Geomechanics and Engineering

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Evaluation of rock cutting efficiency of the actuated undercutting mechanism

  • Jeong, Hoyoung (Department of Energy Resources Engineering, Pukyong National University) ;
  • Wicaksana, Yudhidya (Center for Industrial Engineering, Institut Teknologi Bandung) ;
  • Kim, Sehun (Department of Energy Resources Engineering, Research Institute of Energy and Resources, Seoul National University) ;
  • Jeon, Seokwon (Department of Energy Resources Engineering, Research Institute of Energy and Resources, Seoul National University)
  • Received : 2021.12.15
  • Accepted : 2022.03.05
  • Published : 2022.05.10
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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.

Keywords

Acknowledgement

This study was funded by the Korea Agency for Infrastructure Technology Advancement under Ministry of Land, Infrastructure and Transport in Korea (Project No.: 20CTAP-C151926-02). This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2021R1G1A1091572).

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