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Roof Strata Behavior and Support Resistance Determination for Ultra-Thick Longwall Top Coal Caving Panel: A Case Study of the Tashan Coal Mine

Author

Listed:
  • Jun Guo

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Guorui Feng

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Pengfei Wang

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Tingye Qi

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

  • Xiaorong Zhang

    (Datong Coal Mine Group Company, Datong 037003, China)

  • Yonggan Yan

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China
    Shanxi Province Research Center of Green Mining Engineering Technology, Shanxi 030024, China)

Abstract

The Longwall Top Coal Caving (LTCC) method has greatly improved the production of ultra-thick underground coal resources. However, face fall and support closure have been becoming highly frequent accidents at the working face, and seriously threaten the safety of miners. The key to avoiding these problems is to reveal the structural evolution of the roof strata and then choose a reasonable working resistance for the hydraulic supports. According to physical modeling, theoretical analysis and field observation of the LTCC panel, four kinds of structural models can be found and defined, in consideration of the coincident movement of key strata (KS) and the mining activities of upper face in overburden strata. The KS are performed as cantilever structures, hinged structures and voussoir beam structures at three different positions in roof strata. The structural characteristics of the KS and its movement laws are shown in the four structural modes. The loads acting on the support in the four typical structural models are also analyzed. The structural instability of the broken roof strata on the upper caving panel caused by the lower ultra-thick coal seam mining is considered to be the main reason for its face’s falls and support failures. Consequently, a method is proposed for calculating the working resistance of the support in the LTCC face, which is verified by the mining pressure monitoring in practice.

Suggested Citation

  • Jun Guo & Guorui Feng & Pengfei Wang & Tingye Qi & Xiaorong Zhang & Yonggan Yan, 2018. "Roof Strata Behavior and Support Resistance Determination for Ultra-Thick Longwall Top Coal Caving Panel: A Case Study of the Tashan Coal Mine," Energies, MDPI, vol. 11(5), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1041-:d:142989
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    References listed on IDEAS

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    1. Nan Zhou & Jixiong Zhang & Hao Yan & Meng Li, 2017. "Deformation Behavior of Hard Roofs in Solid Backfill Coal Mining Using Physical Models," Energies, MDPI, vol. 10(4), pages 1-20, April.
    2. Peng Huang & Feng Ju & Kashi Vishwanath Jessu & Meng Xiao & Shuai Guo, 2017. "Optimization and Practice of Support Working Resistance in Fully-Mechanized Top Coal Caving in Shallow Thick Seam," Energies, MDPI, vol. 10(9), pages 1-12, September.
    3. Wei-bin Guo & Hong-sheng Wang & Guo-wei Dong & Lei Li & Yao-guang Huang, 2017. "A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions," Sustainability, MDPI, vol. 9(6), pages 1-17, June.
    4. Meng Li & Nan Zhou & Jixiong Zhang & Zhicheng Liu, 2017. "Numerical Modelling of Mechanical Behavior of Coal Mining Hard Roofs in Different Backfill Ratios: A Case Study," Energies, MDPI, vol. 10(7), pages 1-18, July.
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    Cited by:

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    2. Yang Yu & Xiangyu Wang & Jianbiao Bai & Lianying Zhang & Hongchun Xia, 2020. "Deformation Mechanism and Stability Control of Roadway Surrounding Rock with Compound Roof: Research and Applications," Energies, MDPI, vol. 13(6), pages 1-19, March.
    3. Wenlong Shen & Meng Wang & Zhengzheng Cao & Faqiang Su & Hua Nan & Xuelong Li, 2019. "Mining-Induced Failure Criteria of Interactional Hard Roof Structures: A Case Study," Energies, MDPI, vol. 12(15), pages 1-17, August.
    4. Yubing Huang & Bei Jiang & Yukun Ma & Huayong Wei & Jincheng Zang & Xiang Gao, 2021. "Study on Asymmetric Failure and Control Measures of Lining in Deep Large Section Chamber," Energies, MDPI, vol. 14(14), pages 1-14, July.

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