Abstract
A series of laboratory tests were carried out focusing on the fracture characteristics of granite under different stress conditions. The macroscopic mechanical characteristics of granite, such as nonlinear stress–strain curve, tension compression bi-modularity, crack initiation, and propagation laws during Brazil splitting, were analyzed with the help of the digital image correlation method. A fine discrete-element model was established based on the laboratory test results and aimed to overcome the shortcomings of traditional simulation. The proposed model reproduced the characteristics of inherent microcrack closure, tension compression bi-modularity, and crack evolution under different stress paths. The detailed calibration method of the microparameters in the model was summarized. The relationship between macro-mechanical properties and micro-attributes of granite was further analyzed using the fine discrete-element model. The stress thresholds in uniaxial compression and crack initiation phenomenon in Brazil splitting were analyzed and explained from the micro-perspective. The microphysical significance of the Hoek–Brown criterion in shear failure was clarified through analyzing numerical test results. Hoek–Brown criterion is found being a statistical rule summary of the overall strength composed of the random distribution of the strength of the two parts in the rock: the cohesion of bonded particles and the friction of nonbonded particles.
Highlights
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A comprehensive discrete-element model is established that can simultaneously reflect the characteristics of inherent microcrack closure, tension compression bi-modularity and crack evolution under different stress paths.
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The stress thresholds in uniaxial compression and the crack initiation phenomenon in Brazil splitting are analyzed and explained from the micro-perspective.
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The microphysical significance of Hoek–Brown criterion is clarified through numerical tests.
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Data availability
The authors confirm that the main data supporting the findings of this study are available within the article. Some basic programming methods are available on request from the corresponding author, Cheng Zhao, upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China [Grant numbers U22A20597, 42142019]. The authors are deeply grateful for these supports. The anonymous reviewers’ comments have improved the quality of this paper and are also greatly acknowledged.
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Conceptualization: CZ, RZ; methodology: RZ, JN, JX; formal analysis and investigation: RZ, JX, QL; writing—original draft preparation: RZ; writing—review and editing: RZ, CZ, YH; funding acquisition: CZ; resources: CZ; supervision: CZ.
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Zhang, R., Zhao, C., Xing, J. et al. A Study on Mechanical Behavior of Intact Granite Through a Sound Simulation Using Flat-Jointed Contact. Rock Mech Rock Eng 57, 1417–1436 (2024). https://doi.org/10.1007/s00603-023-03612-9
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DOI: https://doi.org/10.1007/s00603-023-03612-9