Abstract
The micro-scale damage evolution of the rock-like specimens with prefabricated flaw pairs under uniaxial compression were studied by scanning electron microscopy. The morphologies and mechanical properties on the surfaces of failure specimens were compared with the specimens failed under single tension and single shear respectively. By analyzing the numerical simulation results, the characteristics of cracks propagation and stress distribution on the fractured surfaces were studied. The results show that the tensile stress plays a leading role in the propagation of wing cracks and anti-wing cracks during the failure of the double flawed specimens with the inclination angle of 45°. The rock bridges have little effect on the propagation of wing cracks outside the outer tips of flaw pairs, but have influence on the initiation and propagation of anti-wing cracks. In the double flawed specimens with the inclination angle of 60°, the coalescence types are related to the angles of the rock bridges. The failure characteristics near the crack tips are different when the rock bridge angles change. With the cracks overlap and coalesce, the proportion of tensile failure increases gradually.
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