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Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining

Author

Listed:
  • Yu Xiong

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Dezhong Kong

    (College of Mining, Guizhou University, Guiyang 550025, China
    Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China)

  • Zhanbo Cheng

    (School of Engineering, University of Warwick, Coventry CV4 7AL, UK)

  • Zhijie Wen

    (Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
    College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Zhenqian Ma

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Guiyi Wu

    (College of Mining, Guizhou University, Guiyang 550025, China)

  • Yong Liu

    (College of Mining, Guizhou University, Guiyang 550025, China)

Abstract

In order to solve the problems of roadway stability and easy instability under repeated mining of close-distance coal seam groups, the mechanism and control technology of surrounding rock instability under repeated mining were studied via indoor testing, field testing, physical similarity simulation experiment, and numerical simulation. The results show that the surrounding rock of roadway has low strength, low bearing capacity, and poor self-stabilization ability, and it is vulnerable to engineering disturbances and fragmentation. Affected by the disturbance under repeated mining, the roadway surrounding rock cracks are developed and the sensitivity is strong, and it is prone to large-scale loose and destroyed. The location of the roadway is unreasonable, and the maximum principal stress of the roadway is 3.1 times of the minimum principal stress, which is quite different. Thus, under a large horizontal stress, the surrounding rock undergoes long-range expansion deformation. On the basis of this research, the direction and emphasis of stability control of roadway surrounding rock under repeated mining of coal seam groups in close-distance are shown. A repair scheme (i.e., long bolt + high-strength anchor cable + U-shaped steel + grouting) is proposed, and reduces the risk of roadway instability.

Suggested Citation

  • Yu Xiong & Dezhong Kong & Zhanbo Cheng & Zhijie Wen & Zhenqian Ma & Guiyi Wu & Yong Liu, 2021. "Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining," Energies, MDPI, vol. 14(16), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:5193-:d:619477
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    References listed on IDEAS

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    1. Qingxian Huang & Xufeng Wang & Xuyang Chen & Dongdong Qin & Zechao Chang, 2020. "Evolution of Interior and Exterior Bearing Structures of the Deep-Soft-Rock Roadway: From Theory to Field Test in the Pingdingshan Mining Area," Energies, MDPI, vol. 13(17), pages 1-19, August.
    2. Feng Cui & Shuai Dong & Xingping Lai & Jianqiang Chen & Chong Jia & Tinghui Zhang, 2020. "Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face," Energies, MDPI, vol. 13(20), pages 1-22, October.
    3. Kai Wang & Lianguo Wang & Bo Ren, 2021. "Failure Mechanism Analysis and Support Technology for Roadway Tunnel in Fault Fracture Zone: A Case Study," Energies, MDPI, vol. 14(13), pages 1-19, June.
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    Cited by:

    1. Krzysztof Skrzypkowski & Krzysztof Zagórski & Anna Zagórska & Derek B. Apel & Jun Wang & Huawei Xu & Lijie Guo, 2022. "Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault," Energies, MDPI, vol. 15(10), pages 1-21, May.
    2. 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.
    3. Huayong Lv & Defeng Wang & Zhanbo Cheng & Yaning Zhang & Tao Zhou, 2022. "Study on Mechanical Characteristics and Failure Modes of Coal–Mudstone Combined Body with Prefabricated Crack," Mathematics, MDPI, vol. 10(2), pages 1-18, January.
    4. Yulong Chen & Junwen Zhang & Jianhang Chen & Xuejie Deng, 2022. "Special Issue: Rock Burst Disasters in Coal Mines," Energies, MDPI, vol. 15(13), pages 1-6, July.
    5. Yuqi Shang & Dezhong Kong & Shijiang Pu & Yu Xiong & Qiang Li & Zhanbo Cheng, 2022. "Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam," Mathematics, MDPI, vol. 10(13), pages 1-18, June.

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