![]() ![]() If 0° 60°, no interface crack can be found even with a very small interface strength, and the secondary cracks remain, regardless of the interface strength. The formation of the typical cracks is also controlled by the interface strength. The results indicate that the interface cracks can be observed for disc samples under smaller loading angles while the secondary cracks can be observed for disc samples under larger loading angles. Different typical crack patterns were identified: interface cracks, wing cracks and secondary cracks. In this study, a numerical model, based on the inserted cohesive zone model (CZM) method, was developed to simulate the complex crack behaviours in layered discs with a pre-existing interface crack, which were further validated by Brazilian tests. Crack initiation and propagation from a pre-existing interface crack are of great importance in assessing the integrity and stability of layered rocks, rock/concrete systems and other layered structures. ![]()
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