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A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas

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  • Guangzhe Xue

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Chao Gu

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China
    School of Coal Engineering, Shanxi Datong University, Datong 037003, China)

  • Xinqiu Fang

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

  • Tao Wei

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Large deformation and failure of soft rock are pressing problems in the mining practice. This paper provides a case study on failure mechanisms and support approaches for a water-rich soft rock roadway in tectonic stress areas of the Wangzhuang coal mine, China. Mechanic properties of rock mass related to the roadway are calibrated via a geological strength index method (GSI), based on which a corresponding numerical simulation model is established in the Universal Discrete Element Code (UDEC) software. The failure mechanism of the roadway under water-saturating and weathering conditions is revealed by field tests and numerical simulation. It is found that the stress evolution and crack development are affected by weathering and horizontal tectonic stresses. The roadway roof and floor suffer from high stress concentration and continuous cracking, and are consequently seen with rock failure, strength weakening, and pressure relief. Unfortunately, the current support system fails to restrain rock weathering and strength weakening, and the roadway is found with serious floor heave, roof subsidence, and large asymmetric deformation. Accordingly, a new combined support system of “bolt–cable–mesh–shotcrete + grouting” is proposed. Moreover, numerical simulation and field testing are conducted to validate the feasibility and effectiveness of the proposed approach, the results of which demonstrate the capacity of the proposed new support method to perfectly control the surrounding rock. Findings of this research can provide valuable references for support engineering in the soft rock roadway under analogous geological conditions.

Suggested Citation

  • Guangzhe Xue & Chao Gu & Xinqiu Fang & Tao Wei, 2019. "A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas," Sustainability, MDPI, vol. 11(13), pages 1-24, June.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:13:p:3510-:d:243221
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    References listed on IDEAS

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    1. Renshu Yang & Qinghai Li & Qing Li & Xianlei Zhu, 2017. "Assessment of Bearing Capacity and Stiffness in New Steel Sets Used for Roadway Support in Coal Mines," Energies, MDPI, vol. 10(10), pages 1-16, October.
    2. Xiaojie Yang & Eryu Wang & Yajun Wang & Yubing Gao & Pu Wang, 2018. "A Study of the Large Deformation Mechanism and Control Techniques for Deep Soft Rock Roadways," Sustainability, MDPI, vol. 10(4), pages 1-20, April.
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    Cited by:

    1. Shengquan He & Le Gao & Bin Zhao & Xueqiu He & Zhenlei Li & Dazhao Song & Tuo Chen & Yanran Ma & Feng Shen, 2023. "Research on Deformation and Failure Law of the Gob-Side Roadway in Close Extra-Thick Coal Seams," Sustainability, MDPI, vol. 15(3), pages 1-20, February.
    2. Wadslin Frenelus & Hui Peng & Jingyu Zhang, 2022. "An Insight from Rock Bolts and Potential Factors Influencing Their Durability and the Long-Term Stability of Deep Rock Tunnels," Sustainability, MDPI, vol. 14(17), pages 1-35, September.
    3. Haijun Yu & Honglin Liu & Yang Xia & Mingcun Zhang & Yinjian Hang & Wenjie Luo, 2023. "A Study on the Deformation Mechanism of the Rock Surrounding a Weakly Cemented Cross-Layer Roadway, under Tectonic Stress," Energies, MDPI, vol. 16(6), pages 1-17, March.

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