Geomechanics and Engineering

  • 제29권3호
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  • Pages.359-368
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

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)
  • 투고 : 2021.12.15
  • 심사 : 2022.03.05
  • 발행 : 2022.05.10
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

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).

참고문헌

  1. Bilgin, N., Copur, H. and Balci, C. (2014), Mechanical Excavation in Mining and Civil Industries, CRC Press, Boca Raton, FL, USA.
  2. Cho, J.W., Jeon, S., Jeong, H.Y. and Chang, S.H. (2013), "Evaluation of cutting efficiency during TBM disc cutter excavation within a Korean granitic rock using linear-cutting-machine testing and photogrammetric measurement", Tunn. Undergr. Sp. Tech., 35, 37-54. https://doi.org/10.1016/j.tust.2012.08.006.
  3. Chang, S., Lee, C., Kang, T., Ha, T. and Choi, S. (2017), "Effect of hardfacing on wear reduction of pick cutters under mixed rock conditions", Geomech. Eng., 13(1), 141-159. https://doi.org/10.12989/gae.2017.13.1.141.
  4. Copur, H., Bilgin, N., Balci, C., Tumac, D. and Avunduk, E. (2017), "Effects of different cutting patterns and experimental conditions on the performance of a conical drag tool", Rock Mech. Rock Eng., 50, 1585-1609. https://doi.org/10.1007/s00603-017-1172-8.
  5. Dehkhoda, S. and Detournay, E. (2017), "Mechanics of actuated disc cutting", Rock Mech. Rock Eng., 50(2), 465-483. https://doi.org/10.1007/s00603-016-1121-y.
  6. Dehkhoda, S. and Detournay, E. (2018), "Rock cutting with an actuated disc: an experimental study", Proceedings of the 52nd U.S Rock mechanics/Geomechanics symposium, Seattle, Washington. June.
  7. Dehkhoda, S. and Detournay, E. (2019), "Rock cutting experiments with an actuated disc", Rock Mech. Rock Eng., 52(9), 3443-3458. https://doi.org/10.1007/s00603-019-01767-y.
  8. Dehkhoda, S. and Hill, B. (2019), "Clearance angle and evolution of depth of cut in actuated disc cutting", J. Rock Mech. Geotech. Eng., 11(3), 644-658. https://doi.org/10.1016/j.jrmge.2018.12.010.
  9. Hood, M. and Alehossein, H. (2000), "A development in rock cutting technology", Int. J. Rock Mech. Min. Sci., 37, 297-305. https://doi.org/10.1016/S1365-1609(99)00107-0.
  10. Hood M. and Roxborough, F. (1992), SME Mining Engineering Handbook, (2nd Edition), Society of Mining, Metallurgy, and Exploration, Englewood, CO, USA.
  11. Jeong, H., Cho, J., Jeon, S. and Rostami, J. (2016), "Performance assessment of hard rock TBM and rock boreability using punch penetration test", Rock Mech. Rock Eng., 49, 1517-1532. https://doi.org/10.1007/s00603-015-0834-7.
  12. Jeong, H. and Jeon, S. (2018), "Characteristic of size distribution of rock chip produced by rock cutting with a pick cutter", Geomech. Eng., 15(3), 811-822. https://doi.org/10.12989/gae.2018.15.3.811.
  13. Jeong, H., Choi, S., Lee, S. and Jeon, S. (2020a), "Rock cutting simulation of point attack picks using the smooth particle hydrodynamics technique and the cumulative damage model", Appl. Sci., 10, 5314. https://doi.org/10.3390/app10155314.
  14. Jeong, H., Wicaksana, Y., Kim, S. and Jeon, S. (2020b), "Fundamental study on rock cutting by an actuated undercutting disc", Tunn. Undergr. Sp., 30(6), 592-602. https://doi.org/10.7474/TUS.2020.30.6.591.
  15. Jeong, H., Choi, S. and Jeon, S. (2020c), "Effect of skew angle on the cutting performance and cutting stability of point-attack type picks", Tunn. Undergr. Sp. Tech., 103, 103507. https://doi.org/10.1016/j.tust.2020.103507.
  16. Jeong, H., Wicaksana, Y., Kim, S. and Jeon, S. (2021), "Assessment of rock cutting efficiency of an actuated undercutting disc", J. Korean Tunn Undergr Sp. Assoc., 23(3), 199-209. https://doi.org/10.9711/KTAJ.2021.23.3.199.
  17. Karekal, S. (2013), "Oscillating disc cutting technique for hard rock excavation", Proceedings of 47th U.S. Rock Mechanics/Geomechanics Symposium, San Francisco, California, June.
  18. Kim, K., Jo, S., Ryu, H. and Cho, G. (2020), "Prediction of TBM performance based on specific energy", Geomech. Eng., 22(6), 489-496. https://doi.org/10.12989/gae.2020.22.6.489.
  19. Kovalyshen, Y. (2015), "Analytical model of oscillatory disc cutting", Int. J. of Rock Mech. Min. Sci., 77, 378-383. https://doi.org/10.1016/j.ijrmms.2015.04.015.
  20. Pan, Y., Liu, Q., Peng, X., Liu, Q., Liu, J., Huang, X., Cui, X. and Cai, T. (2019), "Full-scale linear cutting tests to propose some empirical formulas for TBM disc cutter performance prediction", Rock Mech. Rock Eng., 52, 4763-4783. https://doi.org/10.1007/s00603-019-01865-x.
  21. Ramezanzadeh, A. and Hood, M. (2010), "A state-of-the-art review of mechanical rock excavation technologies", Int. J. Min. Reclam. Environ., 1(1), 29-39.
  22. Xu, R. and Dehkhoda S. (2019), "Effect of actuation on rock fragmentation in undercutting discs", Proceedings of the 53rd U.S. Rock Mechanics/Geomechanics Symposium, New York, New York, June.
  23. Xu, R., Dehkhoda, S., Hagan, P. and Oh, Y. (2021), "Evaluation of cutting fragments in relation to force dynamics in actuated disc cutting", Int. J. Rock Mech. Min. Sci., 146, 104850. https://doi.org/10.1016/j.ijrmms.2021.104850.
  24. Zhu, X., Liu, W. and Lv, Y. (2017), "The investigation of rock cutting simulation based on discrete element method", Geomech. Eng., 13(6), 977-995. https://doi.org/10.12989/gae.2017.13.6.977.
  25. Zhang, G., Dang, W., Herbst, M. and Song, Z. (2020), "Complex analysis of rock cutting with consideration of rock-tool interaction using distinct element method (DEM)", Geomech. Eng., 20(5), 421-432. https://doi.org/10.12989/gae.2020.20.5.421.