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A New Prediction Model for Cutting Depth of Hard Rock Using High-Pressure Water Jets

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Abstract

High-pressure pure water jet has been widely used in breaking soft rocks and medium–hard rocks, but its research on cutting hard rocks is very limited. The cutting depth, as the most important index for evaluating the effectiveness of rock breaking by water jet, is difficult to be predicted accurately because of numerous influencing factors. This article aims to establish a concise and universal prediction model for the cutting depth of hard rock, including all variables that affect the cutting depth. Firstly, four types of granite and sandstone, which are difficult to break in engineering, are selected to investigate their cutting depth under the action of high-pressure continuous water jets. The rock physico-mechanical parameter that has the highest correlation with the cutting depth is found to be the shear modulus through tests. In order to reasonably evaluate the energy utilization rate of cutting depth of rock by water jet, the concept of cutting depth energy index (CDEI) is proposed. The jet pressure corresponding to the maximum value of CDEI is approximately 40–60% of the rock compressive strength. The idea of “moderate nozzle diameter, high traverse speed, multiple cuts” is put forward for cutting hard rock more efficiently using high-pressure water jet. Then, a new prediction model of cutting depth for high-pressure water jet cutting hard rock is established using similarity theory and dimensional analysis method, and the accuracy and reliability of the model are verified through experimental testing. The results of the study can help to improve the breakage efficiency of hard rock, and at the same time, provide a theoretical basis for the rational selection of high-pressure water jet parameters.

Highlights

  • The concept of cutting depth energy index (CDEI) of rock subjected to water jet is proposed.

  • The most effective cutting technology method for cutting hard rock by water jet is proposed taking into account the cutting effect and specific energy consumption.

  • A new prediction model of cutting depth for high-pressure water jet cutting hard rock was established using similarity theory and dimensional analysis method

  • The primary variables affecting the cutting depth of hard rock are the jet pressure and the shear modulus of the rock

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Acknowledgements

This research work was financially supported by the National Key Research and Development Program (Grant no. 2022YFC3005902), the Fundamental Research Funds for the Central Universities (Grant no.2021GJZPY15), the Graduate Innovation Program of China University of Mining and Technology (Grant no.2023WLKXJ189), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant no. KYCX23_2748).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Fuwei Liu, Yansen Wang, Xin Huang, Guoxuan Song & Yuning Wang

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Yansen Wang

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  1. Fuwei Liu
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  2. Yansen Wang
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  3. Xin Huang
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  4. Guoxuan Song
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Correspondence to Yansen Wang.

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Liu, F., Wang, Y., Huang, X. et al. A New Prediction Model for Cutting Depth of Hard Rock Using High-Pressure Water Jets. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03919-1

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