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The Stress Evolution of Adjacent Working Faces Passing through an Abandoned Roadway and the Damage Depth of the Floor

Author

Listed:
  • Song Shi

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Yichen Miao

    (Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China)

  • Haikuan Wu

    (School of Emergency Science, Xihua University, Chengdu 610039, China)

  • Zhipeng Xu

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

  • Changwu Liu

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China)

Abstract

An advanced break or a vast region of pressurisation may occur when the working face passes through an abandoned roadway, resulting in a roof falling or water inrush. The stress evolution of the working face passing through an abandoned roadway in a coal mine was comprehensively discussed using theoretical analysis, numerical simulation, and field monitoring. In this study, the calculated critical width of the abandoned roadway where the main roof was bound to an advanced break was 5.4 m. Reducing the suspended length of the main roof is beneficial to the stability of the working face’s passage across the abandoned roadway. The maximum abutment stress on the roof occurred at the working face through a semi-abandoned roadway, reaching 44.3 MPa. Subsequently, it decreased sharply until the working face completely passed and returned to the normal level. The damage depths of the floor strata from the field monitoring were 15 and 20 m, which showed that the use of hydraulic fracturing technology combined with floor grouting and hydraulic support for the abandoned roadway was proposed to stabilise the working face for safe mining.

Suggested Citation

  • Song Shi & Yichen Miao & Haikuan Wu & Zhipeng Xu & Changwu Liu, 2022. "The Stress Evolution of Adjacent Working Faces Passing through an Abandoned Roadway and the Damage Depth of the Floor," Energies, MDPI, vol. 15(16), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:16:p:5824-:d:885498
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    References listed on IDEAS

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    1. Weidong Pan & Shaopeng Zhang & Yi Liu, 2020. "Safe and Efficient Coal Mining Below the Goaf: A Case Study," Energies, MDPI, vol. 13(4), pages 1-15, February.
    2. Fan, Jinyang & Liu, Wei & Jiang, Deyi & Chen, Junchao & Ngaha Tiedeu, William & Chen, Jie & JJK, Deaman, 2018. "Thermodynamic and applicability analysis of a hybrid CAES system using abandoned coal mine in China," Energy, Elsevier, vol. 157(C), pages 31-44.
    3. Yuantian Sun & Guichen Li & Junfei Zhang & Junbo Sun & Jiandong Huang & Reza Taherdangkoo, 2021. "New Insights of Grouting in Coal Mass: From Small-Scale Experiments to Microstructures," Sustainability, MDPI, vol. 13(16), pages 1-17, August.
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    Cited by:

    1. Lele Xiao & Fan Li & Chao Niu & Gelian Dai & Qian Qiao & Chengsen Lin, 2022. "Evaluation of Water Inrush Hazard in Coal Seam Roof Based on the AHP-CRITIC Composite Weighted Method," Energies, MDPI, vol. 16(1), pages 1-20, December.

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