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Research on the Transmission of Stresses by Roof Cutting near Gob Rocks

Author

Listed:
  • Zhibiao Guo

    (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)

  • Haohao Wang

    (School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

  • Zimin Ma

    (School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255000, China)

  • Pengfei Wang

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Department of Mining, Metals and Materials Engineering, McGill University, Montreal, QC 3450, Canada)

  • Xiaohui Kuai

    (School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

  • Xianzhe Zhang

    (School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China)

Abstract

Pressure relief for roadways retained by roof cutting is essentially caused by stress transfer. In this paper, the stress transfer mechanism of 16011 tail entry with roof cutting in Zhaogu No.1 coal mine is studied from the following two aspects: the change of the tail entry surrounding the rock structure and the interaction between the roadway surrounding rock and supporting structures. It is found by numerical simulation that roof cutting can significantly reduce the magnitude of roadway roof stress, transferring the concentrated stress induced by excavation and mining away from the roadway, and forming an obvious triangle pressure relief area in front of the working face. In the early stage after mining, most of the overburden load is transferred downward through the immediate roof of the roadway. With the movement of overlying strata, the stress, initially transferred to the immediate roof strata, is gradually transferred to the gob, and the calculation formula and influence factors of the transferred stress are derived. In addition, through the establishment of the mechanical model and theoretical calculation of the key rock block of the main roof, the roadside support resistance required to ensure the stability of the main roof block is determined. The field monitoring shows that the lateral pressure coefficient of the roadside caved rocks is 0.36 and the constant resistance and large deformation anchor cable (CRLDAC) and the roadway temporary support play roles of conduction and control in the process of stress transfer, and effectively ensure the stability of surrounding rock during the service life of the retained gob-side entry by roof cutting (RGERC).

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1237-:d:505045
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    References listed on IDEAS

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    1. 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.
    2. Peng Gong & Zhanguo Ma & Xiaoyan Ni & Ray Ruichong Zhang, 2017. "Floor Heave Mechanism of Gob-Side Entry Retaining with Fully-Mechanized Backfilling Mining," Energies, MDPI, vol. 10(12), pages 1-19, December.
    3. 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.
    4. 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.
    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. Peng Li & Xingping Lai & Peilin Gong & Chao Su & Yonglu Suo, 2020. "Mechanisms and Applications of Pressure Relief by Roof Cutting of a Deep-Buried Roadway near Goafs," Energies, MDPI, vol. 13(21), pages 1-16, November.
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    Cited by:

    1. Wensheng Wei & Guojun Zhang & Chunyuan Li & Wenshuai Zhang & Yupeng Shen, 2023. "Mechanism and Control of Asymmetric Floor Heave in Deep Roadway Disturbed by Roof Fracture," Sustainability, MDPI, vol. 15(8), pages 1-21, April.
    2. 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.
    3. Ling Dong & Dong Wang & Xiaoming Sun & Yujing Jiang & Hengjie Luan & Huichen Xu & Baocheng Li & Feng Cai, 2023. "Large-Deformation Failure Mechanism and Stability Control of a Swelling Soft Rock Roadway in a Sea Area: A Case Study in Eastern China," Sustainability, MDPI, vol. 15(6), pages 1-12, March.

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