Hard rock fragmentation mechanism and performance characterization of a pressurized pulsed water jet

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (10) : 21-29.

SHOCK AND EXPLOSION

Hard rock fragmentation mechanism and performance characterization of a pressurized pulsed water jet

LING Yuanfei1,2，WANG Xiaoqiang1,2，TANG Jiren*3，ZHANG Yangkai4

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Abstract

As a novel type of pulsed water jet, the pressurized pulsed water jet has the advantages of large amplitude pressurization, controllable jet parameters, and high energy utilization rate, which shows broad application prospects in the field of hard rock fragmentation. To improve the rock fragmentation performance of the jet, a pressurized pulsed water jet generation system developed by ourselves was used to conduct the granite fragmentation experiments. Based on three-dimensional morphological scanning technology, a precise macroscopic performance expression method of rock fragmentation was proposed to explore the effects laws of different process parameters on rock fragmentation performance, and the mechanism of fine-grained fracture and damage distribution was revealed. The results show that there is a clear step-like increase in the rock fragmentation performance parameters when the jet pressure is 60 MPa, the rock fragmentation performance parameters drop sharply when the target distance is greater than 100 mm, and the rock fragmentation performance parameters reach the maximum when the nozzle diameter is 0.5 mm. The granite forms a crack network composed of "primary cracks, radial cracks, and derived cracks" under the impact of the jet. The crater is in the shape of a spoon, with a large entrance area and a shallow depth, and the failure mode is sheet-like detachment caused by the expansion of internal fractures. Meanwhile, the jet's damage and destruction to the rock has a local effect, as the depth increases, the overall damage area distribution range remains basically unchanged, and the dense damage region and damage degree decrease rapidly. The research results provide theoretical support for the engineering application of pressurized pulsed water jet for hard rock fragmentation.

Key words

hard rock / pressurized pulsed water jet / performance characterization / fragmentation mechanism

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LING Yuanfei1, 2, WANG Xiaoqiang1, 2, TANG Jiren3, ZHANG Yangkai4. Hard rock fragmentation mechanism and performance characterization of a pressurized pulsed water jet[J]. Journal of Vibration and Shock, 2025, 44(10): 21-29

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