Numerical simulation of water jet excavation of rock using smoothed particle hydrodynamics

We used the Smoothed Particle Hydrodynamics (SPH) method, which is a type of particle method, to numerically simulate the water jet (WJ) excavation of rock. The results can be summarized as follows: (1)We developedcode for the three-dimensional numerical simulation of the WJ excavation of rock. (2) To verify the usefulness of this simulation code, we performed alaboratory experiment that involved rock excavation by WJ. (3) We proposed five types of failure criteria in the simulation of WJ excavation by SPH. The tensile strain criterion, which is based on the tensile strain between a particle and a neighboring particle,was consistent with the experimental results. This criterion was considered to most closely approximate the mechanism ofWJ excavation. (4) To remove fractured rock particles from the wall of the borehole, we used repulsive force between the fractured particles and unfractured particles of rock in the case of the tensile strain criterion. Our results verified that the fractured particles were drained from the borehole.