An experimental study on rock breaking law by rock bullet impacting

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 270-278.

LIU Yong1,2, GUO Xinhui1,2, WEI Jianping1,2, ZHANG Hongtu1,2

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Abstract

In order to solve the problems of rapid wear of drilling tools and low drilling efficiency in the process of deep rock excavation, based on the particle impact rock breaking technology, a method of using high-pressure gas to accelerate the impact of rock bullets on the pre-cracked rock mass of the advancing face was proposed to reduce the wear of drilling tools. The SHPB experiment and the three-dimensional scanning experiment were used to test the absorbed energy of rock failure and the newly added surface area, and a theoretical model for calculating the absorbed energy of rock impact failure was constructed. At the same time, a self-developed rock bullet impact rock breaking experimental device was used to study the influence of gas pressure, bullet mass and lithology on the rock breaking. The results show that the specific surface free energy "γ" _"s" of the experimental granite rock sample was 6.34 mJ/mm2, based on the measured rock fragmentation absorbed energy and added surface area. Increasing the gas pressure can effectively increase the impact kinetic energy of rock bullets, the absorbed energy of granite and the new surface area. At the same time, the crushing and ejection energy of rock bullets will increase, and the efficiency of the impact kinetic energy of rock bullets into granite crushing will be reduced. The absorbed energy is a power product of the mass and kinetic energy of the rock bullets. Keeping the air pressure constant and increasing the mass of the rock bullets can increase the kinetic energy and absorbed energy conversion efficiency of the rock bullets within a certain range, and enhance the damaging effect. Too much increase in rock mass will result in a decrease in kinetic energy, thereby reducing the conversion efficiency of absorbed energy. The specific surface free energy of rocks with different lithology is different. However, the effects of gas pressure and mass of rock bullets on the impact failure effect of rocks with different lithology are basically the same. The research conclusions of this paper will provide theoretical and technical support for hard rock auxiliary excavation.

Key words

auxiliary tunneling / particle jet / impact rock breaking / hard rock crushing / energy dissipation

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LIU Yong1,2, GUO Xinhui1,2, WEI Jianping1,2, ZHANG Hongtu1,2. An experimental study on rock breaking law by rock bullet impacting[J]. Journal of Vibration and Shock, 2023, 42(4): 270-278

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