Geomechanics and Engineering
Volume 29, Number 3, 2022, pages 359-368
DOI: 10.12989/gae.2022.29.3.359
Evaluation of rock cutting efficiency of the actuated undercutting mechanism
Hoyoung Jeong , Yudhidya Wicaksana , Sehun Kim , Seokwon Jeon
Abstract
Undercutting using an actuated disc cutter (ADC) involves more complex cutting mechanism than traditional rock cutting does, requiring the application of various new cutting parameters, such as eccentricity, cutter inclination angle, and axis rotational speed. This study presents cutting-edge laboratory-scale testing equipment that allows performing ADC tests. ADC tests were carried out on a concrete block with a specified strength of 20 MPa, using a variety of cutting settings that included penetration depth (p), eccentricity (e), and linear velocity (v). ADC, unlike pick and disc cutting, has a non-linear cutting path with a dynamic cutting direction, requiring the development of a new method for predicting cutting force and specific energy. The influence of cutting parameters to the cutter forces were discussed. The ratio of eccentricity to the penetration depth (e/p) was proposed to evaluate the optimal cutting condition. Specific energy varies with e/p ratio, and exhibits optimum values in particular cases. In general, actuated undercutting may potentially give a more efficient cutting than conventional pick and disc cutting by demonstrating reasonably lower specific energy in a comparable cutting environment.
Key Words
actuated disc cutter; rock cutting performance; specific energy; undercutting mechanism
Address
- Hoyoung Jeong — Department of Energy Resources Engineering, Pukyong National University, 45 Yongso-ro Nam-gu Busan 48513, Republic of Korea
- Yudhidya Wicaksana — Center for Industrial Engineering, Institut Teknologi Bandung, Jalan Ganesha 10 Coblong Bandung 40132, Indonesia
- Sehun Kim and Seokwon Jeon — Department of Energy Resources Engineering, Research Institute of Energy and Resources, Seoul National University, 1 Gwanak-ro Gwanak-gu Seoul 08826, Republic of Korea
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