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Study on large deformation mechanism and concrete-filled steel tubular support technology for ventilation shaft roadway

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Abstract

The large deformation of deep soft rock roadways and the corresponding support technology are important to the coal mining industry. This study investigated the large deformation mechanism and the concrete-filled steel tubular support technology of a ventilation shaft roadway (VSR) on the basis of a well-documented engineering case. The mechanical parameters of the rock surrounding the VSR were evaluated in accordance with the geological strength index, and the failure modes of the VSR were summarized and analyzed on the basis of geological background and field survey results. The VSR exhibited asymmetrical deformation and the fracture of the 29U-shaped steel support at the side and vault. The deformation, stress, and plastic zone of the VSR without support and with the original support scheme were investigated using the Three-Dimensional Distinct Element Code, and the depth of the plastic zone was verified in accordance with the equivalent radius theory. Dramatic and multiple disturbances, the low strength of the surrounding rock, and the insufficient strength of the support caused the deformation of the VSR. The bottom of the two side walls of the original roadway was prone to inward deformation. Thus, the shape of the original roadway section was optimized by converting it from a straight wall with a semi-circular arch into an inclined wall with a semi-circular arch. A composite concrete-filled steel tubular support scheme is proposed and can be divided into active and passive support. The composite support scheme was verified through numerical simulation and a field application. The monitoring results obtained from the numerical simulation and on-site analysis reveal that the composite support scheme can control the large deformation of the VSR.

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All the data and material generated or analyzed during this study are included in this manuscript.

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Funding

This study was supported by the Beijing Outstanding Young Scientist Program (BJJWZYJH01201911413037), Shannxi Coal Group Key Project (2018SMHKJ-A-J-03), Natural Science Foundation of China (No. 51878658, NO 51508584 and NO.51622404), Key Laboratory of Geotechnical and Underground Engineering (Tong ji University), Ministry Education (KLE-TJGE-B1705), and Yueqi outstanding scholar Award Program by CUMTB.

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Authors and Affiliations

  1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

    Jianping Zuo, Haiyan Liu, Dejun Liu, Tangliang Zhang & Fei Xu

  2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Jianping Zuo

  3. School of Civil Engineering, Shandong Jianzhu University, Jinan, 250100, China

    Jun Wang

Authors
  1. Jianping Zuo
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  2. Haiyan Liu
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  3. Dejun Liu
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  4. Jun Wang
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  5. Tangliang Zhang
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  6. Fei Xu
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Contributions

Jianping Zuo, Haiyan Liu, Dejun Liu, Jun Wang, Tangliang Zhang, and Fei Xu contributed to the study conception and design. Haiyan Liu and Dejun Liu performed the numerical simulation, and Haiyan Liu, Dejun Liu, Jun Wang, Tangliang Zhang, and Fei Xu performed the field test. The first draft of the manuscript was written by Jianping Zuo, and all the authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Dejun Liu.

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Zuo, J., Liu, H., Liu, D. et al. Study on large deformation mechanism and concrete-filled steel tubular support technology for ventilation shaft roadway. Bull Eng Geol Environ 80, 6245–6262 (2021). https://doi.org/10.1007/s10064-021-02331-1

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  • DOI: https://doi.org/10.1007/s10064-021-02331-1

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