Stress Modeling and Simulation Analysis of Particle Impact Rock-Breaking

As a new type of drilling method, with adding a certain proportion of steel particles into high-pressure pipe, high-velocity particle is formed to impact on rock surface to produce very large rock-breaking stress and achieve to drill rapidly. Therefore, based on cavity expansion theory, firstly, mathematical model of stress of particle impact rock was established, and the stress distribution of rock-breaking was numerical calculated. Then, the dynamical rock-breaking process under particle impact was simulated, and simulation results were compared with numerical calculation results. The results showed that there was a good agreement with each other, and rock-breaking stress could increase with increase of particle impact velocity. It would be of great significance to the development and improvement of particle impact drilling theory.