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1 Journal of Theoretical and Applied Mechanics

1 2025

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Numerical study on micro-fracture characteristics of rock unloading failure under high stresses and the explanation for rock burst

Yang Yuezong, Li Anye

Journal of Theoretical and Applied Mechanics

2025

Vol. 63 nr 2

263--278

The micro-structure of rock essentially affects its macroscopic mechanical behaviors. To investigate the effect of micro-structure on the rock burst, an improved grain-based discretized virtual internal bond (GB-DVIB) model is developed. By the improved GB-DVIB model, different types of mineral grains and grain-boundaries can be generated effectively. A novel parameter calibration method, in which the scanning electron microscope, nano-indentation approach and conventional mechanical tests are utilized synthetically, is proposed. The single face unloading test is simulated to verify the ability of the improved GD-DVIB model to simulate the rock burst. The simulated results show that the the improved GB-DVIB model can simulate the intra- and inter-granular cracking and the main characteristics of the rock unloading failure process. The influence of the specimen size and the micro-structure on the rock burst proneness is investigated. As the height-to-thickness ratio decreases from large to small, the tensile failure characteristics weaken, while the shear failure characteristics enhance, manifested as the tensile-shear transition. With the increase of mineral grain size and heterogeneity, the rock burst proneness is stronger. Compared with the horizontal distribution of mineral grains, the vertical distribution can make the rock burst proneness stronger.