In this paper, using the PFC2D software based on the discrete component method, the effect of the hole geometric parameters (spacing) on ​​the rock crushing mechanism has been investigated. For this purpose, a model with dimensions of 1000x1000 mm was built in the software environment. Then, the calibrated microparameters were applied to the model. The microparameters were calibrated after simulating the tensile strength of the rock and comparing it with the laboratory sample. In order to investigate the effect of the geometric parameters on the fracture mechanism, holes with different spacing to removal ratios were drilled in the numerical model (spacing to removal ratio equal to 1.15, 1.3 and 1.45). By examining different fracture zones in different states in the PFC2D and Wipfrog software, a spacing to removal ratio equal to 1.3 was proposed as the most desirable arrangement for grinding. In other words, the most optimal grain dimensions are obtained in this ratio. The effect of different damping on the failure mechanism was also investigated. As the damping increases, the crushing rate decreases, with the highest crushing rate corresponding to a damping of 0.5.