Abstract
To better reveal the rock damage evolution law during rock breaking by Polycrystalline Diamond Compact (PDC) cutter, the Finite-Discrete-Infinite Element Method (FDIEM) was adopted to establish the 3D models for rock breaking by PDC cutter pressing and cutting. It was found that the cutter tip was the starting point of crack initiation during rock breaking by PDC cutter pressing. When the pressing depth was about 2 mm, the tensile breaking ratio of the rock was the highest, which was the most conducive to rock breaking. During rock breaking by PDC cutter cutting, the boundary of the area where the cutter contacts with rock was the starting point of micro-crack initiation. The volumetric fracture mainly occurred in the rock surface area in front of the cutter, and the comminuted fracture mainly occurred in the rock in contact with the front of the cutter. A new method based on crack density has been proposed to evaluate rock damage during rock breaking by PDC cutter. The results proved the feasibility and reliability of the FDIEM in simulation of rock breaking by PDC cutter, which can provide a method guidance for the studies on other types of rock breaking tools.
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