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Study on Surrounding Rock Control and Support Stability of Ultra-Large Height Mining Face

Author

Listed:
  • Sheng Wang

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

  • Xuelong Li

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

  • Qizhi Qin

    (State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
    Yankuang Group Co., Ltd., Zoucheng 273500, China)

Abstract

Surrounding rock control and support stability in the process of coal seam mining in ultra-large height mining face are the key to normal mine operation. In this study, the roof movement and deformation of an ultra-large height mining face are analyzed, and the working resistance of the ultra-large height mining face is obtained by introducing the equivalent immediate roof. By analyzing the coal wall spalling, the multiple positions of the spalling and the required support force of the support are obtained. At the same time, ultra-large height supports are more prone to instability problems. In this study, the stability of the ultra-large height supports was analyzed by establishing a mechanical model. The results show that: 1. The overturning limit angle of support has a hyperbolic relationship with the center of gravity. 2. Under the condition of ultra-large height, the increase in the base width of the bracket significantly improves the stability of the supports. 3. The sliding limit angle of support is positively correlated with the support load and the friction coefficient between the support and the floor. The above conclusions can provide guidance on the selection of supports and the adoption of measures to enhance the stability of the supports during use under ultra-large height conditions. The working resistance of the ultra-large height supports in the 108 mining face of the Jinjitan Coal Mine was monitored. The monitoring results show that: The average resistance of the supports is 22.6 MPa. The selected supports can meet the stability requirements of the working face support. The frequency of mining resistance in 0~5 MPa accounts for 28.38%, which indicates that some supports are insufficient for the initial support force during the moving process. Furthermore, the stability of the supports can be enhanced by adjusting the moving process. This study provides a reference for the selection of supports in ultra-large height mining faces and proposes measures to enhance the stability of the supports, which provides guidance for the safe mining of coal in ultra-large height mining faces.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6811-:d:917875
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    References listed on IDEAS

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    1. Du, Tao & Nie, Wen & Chen, Dawei & Xiu, Zihao & Yang, Bo & Liu, Qiang & Guo, Lidian, 2020. "CFD modeling of coal dust migration in an 8.8-meter-high fully mechanized mining face," Energy, Elsevier, vol. 212(C).
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    Cited by:

    1. Qiuping Li & Jie Liu & Shouqing Lu & Zaiquan Wang & Hao Wang & Yimeng Wu & Yupu Wang & Di Ying & Mingjie Li, 2022. "Influence of Confining Pressure on Nonlinear Failure Characteristics of Coal Subjected to Triaxial Compression," IJERPH, MDPI, vol. 20(1), pages 1-17, December.
    2. Xiaoyan Sun & Qican Ran & Hao Liu & Yanhao Ning & Tengfei Ma, 2023. "Characteristics of Stress-Displacement-Fracture Multi-Field Evolution around Gas Extraction Borehole," Energies, MDPI, vol. 16(6), pages 1-21, March.
    3. Mingkun Pang & Hongyu Pan & Hang Zhang & Tianjun Zhang, 2022. "Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes," IJERPH, MDPI, vol. 19(20), pages 1-21, October.
    4. Pang, Mingkun & Pan, Hongyu & Ji, Bingnan & Zhang, Hang & Zhang, Tianjun, 2023. "Experimental investigation of flow regime transition characteristics of fractured coal bodies around gas extraction boreholes," Energy, Elsevier, vol. 270(C).
    5. Wenlong Li & Shihao Tu & Hongsheng Tu & Xun Liu & Kaijun Miao & Hongbin Zhao & Jieyang Ma & Long Tang & Yan Li, 2022. "A New Method to Assess Thick, Hard Roof-Induced Rock Burst Risk Based on Mining Speed Effect on Key Energy Strata," Sustainability, MDPI, vol. 14(22), pages 1-19, November.
    6. Zheyuan Feng & Qi Xu & Xinyu Luo & Ruyu Huang & Xin Liao & Qiang Tang, 2022. "Microstructure, Deformation Characteristics and Energy Analysis of Mudstone under Water Absorption Process," Energies, MDPI, vol. 15(20), pages 1-17, October.
    7. 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.
    8. Rui Yu & Jiawei Qian & Liang Liu & Huasheng Zha & Nan Li, 2022. "Microseismic Precursors of Coal Mine Water Inrush Characterized by Different Waveforms Manifest as Dry to Wet Fracturing," IJERPH, MDPI, vol. 19(21), pages 1-12, November.
    9. Jian Hao & Anfa Chen & Xuelong Li & Hua Bian & Guanghua Zhou & Zhenguo Wu & Linjun Peng & Jianquan Tang, 2022. "Analysis of Surrounding Rock Control Technology and Its Application on a Dynamic Pressure Roadway in a Thick Coal Seam," Energies, MDPI, vol. 15(23), pages 1-23, November.
    10. Li Cheng & Qinzheng Wu & Haotian Li & Kexu Chen & Chunlong Wang & Xingquan Liu & Xuelong Li & Jingjing Meng, 2022. "Safety and Protection Measures of Underground Non-Coal Mines with Mining Depth over 800 m: A Case Study in Shandong, China," Sustainability, MDPI, vol. 14(20), pages 1-16, October.

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