Fracture behavior of granite specimen containing a single fissure under uniaxial compression by grain-based model 3D

The understanding of the mechanical behavior of granite containing fissures is of great significance for geothermal energy exploitation and high-level nuclear waste disposal repository. To consider the grain interlocking and rotational resistance behavior in granite specimens, the grain-based model 3D (GBM3D) was constructed to investigate the fracture behavior of granite specimens containing a single fissure. The numerical result indicates that this GBM3D can be used to investigate the mechanical behavior of granite constituted by different minerals, and it can provide more information to understand the mechanical behavior of specimens under loading process. The inter-granular cracks initiate in the first place, but the initiation of intra-granular cracks mainly concentrates after the peak strength. The tensile cracks between different minerals are more than that between the same minerals, and the intra-granular cracks in muscovite initiate firstly, and the number of them is more than that in other minerals. The wing crack is mainly constituted by the inter-granular cracks, and the shape of it is different in different depths, whereas the anti-wing is similar in different depths.