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学者姓名：陈聪聪
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Abstract ：
Spalling failure commonly exists during the progressive excavation of underground engineering, and the stepped excavation of underground mining stope is rarely simulated in previous studies. Therefore, the biaxial compression test is finished by sandstone samples containing rectangular hole (with different cavity heights), and the corresponding numerical simulation is conducted by the discrete element method. Based on the mechanical, optical and acoustic data captured during the test, the main results and conclusions are as follows: 1) There are two paths to activate the typical spalling failure, the first way is caused by the rapid energy release (manifested as sudden AE burst), and the second way is that the released energy accumulates to a threshold over a long period and finally causes large-scale damage. 2) The relatively larger cavity height delayed the initiation of central tensile failure in the roof & bottom surrounding rocks and the spalling failure in sidewalls. 3) The relatively larger confining pressure contributes to the early construction of the spalling failure and limits the extension of the central tensile crack bands. 4) The construction of spalling failure is very fast, the ejected rock plates are caused by several rounds of spalling failure, and the final V-shaped groove is built by the spalling failure and internal crushing failure. © 2024 Elsevier Ltd
Keyword ：
Biaxial loading Biaxial loading Mining stope excavation Mining stope excavation PFC2D PFC2D Spalling failure Spalling failure
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| GB/T 7714 | Zhao, Y. , Qi, Q. , Chen, C. et al. Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study [J]. | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
| MLA | Zhao, Y. et al. "Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study" . | Theoretical and Applied Fracture Mechanics 133 (2024) . |
| APA | Zhao, Y. , Qi, Q. , Chen, C. , Chen, L. . Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study . | Theoretical and Applied Fracture Mechanics , 2024 , 133 . |
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Abstract ：
Spalling failure commonly exists during the progressive excavation of underground engineering, and the stepped excavation of underground mining stope is rarely simulated in previous studies. Therefore, the biaxial compression test is finished by sandstone samples containing rectangular hole (with different cavity heights), and the corresponding numerical simulation is conducted by the discrete element method. Based on the mechanical, optical and acoustic data captured during the test, the main results and conclusions are as follows: 1) There are two paths to activate the typical spalling failure, the first way is caused by the rapid energy release (manifested as sudden AE burst), and the second way is that the released energy accumulates to a threshold over a long period and finally causes large-scale damage. 2) The relatively larger cavity height delayed the initiation of central tensile failure in the roof & bottom surrounding rocks and the spalling failure in sidewalls. 3) The relatively larger confining pressure contributes to the early construction of the spalling failure and limits the extension of the central tensile crack bands. 4) The construction of spalling failure is very fast, the ejected rock plates are caused by several rounds of spalling failure, and the final V-shaped groove is built by the spalling failure and internal crushing failure.
Keyword ：
Biaxial loading Biaxial loading Mining stope excavation Mining stope excavation PFC2D PFC2D Spalling failure Spalling failure
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhao, Yusong , Qi, Qi , Chen, Congcong et al. Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
| MLA | Zhao, Yusong et al. "Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 133 (2024) . |
| APA | Zhao, Yusong , Qi, Qi , Chen, Congcong , Chen, Long . Spalling characteristics of sandstone containing rectangle hole with gradient cavity height: An experimental and DEM numerical study . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 . |
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Abstract ：
Traditional rock burst always forms the V-shaped groove in tunnel sidewall, and the interaction characteristics and mechanisms between the original fractural plane and potential V-shaped failure region are not yet clear. We thus carried out the numerical investigation through PFC2D software to explore the interaction features between the above objects. Three sets of post-processing analyses are applied, the moment tensor inversion helps to reveal the quantitative intensity and specific patterns of secondary damage, the events cluster analysis through the Kmeans++ clustering method calibrates the development process of spalling failure at different positions, and the principal stress estimation can predict the extent and maximum depth of the V-shaped groove. Numerical simulations proved that the fractural plane cannot affect the failure process of the intact surrounding rock in left sidewall, and the fractural plane leads to the early appearance of secondary failures in the right sidewall; as the fractural plane moves outward, the size of V-shaped failure region and the dominant mode of secondary failures gradually change; when the fractural plane is outside the potential V-shaped failure zone, the local failure (caused by fractural plane) and spalling failure (started at tunnel free surface) exhibit independent development during majority period of the test.
Keyword ：
Event clustering analysis Event clustering analysis Fractural plane Fractural plane Moment tensor inversion Moment tensor inversion PFC2D PFC2D Rock burst Rock burst
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| GB/T 7714 | Zhao, Yusong , Lin, Chencheng , Ni, Anna et al. Interaction characteristics between rock burst risk region and neighboring fractural plane: a numerical investigation based on moment tensor inversion and Kmeans plus plus clustering [J]. | COMPUTATIONAL PARTICLE MECHANICS , 2024 , 12 (2) : 841-866 . |
| MLA | Zhao, Yusong et al. "Interaction characteristics between rock burst risk region and neighboring fractural plane: a numerical investigation based on moment tensor inversion and Kmeans plus plus clustering" . | COMPUTATIONAL PARTICLE MECHANICS 12 . 2 (2024) : 841-866 . |
| APA | Zhao, Yusong , Lin, Chencheng , Ni, Anna , Li, Binglei , Chen, Congcong . Interaction characteristics between rock burst risk region and neighboring fractural plane: a numerical investigation based on moment tensor inversion and Kmeans plus plus clustering . | COMPUTATIONAL PARTICLE MECHANICS , 2024 , 12 (2) , 841-866 . |
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