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Geomechanics and Engineering Volume 41, Number 2, April25 2025 (Special Issue) pages 243-254 DOI: https://doi.org/10.12989/gae.2025.41.2.243 |
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 open accessEffect of standoff distance and abrasive particle size on abrasive waterjet drilling of hard rock: A numerical study |
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Hyun-Joong Hwang, Yohan Cha, Joohyun Park and Gye-Chun Cho
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| Abstract | ||
| Abrasive waterjet technology offers high efficiency in drilling high-strength materials such as rock and concrete, and is utilized in various fields such as precision machining, geotechnical engineering and mining engineering. Previous studies have analyzed the jet flow characteristics in air through experimental, analytical, and numerical approaches; however, they were primarily limited to short standoff distances and single-sized abrasive particles, limiting their application to large-scale geotechnical and mining engineering sites. To overcome these limitations, this study performed a numerical analysis considering various standoff distances and abrasive particle sizes. This study observed jet flow characteristics in the axial and radial directions and evaluated the abrasive velocity and kinetic energy. In addition, the critical energy for rock drilling was derived to be approximately 0.36 J from the simulation results based on the minimum critical pressure for hard rock excavation. Based on this value, an effective jet diameter that considers the number of abrasive particles was proposed for various standoff distances and abrasive particle sizes. The abrasive particle size significantly affected the effective jet diameter when the standoff distance was greater than 100 mm. This study aims to expand the applicability of abrasive waterjet technology in geotechnical and mining fields and provide essential guidelines for optimizing an efficient system design and abrasive selection strategy under various field conditions. | ||
| Key Words | ||
| abrasive waterjet; effective jet diameter; jet flow characteristics; numerical method; rock drilling | ||
| Address | ||
| Hyun-Joong Hwang: Applied Science Research Institute, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea Yohan Cha: Disposal Performance Demonstration R&D Division, Korea Atomic Energy Research Institute (KAERI), 111 Daedeok-daero, 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea Joohyun Park and Gye-Chun Cho: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea | ||