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Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting

Author

Listed:
  • Yajun Wang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
    All authors contributed equally to this work.)

  • Yubing Gao

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
    All authors contributed equally to this work.)

  • Eryu Wang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

  • Manchao He

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China)

  • Jun Yang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
    School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

Abstract

A new non-pillar mining technology, gob-side entry retaining by roof cutting (GERRC), different from the conventional gob-side entry retaining formed by a roadside filling support, is introduced in this study. In the new technology, roof cutting is conducted so that the roof plate forms a short cantilever beam structure within a certain range above the retained entry, thus changing the stress boundary condition of the roof structure. To explore the deformation characteristics of the roof under this special condition, a short cantilever beam mechanical model was established and solved using energy theory and displacement variational methods. Meanwhile, a theoretical and analytical control solution for roof deformation was obtained and verified via field-measured results. Based on the aforementioned calculation, the relationship between the roof deformation and main influence parameters was explored. It was concluded that the rotation of the upper main roof and width of the retained entry had the most significant impacts on roof deformation. Bolt and cable support and temporary support in the entry had a non-obvious influence on the roof deformation and could not prevent the given deformation that was caused by the rotation of the upper main roof. Based on comprehensive theoretical analysis and calculation results, ideas and countermeasures to control short cantilever roof deformation—that is, designing a reasonable height of roof cutting and a controlled width of retaining entry—were proposed and tested. Field monitoring shows that the entry control effects were satisfactory.

Suggested Citation

  • Yajun Wang & Yubing Gao & Eryu Wang & Manchao He & Jun Yang, 2018. "Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting," Energies, MDPI, vol. 11(3), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:627-:d:135834
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    References listed on IDEAS

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    1. Yubing Gao & Dongqiao Liu & Xingyu Zhang & Manchao He, 2017. "Analysis and Optimization of Entry Stability in Underground Longwall Mining," Sustainability, MDPI, vol. 9(11), pages 1-19, November.
    2. Hong-sheng Wang & Dong-sheng Zhang & Lang Liu & Wei-bin Guo & Gang-wei Fan & KI-IL Song & Xu-feng Wang, 2016. "Stabilization of Gob-Side Entry with an Artificial Side for Sustaining Mining Work," Sustainability, MDPI, vol. 8(7), pages 1-17, July.
    3. 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.
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    Cited by:

    1. Zimin Ma & Jiong Wang & Manchao He & Yubing Gao & Jinzhu Hu & Qiong Wang, 2018. "Key Technologies and Application Test of an Innovative Noncoal Pillar Mining Approach: A Case Study," Energies, MDPI, vol. 11(10), pages 1-22, October.
    2. Jianhang Chen & Ziwei Ding & Saisai Wu & Junwen Zhang, 2022. "Studying the Bond Performance of Full-Grouting Rock Bolts Based on the Variable Controlling Method," Energies, MDPI, vol. 15(9), pages 1-15, April.
    3. 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.
    4. Jun Yang & Hongyu Wang & Yajun Wang & Binhui Liu & Shilin Hou & Yu Cheng, 2019. "Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position," Sustainability, MDPI, vol. 11(22), pages 1-16, November.
    5. 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.
    6. Zhenqian Ma & Dongyue Zhang & Yunqin Cao & Wei Yang & Biao Xu, 2022. "Study of Key Technology of Gob-Side Entry Retention in a High Gas Outburst Coal Seam in the Karst Mountain Area," Energies, MDPI, vol. 15(11), pages 1-21, June.
    7. 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.
    8. Zhibiao Guo & Haohao Wang & Zimin Ma & Pengfei Wang & Xiaohui Kuai & Xianzhe Zhang, 2021. "Research on the Transmission of Stresses by Roof Cutting near Gob Rocks," Energies, MDPI, vol. 14(5), pages 1-24, February.
    9. Erhu Bai & Wenbing Guo & Dongsheng Zhang & Yi Tan & Mingjie Guo & Gaobo Zhao, 2019. "Using the Magnetotelluric Method for Detecting Aquifer Failure Characteristics under High-Intensity Mining of Thick Coal Seams," Energies, MDPI, vol. 12(22), pages 1-14, November.
    10. 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.
    11. Zhibiao Guo & Weitao Li & Songyang Yin & Dongshan Yang & Zhibo Ma, 2021. "An Innovative Technology for Monitoring the Distribution of Abutment Stress in Longwall Mining," Energies, MDPI, vol. 14(2), pages 1-22, January.
    12. Qizhi Chen & Baoping Zou & Zhigang Tao & Manchao He & Bo Hu, 2023. "Construction and Application of an Intelligent Roof Stability Evaluation System for the Roof-Cutting Non-Pillar Mining Method," Sustainability, MDPI, vol. 15(3), pages 1-17, February.
    13. 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.
    14. Lifeng Li & Gan Li & Weili Gong & Jiong Wang & Huilin Deng, 2019. "Energy Evolution Pattern and Roof Control Strategy in Non-Pillar Mining Method of Goaf-Side Entry Retaining by Roof Cutting—A Case Study," Sustainability, MDPI, vol. 11(24), pages 1-18, December.
    15. Shixing Cheng & Zhanguo Ma & Peng Gong & Kelong Li & Ning Li & Tuo Wang, 2020. "Controlling the Deformation of a Small Coal Pillar Retaining Roadway by Non-Penetrating Directional Pre-Splitting Blasting with a Deep Hole: A Case Study in Wangzhuang Coal Mine," Energies, MDPI, vol. 13(12), pages 1-23, June.

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