To study the dynamic process, damage evolvements, and failure mechanisms of rock under the impact of angled water jet, the Lagrangian-Euler algorithm is used. Based on the fluid-solid coupling, a model of angled water jet impacting rock that could reflect the influence of the water on the rock and the water jet with high pressure under the submerged condition is constructed. Based on the rock breaking volume, the influence of incident angle, standoff and jet velocity on rock breaking effect is analyzed, and the simulation results are verified by laboratory experiments. Results showed that the main form of breaking rock is the unloading stretch damage caused by the jet impact and the tensile shear failure caused by the jet erosion. The rock breaking volume increases with the angle of incline and the standoff. As the jet velocity increases, the volume of breaking rock is increased. When the water jet impacts the rock at a certain angle, it is easy to make a large area of damage under the combined action of forward impact and radial stretching. Therefore, the water jet with an angle is efficient method to improve the drilling performance and reduce the drilling costs.
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