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Dynamic failure and stability model analysis of thick and hard rock with wedge-structure immediate roof occurrence

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Geomechanics and Geophysics for Geo-Energy and Geo-Resources Aims and scope Submit manuscript

Abstract

To eliminate roof-control disasters typically encountering in mines with thick and hard rock strata, fracture characteristics, instability mechanism and prevention methods were investigated in the study. A mine stope with thick and hard main roof and wedge-structure immediate roof in Zhuxianzhuang Coal Mine was taken as the background. In terms of the strata behaviors and roof control difficulty levels via physical simulations, mining zones were classified into strong pressure behavior zone, less-strong pressure behavior zone and pressure mitigation zone. Theoretical analysis was used to study the interaction characteristics of the support-surrounding rock under different mining zones and the principles and methods of zonal control under THR were proposed. A coordinated control method, which combined confined blasting in water-filled deep holes for reducing the roof fracture size and reasonable support optimization for increasing the supporting intensity, was applied to the strong pressure behavior zone and less-strong pressure behavior zone. The mechanical calculation model of a “presplit-THR-block–immediate-roof-top-block–top-coal-wall–hydraulic-support” system was established, which determined the length of confined blasting blocks as 20–25 m and supporting intensity as 1.15–1.28 MPa. These parameters can satisfy the requirements of THR control and lead to the best economic performance.

Article Highlights

  • Study the fracture characteristics and instability migration law of THR, could be found in 3.1 Structural characteristics of the THR in close distance during the first weighting part.

  • Divide the mining zones based on the strata behaviors and roof control difficulty, could be found in 3.1 Control zones of THR part.

  • The principles and methods of zonal control under THR were proposed, could be found in 3.2 Zonal control principles and methods for THR, 3.3 Mechanical model of pre-control of THR in close distance and determination of working resistance, and the 3.4 Pre-control technology for THR in close distance part.

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Data Availability

The data used for supporting the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This paper was supported by the Shanxi Province Science Foundation for Youths Grant (SPSFYG) [No. 201901D211038], Shanxi Province General Natural Fund Project [No. 201901D111049] and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province (STIP) [No. 2019L0347]. The authors are grateful for this support.

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Authors and Affiliations

  1. Key Laboratory of In Situ Modified Mining Ministry of Education, Taiyuan University of Technology, Shanxi Province, Taiyuan, 030024, China

    Tong Zhao

  2. College of Mining Technology, Taiyuan University of Technology, Shanxi Province, Taiyuan, 030024, China

    Peilin Gong

  3. Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpasa Campus, Esenler, Istanbul, 34220, Turkey

    Kaan Yetilmezsoy

  4. School of Chemical and Bioprocess Engineering, University College Dublin, Priesthouse, Dublin, Ireland

    Majid Bahramian

  5. State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou, 221116, China

    Changyou Liu

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  1. Tong Zhao
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  2. Peilin Gong
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  3. Kaan Yetilmezsoy
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  4. Majid Bahramian
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Correspondence to Peilin Gong.

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Zhao, T., Gong, P., Yetilmezsoy, K. et al. Dynamic failure and stability model analysis of thick and hard rock with wedge-structure immediate roof occurrence. Geomech. Geophys. Geo-energ. Geo-resour. 7, 80 (2021). https://doi.org/10.1007/s40948-021-00277-y

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  • DOI: https://doi.org/10.1007/s40948-021-00277-y

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