Numerical Simulation Of Rock Fragmentation Process Induced By A Drill Bit Under The Impact Loading

In recent years, with the improvement of the needs of the social development and the scientific and technology level, the development and utilization of underground space and a variety of resources has become one of the focus areas around us. Rock crushing theory and technology is facing new challenges while various types of excavators are widely used in mining, tunneling, oil and gas well drilling engineering. The impact of rock breaking as a mainstream rock breaking methods, has its own advantage of big rock crushing and high efficiency. And it promote each other in a large number of theoretical research and engineering practice, the impact of rock breaking technology has been widely used in various industries.The paper uses RFPA2D-dynamic software, based on the microscopic damage mechanics and the dynamic finite element method, from high-solving dynamic finite element equation to proceed, simulate fragmentation of the rock under the impact loading in different reality conditions. The research content is as follows:(1) Explored several different large sparse symmetric matrix equation solving method in solving the time-consuming as well as differences in system memory consumption. And the speed amplitude of the solving after joining the OpenMP technology in the personal computer platform.(2) The existence of joints change the destruction of the rock mass under the impact loading. A numerical of simulate of the jointed rock with different spacing and inclination angle of the joints under the dynamic loading to show the form of destruction of in these case.(3) In the view of loading formal, a lot of rock-breaking equipment the rock breaking with impact load and static load characteristics. A numerical code RFPA is used to simulate fragmentation process under three different loading conditions which are single dynamic, combined dynamic and static loading, and the combined dynamic loading under the confining pressure to reveal the combined dynamic and static loading, static pressure and dynamic load on the rock crushing form.