Abstract
Rock masses are characterized by many discontinuities, the distribution and interactions of which are closely related to the mechanical properties and control the stability of the rock mass. In this work, uniaxial compression tests were conducted on granite with prefabricated cracks in the form of topological branches to study the related fracture network. A high-speed camera and an industrial camera were used to capture images of the crack initiation, propagation, coalescence, and complete failure process. Digital image correlation processing was then employed to obtain the global strain field evolution diagram of the specimens. The following results were obtained. (1) The initial strain localization zone of specimens with different forms of prefabricated fractures mainly shows two initiation modes, namely, T- and H-shaped fractures. (2) Macroscopic cracks propagate along the direction of the maximum principal stress.
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