Abstract
In this study, the numerical simulation of rock specimens containing 3-D internal cracks was carried out using a finite element method based on M-integral and adaptive mesh techniques. The effects of two different crack distribution forms and five crack surface inclination angles α on the crack propagation behaviour under uniaxial tensile conditions were investigated, and the main conclusions were obtained as follows: the superposition of the stress field at the crack tip results in an asymmetric distribution of SIF along the short axis of the crack. When two vertically aligned parallel cracks show a wrapped shape, the coalescence between the cracks is an important reason for the failure of the specimen. However, there is no wrapped shape between the two collinear parallel cracks, and the individual propagation of the crack leads to the failure of the specimen. The α is an important factor that determines the difficulty of crack cracking. As α decreases, the energy release rate increases, and the specimen is more prone to failure. The numerical results in this paper are in good agreement with the physical experiments, and the research results can provide a reference for the multiple internal cracks failure process of brittle materials such as rocks.
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Zhang, Z. Numerical Simulation of Crack Propagation of Rock Specimens Containing Multiple Internal Cracks Under Uniaxial Tension. Geotech Geol Eng 40, 3607–3618 (2022). https://doi.org/10.1007/s10706-022-02121-w
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DOI: https://doi.org/10.1007/s10706-022-02121-w