Journal
GEOMECHANICS AND ENGINEERING
Volume 29, Issue 3, Pages 359-368Publisher
TECHNO-PRESS
DOI: 10.12989/gae.2022.29.3.359
Keywords
actuated disc cutter; rock cutting performance; specific energy; undercutting mechanism
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Funding
- Korea Agency for Infrastructure Technology Advancement under Ministry of Land, Infrastructure and Transport in Korea [20CTAP-C151926-02]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2021R1G1A1091572]
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Undercutting using an actuated disc cutter (ADC) involves more complex cutting mechanism than traditional rock cutting does. By conducting laboratory-scale testing using ADC, it was found that ADC may potentially provide a more efficient cutting than traditional methods.
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.
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