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Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China

Author

Listed:
  • Zhu Li

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Jialin Xu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Shengchao Yu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Jinfeng Ju

    (IoT Perception Mine Research Center, China University of Mining and Technology, Xuzhou 221008, China)

  • Jingmin Xu

    (Department of Civil Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK)

Abstract

Longwall chock support failures seriously restrain the safety and high-efficiency of mining of extra thick coal seams, as well as causing a great waste of coal resources. During longwall top-coal caving (LTCC), the influential effect of the properties and the movement regulation of top-coal on strata behavior cannot be ignored, since the top-coal is the medium through which the load of the overlying strata is transferred to the chock supports. Taking Datong coalfield as an example, the mechanism of a chock support failure in the LTCC face was investigated. Research findings indicated that the hard top-coal and insufficient chock support capacity were primary reasons for chock support failure accidents. On account of the field-measured results, a new method to determine support capacity was proposed, which fully took the impact of the top-coal strength into consideration. The calculation revealed that the required support capacity had exceeded the existing production maximum, at about 22,000 KN. Since it was unrealistic to simply increase chock support capacity, other approaches, according to the theoretical analysis, were proposed, such as lowering the integrity and strength of the top-coal, and upgrading its crushing effect to weaken the support load effectively during the weighting period, which reduces the likelihood of chock support accidents occurring. Based on this, hydraulic fracturing for hard top-coal and optimization of the caving process (chock supports raised up and down repeatedly by manual operation before moving forward) were presented. The proposed solutions were successfully applied in LTCC-west8101 for subsequent mining and achieved substantial benefits. The above research provides valuable references and ideas for the control of strata behavior to ensure safe and highly efficient mining in extremely thick and hard coal seams with the LTCC method.

Suggested Citation

  • Zhu Li & Jialin Xu & Shengchao Yu & Jinfeng Ju & Jingmin Xu, 2018. "Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China," Energies, MDPI, vol. 11(2), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:288-:d:128576
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    References listed on IDEAS

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    1. 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.
    2. Yiyu Lu & Yugang Cheng & Zhaolong Ge & Liang Cheng & Shaojie Zuo & Jianyu Zhong, 2016. "Determination of Fracture Initiation Locations during Cross-Measure Drilling for Hydraulic Fracturing of Coal Seams," Energies, MDPI, vol. 9(5), pages 1-13, May.
    3. Xie, H. & Zhou, H.W., 2008. "Application of fractal theory to top-coal caving," Chaos, Solitons & Fractals, Elsevier, vol. 36(4), pages 797-807.
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    Cited by:

    1. Haojie Xue & Yubing Gao & Xingyu Zhang & Xichun Tian & Haosen Wang & Di Yuan, 2019. "Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining," Energies, MDPI, vol. 12(24), pages 1-19, December.
    2. Yi Yang & Xinwei Li & Huamin Li & Dongyin Li & Ruifu Yuan, 2020. "Deep Q-Network for Optimal Decision for Top-Coal Caving," Energies, MDPI, vol. 13(7), pages 1-14, April.
    3. Bin Song & Shuai Zhang & Dongsheng Zhang & Gangwei Fan & Wei Yu & Qiang Zhao & Shuaishuai Liang, 2018. "Inorganic Cement Grouting for Reinforcing Triangular Zone of Highly Gassy Coal Face with Large Mining Height," Energies, MDPI, vol. 11(10), pages 1-23, September.
    4. Zhanjie Feng & Wenbing Guo & Feiya Xu & Daming Yang & Weiqiang Yang, 2019. "Control Technology of Surface Movement Scope with Directional Hydraulic Fracturing Technology in Longwall Mining: A Case Study," Energies, MDPI, vol. 12(18), pages 1-18, September.
    5. Dengfeng Yang, 2021. "Analysis of Fracture Mechanics Theory of the First Fracture Mechanism of Main Roof and Support Resistance with Large Mining Height in a Shallow Coal Seam," Sustainability, MDPI, vol. 13(4), pages 1-24, February.
    6. Ningbo Zhang & Changyou Liu & Xiaojie Wu & Tingxiang Ren, 2018. "Dynamic Random Arching in the Flow Field of Top-Coal Caving Mining," Energies, MDPI, vol. 11(5), pages 1-14, May.

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