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Dynamic Response Characteristics of Roadway Surrounding Rock and the Support System and Rock Burst Prevention Technology for Coal Mines

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  • Dong Xu

    (School of Mines, Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Xuzhou 221116, China
    The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Mingshi Gao

    (School of Mines, Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Xuzhou 221116, China
    The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Xin Yu

    (School of Mines, Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Xuzhou 221116, China
    The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Anchor cables (bolts) act as the main support system and play an important role in improving the rock burst resistance and stability of the roadway surrounding the rock. In this study, the dynamic response characteristics of the roadway surrounding the rock and the support system under different shock intensities were investigated. The following findings were obtained. The stress wave propagation process under dynamic shock was divided into a stress vibration initiation stage, a stress fluctuation stage, and a stress adjustment stage. In the stress vibration initiation stage, the surface mass of the roadway surrounding the rock started to vibrate, and the pretension of the anchor cables (bolts) was reduced; in the stress fluctuation stage, the failure of the roadway surrounding the rock intensified, and the anchor cables (bolts) were damaged to some extent; and in the stress adjustment stage, the roadway deformation of the surrounding rock and the axial forces of the anchor cables (bolts) tended to stabilize. As the dynamic shock intensity increased, the vibration velocity, displacement increment, and acceleration amplitude of the mass of the roadway surrounding the rock increased exponentially. The critical shock energy of the roadway surrounding the rock was 10 5 J, above which the damage to the rock was aggravated. The larger the pretension of the anchor cables (bolts) was and the higher the dynamic shock intensity was, the more severe the damage to the anchor cables (bolts) was. Given the dynamic response characteristics of the roadway surrounding the rock and support elements under shock, a full anchor cable yielding support technology is proposed to effectively control the stability of the roadway surrounding the rock under dynamic shock, providing a reference for the construction of the support systems for preventing rock bursts in similar roadways.

Suggested Citation

  • Dong Xu & Mingshi Gao & Xin Yu, 2022. "Dynamic Response Characteristics of Roadway Surrounding Rock and the Support System and Rock Burst Prevention Technology for Coal Mines," Energies, MDPI, vol. 15(22), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8662-:d:976918
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    References listed on IDEAS

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    1. Xinxin Zhou & Zhenhua Ouyang & Ranran Zhou & Zhenxing Ji & Haiyang Yi & Zhongyi Tang & Bo Chang & Chengcheng Yang & Bingcheng Sun, 2021. "An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine," Energies, MDPI, vol. 14(21), pages 1-15, November.
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    Cited by:

    1. Yuxi Hao & Mingliang Li & Wen Wang & Zhizeng Zhang & Zhun Li, 2023. "Study on the Stress Distribution and Stability Control of Surrounding Rock of Reserved Roadway with Hard Roof," Sustainability, MDPI, vol. 15(19), pages 1-21, September.

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