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Analysis on Rockburst Failure Energy Evolution of Model Specimen Under Stress Gradient

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Abstract

Rockburst is a safety problem that needs to be solved urgently in deep rock and mineral exploitation. The stress gradient is an important factor affecting rockburst. To explore the influence mechanism of stress gradient on rockburst, the loading and unloading tests of rockburst physical model under different stress gradients are carried out using the self-developed gas–liquid composite rockburst test device. Based on the strain test results of rockburst model, the spatial distribution characteristics of elastic energy are analyzed. The particle size distribution characteristics and throwing kinetic energy of debris after the rockburst of model are studied. The following conclusions are obtained: (1) the value of the stress gradient coefficient m reflected by the strain within the range of the model loading rockburst gradient 1 affects the temporal and spatial distribution of energy release process; (2) With the increase of the vertical loading stress gradient, the rockburst debris gradually changes from large plate debris to small flake, block and powder debris. The maximum ejection distance of rockburst debris gradually increases, and the dynamic failure phenomenon of rockburst becomes more and more obvious; (3) As the loading stress gradient increases, the throwing kinetic energy of rockburst debris per unit mass shows an increasing trend. The research results are of great significance to tunnel safety construction and rockburst early warning.

Highlights

  • The stress gradient is an important factor affecting rockburst in deep rock mass engineering.

  • The value of the stress gradient coefficient affects the temporal and spatial distribution of energy release process.

  • As the loading stress gradient increases, the rockburst debris gradually changes from large plate debris to small flake, block and powder debris.

  • With the increase of the stress gradient, the maximum ejection distance of debris gradually increases, and the dynamic failure tends to be severe.

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Data availability

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgements

The authors sincerely thank the financial support from the National Natural Science Foundation of China (No.42002275), the National Natural Science Foundation of Zhejiang province (No.LQ21D020001), the Shaoxing Science and Technology Plan Project (No. 2022A13003), the Hubei Key Laboratory of Roadway Bridge and Structure Engineering (Wuhan University of Technology) (No.DQJJ202104).

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Authors and Affiliations

  1. Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430000, China

    Gang Wang

  2. Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, 430000, China

    Gang Wang

  3. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing University, Shaoxing, 312000, China

    Xiqi Liu, Leibo Song & Changbing Zhou

  4. Pearl River Water Resources Research Institute, Guangzhou, 510611, China

    Xiqi Liu & Yan Chang

  5. School of Civil and Architecture Engineering, East China University of Technology, Nanchang, 330013, China

    Zhenhua Wang

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  1. Gang Wang
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  2. Xiqi Liu
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  3. Yan Chang
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  4. Leibo Song
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  5. Changbing Zhou
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  6. Zhenhua Wang
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Contributions

GW: formal analysis, data curation, conceptualization, funding acquisition. XL: writing—review and editing, data curation, investigation, visualization. YC: conceptualization, methodology, formal analysis. LS: formal analysis, data curation, funding acquisition. CZ: formal analysis, data curation. ZW: formal analysis, data curation.

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Correspondence to Xiqi Liu.

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Wang, G., Liu, X., Chang, Y. et al. Analysis on Rockburst Failure Energy Evolution of Model Specimen Under Stress Gradient. Rock Mech Rock Eng 56, 7255–7268 (2023). https://doi.org/10.1007/s00603-023-03462-5

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  • DOI: https://doi.org/10.1007/s00603-023-03462-5

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