Numerical simulation of the damage process of rock containing cracks by impacts of steel-particle water jet

Abstract

Numerical models are established based on the coupled SPH-FEM algorithm to explore the damage mechanism of rock containing cracks by impacts of steel-particle water jet. The results indicate that the collapse zone appears above the crack because of the blocking of the stress wave propagation by the crack, and the damage inside the collapse zone is accumulated in a stepwise way. Moreover, the volume of the broken hole increases nonlinearly with the crack length while the depth is basically unchanged. The crack inclination affects the impact direction of the steel-particle water jet, which changes the shape of the broken hole. There exists interference between cracks when the dimensionless crack spacing is less than 2.0. For the upper surface center of the lower crack, there is a one-step surge in damage value before completely broken, and the corresponding damage value at the turning point increases with the crack spacing.