Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Concrete plug cutting using abrasive waterjet in the disposal research tunnel

연마재 워터젯을 활용한 처분터널 내 콘크리트 플러그 절삭

  • Cha, Yohan (Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Geon Young (Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute) ;
  • Hong, Eun-Soo (HBC Inc.) ;
  • Jun, Hyung-Woo (Jeyoung Engineering & Construction) ;
  • Lee, Hang-Lo (Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute)
  • 차요한 (한국원자력연구원 처분성능실증연구부) ;
  • 김건영 (한국원자력연구원 처분성능실증연구부) ;
  • 홍은수 ((주)에이치비씨) ;
  • 전형우 ((주)제영E&C) ;
  • 이항로 (한국원자력연구원 처분성능실증연구부)
  • Received : 2022.01.20
  • Accepted : 2022.02.18
  • Published : 2022.03.31
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Abstract

Waterjet has been comprehensively used in urban areas owing to a suitable technique for cutting concrete and rock, and low noise and vibration. Recently, the abrasive waterjet technique has been adopted and applied by the Korea Atomic Energy Research Institute to demolish concrete plugging without disturbing and damaging In-situ Demonstration of Engineered Barrier System in the disposal research tunnel. In this study, the use of abrasive waterjet in the tunnel was evaluated for practical applicability and the existing cutting model was compared with the experimental results. As a variable for waterjet cutting, multi-cutting, water flow rate, abrasive flow rate, and standoff distance were selected for the diversity of analysis. As regarding the practical application, the waterjet facilitated path selection for cutting the concrete plugging and prevented additional disturbances in the periphery. The pump's noise at idling was 64.9 dB which is satisfied with the noise regulatory standard, but it exceeded the standard at ejection to air and target concrete because the experiment was performed in the tunnel space. The experimental result showed that the error between the predicted and measured cutting volume was 12~13% for the first cut and 16% for second cut. The standoff distance had a significant influence on the cutting depth and width, and the error tended to decrease with decrement of standoff distance.

워터젯은 콘크리트와 암석 절삭에 적합하며 소음과 진동이 적어 도심지 시공에 널리 활용되는 기술이다. 최근 한국원자력연구원은 처분터널 내 공학적방벽의 열-수리-역학적 복합거동 현장시험의 콘크리트 플러그를 교란 및 손상 없이 해체하기 위해 연마재 워터젯 기술을 채택 및 적용하였다. 본 연구에서는 플러그 해체를 통한 연마재 워터젯의 터널 내 적용성을 평가하였고, 절삭 결과를 개발된 절삭 모델 결과와 비교하였다. 현장 적용성에 관해서는, 워터젯 활용은 경로선택이 용이하였으며 주변부의 추가적인 교란을 발생시키지 않았다. 펌프의 소음은 공회전 시 64.9 dB로 국내 생활소음·진동의 규제기준을 만족하였으나 공중 분사 및 절삭 시에는 터널 내에서 측정되어 그 기준을 상회한 것으로 나타났다. 절삭 모델 검증을 위해 연마재 워터젯의 반복 절삭, 유량, 연마재 투입량 및 이격거리를 주요 변수로 선정하였고 절삭 모델로 계산된 절삭 부피와 측정된 부피의 오차는 1회 절삭 시 12~13%, 2회 절삭 시 16%를 보였다. 절삭 깊이와 폭은 이격거리에 큰 영향을 받았으며, 이격거리가 작을수록 오차가 감소하는 경향을 보였다.

Keywords

Acknowledgement

이 논문은 2022년도 정부(과학기술정보통신부)의 재원으로 사용후핵연료관리핵심기술개발사업단 및 한국연구재단의 지원(2021M2E1A1085193)을 받아 수행된 연구 사업입니다.

