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Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam

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  • Xinshuai Shi

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan)

  • Hongwen Jing

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Zhenlong Zhao

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yuan Gao

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yuanchao Zhang

    (Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan)

  • Ruodi Bu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

In this paper, a combination of physical model tests and numerical simulations were carried out to explore the overlying strata movement laws, failure mechanism, and cracks evolution of the gob-side entry driven in a thick coal seam. The physical experimental results indicated that the hanging cantilever beam was easily developed above the coal pillar after mining out the 2101 panel, resulting in a larger and stronger stress concentration. The overburden loads acting on the coal pillar can be greatly released after the hanging roof strata were cut down with an 18 m cutting line. Additionally, we adopted Universal Discrete Element Code (UDEC) software to investigate the deformation and crack evolution mechanism of the gob-side entry under different conditions. The primary-supported roadway underwent severe deformation, filling with a great quantity of tensile and shear cracks to the inner coal pillar. Both the physical and numerical results proved that the optimized-support parameters combined with roof-cutting measures could effectively guarantee the stability of the gob-side entry. This research can provide valuable guidance for the stability control of the gob-side entry in mines under similar conditions.

Suggested Citation

  • Xinshuai Shi & Hongwen Jing & Zhenlong Zhao & Yuan Gao & Yuanchao Zhang & Ruodi Bu, 2020. "Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam," Energies, MDPI, vol. 13(20), pages 1-24, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5425-:d:430507
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    References listed on IDEAS

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    1. Deyuan Fan & Xuesheng Liu & Yunliang Tan & Shilin Song & Qingheng Gu & Lei Yan & Qiang Xu, 2019. "Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study," Energies, MDPI, vol. 12(10), pages 1-25, May.
    2. Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
    3. Jinzhu Hu & Manchao He & Jiong Wang & Zimin Ma & Yajun Wang & Xingyu Zhang, 2019. "Key Parameters of Roof Cutting of Gob-Side Entry Retaining in a Deep Inclined Thick Coal Seam with Hard Roof," Energies, MDPI, vol. 12(5), pages 1-19, March.
    4. Xingen Ma & Manchao He & Jiong Wang & Yubing Gao & Daoyong Zhu & Yuxing Liu, 2018. "Mine Strata Pressure Characteristics and Mechanisms in Gob-Side Entry Retention by Roof Cutting under Medium-Thick Coal Seam and Compound Roof Conditions," Energies, MDPI, vol. 11(10), pages 1-25, September.
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    Cited by:

    1. Sylwester Rajwa & Tomasz Janoszek & Janina Świątek & Andrzej Walentek & Dominik Bałaga, 2022. "Numerical Simulation of the Impact of Unmined Longwall Panel on the Working Stability of a Longwall Using UDEC 2D—A Case Study," Energies, MDPI, vol. 15(5), pages 1-19, February.
    2. Guang Li & Fengshan Ma & Jie Guo & Haijun Zhao, 2021. "Case Study of Roadway Deformation Failure Mechanisms: Field Investigation and Numerical Simulation," Energies, MDPI, vol. 14(4), pages 1-15, February.
    3. Shengrong Xie & Fangfang Guo & Yiyi Wu, 2022. "Control Techniques for Gob-Side Entry Driving in an Extra-Thick Coal Seam with the Influence of Upper Residual Coal Pillar: A Case Study," Energies, MDPI, vol. 15(10), pages 1-21, May.
    4. Pengze Liu & Lin Gao & Pandong Zhang & Guiyi Wu & Yongyin Wang & Ping Liu & Xiangtao Kang & Zhenqian Ma & Dezhong Kong & Sen Han, 2022. "Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams," Energies, MDPI, vol. 15(10), pages 1-13, May.

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