Hard rock-breaking performance of supercharged pulsed water jet

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (7) : 114-122.

LU Yiyu1,2, ZHU Zhidan1,2, TANG Jiren1,2, LIU Wenchuan1,2, LING Yuanfei1,2,ZHANG Yangkai1,2, YANG Sheng3, YAO Qi1,2

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Abstract

In order to further improve the rock-breaking ability of pulsed water jet, a supercharged pulsed water jet generating method was proposed to obtain a higher pulse pressure at a lower input pressure. To test the hard rock breaking performance of supercharged pulsed water jet, the flow field details were obtained by numerical simulation, and the effects of nozzle diameter, jet pressure and target distance on rock breaking performance were explored based on relevant test bench. The results show that the supercharged pulsed water jet has a better effect on breaking hard rock. Increasing the nozzle diameter, the rock-breaking performance first increases and then decreases. As the jet pressure increases, the jet axis velocity gradually increases, but at the same time, the energy loss caused by the gas-liquid exchange increases, and the rock-breaking effect is the best when the jet pressure is 60MPa under the current experimental conditions. The peak breaking volume occurs when the target distance is 100mm, and the optimum target distance for the maximum breaking depth is 25mm and 75mm, gradually moving back towards the nozzle. The research results have important guiding significance for promoting the application of supercharged pulsed water jet in engineering.

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hard rock / supercharged pulsed water jet / rock breaking performance / single factor experiment;

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LU Yiyu1,2, ZHU Zhidan1,2, TANG Jiren1,2, LIU Wenchuan1,2, LING Yuanfei1,2,ZHANG Yangkai1,2, YANG Sheng3, YAO Qi1,2. Hard rock-breaking performance of supercharged pulsed water jet[J]. Journal of Vibration and Shock, 2023, 42(7): 114-122

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