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Control Techniques for Gob-Side Entry Driving in an Extra-Thick Coal Seam with the Influence of Upper Residual Coal Pillar: A Case Study

Author

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  • Shengrong Xie

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Fangfang Guo

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Yiyi Wu

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

Abstract

In multi-seam mining, the residual coal pillar (RCP) in the upper gob has an important influence on the layout of the roadway in the lower coal seam. At present, few papers have studied the characteristics of the surrounding rock of gob-side entry driving (GED) with different coal pillar widths under the influence of RCP. This research contributes to improving the recovery rate of the extra-thick coal seam under this condition. The main research contents were as follows: (1) The mechanical parameters of the rock and coal mass were obtained using laboratory experiments coupled with Roclab software. These parameters were substituted into the established main roof structure mechanics model to derive the breakage position of the main roof with the influence of RCP, and the rationality of the calculation results was verified by borehole-scoping. (2) Based on numerical simulation, the evolution laws of the lateral abutment stress in the lower working face at different relative distances to the RCP were studied. FLAC3D was used to study the whole space-time evolution law of deviatoric stress and plastic zone of GED during driving and retreating periods with various coal pillar widths under the influence of RCP. (3) The plasticization factor P was introduced to quantify the evolution of the plastic zone in different subdivisions of the roadway surrounding rock, so as to better evaluate the bearing performance of the surrounding rock, which enabled a more effective determination of the reasonable coal pillar width. The field application results showed that it was feasible to set up the gob-side entry with an 8 m coal pillar below the RCP. The targeted support techniques with an 8 m coal pillar could effectively control the surrounding rock deformation.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3620-:d:816183
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    References listed on IDEAS

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    1. Xiaoyu Liu & Manchao He & Jiong Wang & Zimin Ma, 2021. "Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof," Energies, MDPI, vol. 14(2), pages 1-14, January.
    2. Kai Wang & Yanli Huang & Huadong Gao & Wen Zhai & Yongfeng Qiao & Junmeng Li & Shenyang Ouyang & Wei Li, 2020. "Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar," Energies, MDPI, vol. 13(13), pages 1-20, July.
    3. Rui Wu & Qingyuan He & Joung Oh & Zecheng Li & Chengguo Zhang, 2018. "A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems," Energies, MDPI, vol. 11(8), pages 1-24, August.
    4. 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.
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    Cited by:

    1. Dongdong Chen & Fangfang Guo & Zijian Li & Xiang Ma & Shengrong Xie & Yiyi Wu & Zhiqiang Wang, 2022. "Study on the Influence and Control of Stress Direction Deflection and Partial-Stress Boosting of Main Roadways Surrounding Rock and under the Influence of Multi-Seam Mining," Energies, MDPI, vol. 15(21), pages 1-24, November.
    2. Changhao Shan & Shenggen Cao & Zeyu Zhang & Kewen Lin & Jialong Sun, 2023. "Numerical Investigation on the Yield Pillar Bearing Capacity under the Two-End-Type Cable Reinforcement," Energies, MDPI, vol. 16(18), pages 1-17, September.
    3. Shengrong Xie & Yiyi Wu & Fangfang Guo & Hang Zou & Dongdong Chen & Xiao Zhang & Xiang Ma & Ruipeng Liu & Chaowen Wu, 2022. "Application of Pre-Splitting and Roof-Cutting Control Technology in Coal Mining: A Review of Technology," Energies, MDPI, vol. 15(17), pages 1-20, September.

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