Comptes Rendus
no. 6
The effects of the rock bridge ligament angle and the confinement on crack coalescence in rock bridges: An experimental study and discrete element method
Wen Wan1  ; Jie Liu1 ; Yanlin Zhao1 ; Xiang Fan2
1 School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, China
2 School of Highway, Chang'an University, Xi An, China
Comptes Rendus. Mécanique, Volume 347 (2019) no. 6, pp. 490-503.

The present article investigates the influences of the rock bridge ligament angle, β, and the confinement on crack coalescence patterns by conducting laboratory and numerical tests on rock-like specimens. Laboratory tests show that no coalescence in the rock bridge occurred for low β. With an increase of β, tensile-shear coalescence and tensile coalescences subsequently occurred. In addition, the increase in the confinement first promoted shear coalescence and then restrained crack coalescence for low β, whereas the tensile coalescence was restrained by the increase in confinement for high β. The numerical results corroborate the laboratory tests in the coalescence patterns. In addition, the numerical study shows that tensile and shear cracks subsequently initiated near crack tips because of the concentrated tensile and shear stresses, respectively. Regarding the influence of β on crack coalescence, tensile or shear stress failed to concentrate in rock bridges for low β. Therefore, the cracks failed to coalesce, whereas with the increase in β, tensile and shear stress concentrations occurred in the bridge and led to either tensile shear or tensile coalescence. Regarding the influence of confinement on crack coalescence, the increase in confinement restrained the tensile stress concentrations and further hindered tensile crack coalescence in rock bridges for high values of β.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2018.12.006
Mots clés : Crack coalescence, Stress concentrations, Tensile crack, Shear crack
Wen Wan 1 ; Jie Liu 1 ; Yanlin Zhao 1 ; Xiang Fan 2

1 School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, China
2 School of Highway, Chang'an University, Xi An, China 
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Wen Wan; Jie Liu; Yanlin Zhao; Xiang Fan. The effects of the rock bridge ligament angle and the confinement on crack coalescence in rock bridges: An experimental study and discrete element method. Comptes Rendus. Mécanique, Volume 347 (2019) no. 6, pp. 490-503. doi : 10.1016/j.crme.2018.12.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2018.12.006/

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