Mechanical Characters And Experimental Research On Rock Fragmentation Under Dynamic-Static Combined Loads

Rock cutting process is complex dynamic process and shows stronger nonlinear characteristics. Since the 1960s Many scholars have been engaged in research on rock framentation deeply and obtained great results. However, the questions on hard rock fragmentation under dynamic-static combined loads with many fracturing patterns are still not solved. Thereby the theoretical analysis and experimental research on rock fragmentation under coupling static and dynamic loads are primarily set forward.The testing parameters and schedules under coupling static and dynamic loads are determined, the fragmentation courses of rock experiencing vertical static pressure and horizontal cutting force, or vertical impacting and cutting force are analyzed, and the cutting models are established. The rock fragmentation under uni-static, uni-dynamic loads and coupling static and dynamic loads were experimented in the multifunctional device. Secondly signals of rock cutting were grinding and handled.In order to study the cutting rock-breaking effect of the changes on static and dynamic load parameter. The theory of chaos on the rock cutting process has been calculated and analyzed in this paper. the following analysis technique such as power spectrum analysis, phase space reconstruction, correlation dimension, the largest Lyapunov exponent are used to research the grinding conditions in which chaos apper were discussed. The results show that, Cutting is a rock-breaking irregular non-cyclical phenomenon Chaos. The fractal dimension is a sensitive measure of the mechanism of rock breaking. Recognition can be effective in cutting force under static and dynamic load combination of the extent of the role.Theoretical analysis and experimental results showed that, the depth of vertical . cutting or cutting force with the increase in both WOB increases. Impact cutting and cutting compared, not only can increase depth of cut, but can also reduce the large number of cutting force. Fragmentation effects of rock under coupling dynamic and static loads have more obvious advantages than that of uni-impacting or uni-static pressure. This preliminary research result of this paper has theoretical significance of enriching rock fragmentation theory and engineering application values for developing a new drilling and mining machine.