Numerical study of self-rotating abrasive water jet rotary slotting of rock

Abstract

Abrasive water jet rock cutting can alleviate the difficulty of deep fossil energy extraction. The mechanism of active rotational cutting of rocks by an abrasive water jet under the influence of rotational degrees of freedom is still unclear. To reveal the mechanism and influencing factors of abrasive water jet rotary rock cutting, a numerical model is established through smooth particle hydrodynamics (SPH) and the finite element method (FEM). The restart method is used to solve the problem of damage transmission in the repeated cutting of rocks by abrasive water jets. The influences of parameters such as the deflection angle and abrasive concentration on the rock fragmentation effect are analyzed. The failure removal mechanism of rock elements and the weakening effect of repeated abrasive water jet impacts on rocks are studied based on stress and damage data. This study provides a reference for the application of abrasive jets in excavation, top cutting and pressure relief, gas extraction, and hydraulic fracturing of hard rock tunnels in deep coal mines.