Height Working Face

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  • Xuelong Li

    (State Key Laboratory of Mining Disaster Prevention and Control, College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Xinyuan Zhang

    (State Key Laboratory of Mining Disaster Prevention and Control, College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Wenlong Shen

    (State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Qingdong Zeng

    (State Key Laboratory of Mining Disaster Prevention and Control, College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Peng Chen

    (School of Mine Safety, North China Institute of Science and Technology, Langfang 101601, China)

  • Qizhi Qin

    (Shandong Energy Group Co., Ltd., Jinan 250014, China)

  • Zhen Li

    (State Key Laboratory of Mining Disaster Prevention and Control, College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

One of the primary factors affecting safe and effective mining in fully mechanized mining faces with large mining heights is coal wall sloughing. This paper establishes the mechanical model of the coal wall and uses the deflection theory for the mechanics of materials to find the maximum point of the deflection of the coal wall, which is the most easily deformed and damaged during the mining process, based on the mining production conditions of the 12-2up108 working face in the Jinjitan Coal Mine. In order to simulate the characteristics of the coal wall in the large mining height working face at various mining heights, the FLAC-3D numerical method was used. The stability of the mining area was assessed in conjunction with the multi-factor fuzzy comprehensive evaluation mathematical model, and the corresponding control of the coal wall was suggested. The study demonstrates that: (1) The working surface at Jinjitan Coal Mine 112-2up108 is a typical drum-out sloughing. The coal wall is most likely to sustain damage at the point where it contacts the roof when the frictional resistance between the coal seam and the roof and floor is less than the uniform load, and at 0.578 times the mining height when the frictional resistance between the coal seam and the roof and floor is greater than the uniform load. (2) In the working face with a large mining height, mining height of the coal wall is one of the significant influencing factors. With increasing mining height, the coal wall’s height also rises nonlinearly, as does the depth of the coal wall in the working face with the large mining height. The growth is linear. The coal wall’s maximum deflection value point moves up and the slab’s height significantly increases when the mining height exceeds 7.5 m. (3) The Jinjitan Coal Mine should be supported by a pressurized and enhanced composite support bracket with a support force greater than 0.245 MPa and a support plate of 3500 mm because it belongs to a Class I stable coal wall, according to a thorough evaluation of a multi-factor fuzzy mathematical model. The working face’s mining pressure is continuously and dynamically monitored, and the stress is released in a timely manner to prevent the occurrence of dynamic disasters.

Suggested Citation

  • Xuelong Li & Xinyuan Zhang & Wenlong Shen & Qingdong Zeng & Peng Chen & Qizhi Qin & Zhen Li, 2023. "Research on the Mechanism and Control Technology of Coal Wall Sloughing in the Ultra-Large Mining Height Working Face," IJERPH, MDPI, vol. 20(1), pages 1-17, January.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:1:p:868-:d:1023469
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    References listed on IDEAS

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    1. Sheng Wang & Xuelong Li & Qizhi Qin, 2022. "Study on Surrounding Rock Control and Support Stability of Ultra-Large Height Mining Face," Energies, MDPI, vol. 15(18), pages 1-20, September.
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    Cited by:

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    2. Fenghui Li & Yunhai Cheng & Xiufeng Zhang & Dong Li & Shunjie Huang, 2023. "A Study on Disasters Induced by Head-On Ejection in High-Speed Driving under the Influence of Roof Drainage," Sustainability, MDPI, vol. 15(11), pages 1-15, May.
    3. Xiaojun Feng & Zichuang Ai & Xuebo Zhang & Qilei Wei & Chenjun Du & Qiming Zhang & Chuan Deng, 2023. "Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam," Sustainability, MDPI, vol. 15(12), pages 1-17, June.
    4. Huichen Xu & Xiaoming Sun & Yong Zhang & Chengwei Zhao & Chengyu Miao & Dong Wang, 2023. "Creep Characteristics of Layered Rock Masses after Water Absorption Due to Structural Effects," IJERPH, MDPI, vol. 20(5), pages 1-18, February.
    5. Liu, Shumin & Sun, Haitao & Zhang, Dongming & Yang, Kun & Li, Xuelong & Wang, Dengke & Li, Yaning, 2023. "Experimental study of effect of liquid nitrogen cold soaking on coal pore structure and fractal characteristics," Energy, Elsevier, vol. 275(C).
    6. Zhenguo Yan & Huachuan Wang & Huicong Xu & Jingdao Fan & Weixi Ding, 2024. "Construction and Application of an Intelligent Prediction Model for the Coal Pillar Width of a Fully Mechanized Caving Face Based on the Fusion of Multiple Physical Parameters," Sustainability, MDPI, vol. 16(3), pages 1-14, January.
    7. Shouguo Yang & Ning Xu & Xiaofei Zhang, 2023. "Numerical Simulation Study on the Evolution Law of Stress and Crack in Coal Seam Hydraulic Fracturing," Sustainability, MDPI, vol. 15(14), pages 1-13, July.

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