Experimental and numerical analysis of high-pressure gas-driven rock particle impact and fragmentation rock technology

Aiming at the problems of fast tool wear and low tunneling efficiency in hard rock tunneling process, a granite particle impact rock breaking technology is proposed to impact the rock mass of the tunneling face in advance to reduce tool wear. By simulating the process of granite particle impact rock breaking, the feasibility of granite particle impact rock breaking is verified. The impact velocity and new surface area of granite were obtained by high-speed camera and three-dimensional scanner test. The influence factors of gas pressure and granite particle quality were analyzed. It is concluded that increasing gas pressure can effectively increase the new surface area of rock failure and improve the failure effect. Improving the quality of granite particles does not continuously increase the impact kinetic energy. When the product of granite particle quality and impact kinetic energy reaches a critical value, continuing to increase the quality will not improve the impact damage effect of granite. The impact kinetic energy of granite particles impacting granite shows a linear relationship with the new surface area.