References

  1. Ahmed, S., El, M., Amro, Y. (2020), "Enhancement of cutting quality of abrasive waterjet by using multipass cutting strategy", Journal of Manufacturing Processes, Vol. 60, pp. 530-543. https://doi.org/10.1016/j.jmapro.2020.10.036
  2. Cha, Y., Oh, T.M., An, T.Z., Cho, G.C. (2017), "The state of abrasive waterjet technologies for construction in Korea", Proceedings of the 6th International Young Geotechnical Engineers Conference, 17 September 2017, Seoul, pp. 86-87.
  3. Cha, Y., Oh, T.M., Cho, G.C. (2019), "Waterjet erosion model for rock-like material considering properties of abrasive and target materials", Applied Sciences, Vol. 9, No. 20, 4234. https://doi.org/10.3390/app9204234
  4. Cha, Y., Oh, T.M., Cho, G.C. (2020), "Effect of focus geometry on the hard rock cutting performance of an abrasive waterjet", Advances in Civil Engineering, Vol. 2020, pp. 1-13.
  5. Cha, Y., Oh, T.M., Joo, G.W., Cho, G.C. (2021), "Performance and reuse of steel shot in abrasive waterjet cutting of granite", Rock mechanics and Rock Engineering, Vol. 54, pp. 1551-1563. https://doi.org/10.1007/s00603-020-02332-8
  6. Chen, C., Pan, D., Yang, L., Zhang, H., Li, B., Jin, C., Li, X., Cheng, Y., Zhong, X. (2019), "Investigation into the water jet erosion efficiency of hydrate-bearing sediments based on the Arbitrary Lagrangian-Eulerian Method", Applied Sciences, Vol. 9, No. 1, 182. https://doi.org/10.3390/app9010182
  7. El-Domiaty, A.A., Abdel-Rahman, A.A. (1997), "Fracture mechanics-based model of abrasive waterjet cutting for brittle materials", The International Journal of Advanced Manufacturing Technology, Vol. 13, pp. 172-181. https://doi.org/10.1007/BF01305869
  8. Engin, I.C., Bayram, F., Yasitli, N.E. (2013), "Experimental and statistical evaluation of cutting methods in relation to specific energy and rock properties", Rock Mechanics and Rock Engineering, Vol. 46, No. 4, pp. 755-766. https://doi.org/10.1007/s00603-012-0284-4
  9. Gostimirovic, M., Pucovsky, V., Sekulic, M., Rodic, D., Pejic, V. (2019), "Evolutionary optimization of jet lag in the abrasive water jet machining", The International Journal of Advanced Manufacturing Technology, Vol. 101, pp. 3131-3141. https://doi.org/10.1007/s00170-018-3181-5
  10. Haghbin, N., Spelt, J.K., Papini, M. (2015), "Abrasive waterjet micro-machining of channels in metals: comparison between machining in air and submerged in water", International Journal of Machine Tools and Manufacture, Vol. 88, pp. 108-117. https://doi.org/10.1016/j.ijmachtools.2014.09.012
  11. Hashish, M. (1984), "A modeling study of metal cutting with abrasive waterjets", Journal of Engineering Materials and Technology, Vol. 106, No. 1, pp. 88-100. https://doi.org/10.1115/1.3225682
  12. Hashish, M. (1989), "Pressure effects in abrasive-waterjet (AWJ) machining", Journal of Engineering Materials and Technology, Vol. 111, No. 3, pp. 221-228. https://doi.org/10.1115/1.3226458
  13. Hlavac, L.M., Hlavacova, I.M., Geryk, V. (2017), "Taper of kerfs made in rocks by abrasive water jet (AWJ)", The International Journal of Advanced Manufacturing Technology, Vol. 88, No. 1, pp. 443-449. https://doi.org/10.1007/s00170-016-8782-2
  14. Hloch, S., Valicek, J., Radvanska, A. (2007), "Noise evaluation at abrasive waterjet cutting of materials by means of factor analysis", Nonconventional Technologies Review, No. 1, pp. 37-42.
  15. Huang, M., Kang, Y., Long, X., Wang, X., Hu, Y., Li, D., Zhang, M. (2017), "Effects of a nano-silica additive on the rock erosion characteristics of a SC-CO2 jet under various operating conditions, Applied Sciences, Vol. 7, No. 2, 153. https://doi.org/10.3390/app7020153
  16. Hutt, R. (2004), Literature review: noise from high pressure water jetting, HSL/2004/15, Health and Safety Laboratory.
  17. Igarashi, S., Bentur, A., Mindess, S. (1996), "Microhardness testing of cementitious materials", Advanced Cement Based Materials, Vol. 4, No. 2, pp. 48-57. https://doi.org/10.1016/S1065-7355(96)90051-6
  18. Jung, S.J., Prisbrey, K., Wu, G. (1994), "Prediction of rock hardness and drillability using acoustic emission signatures during indentation", International Journal of Rock Mechanics and Mining & Geomechanics Abstracts, Vol. 31, No. 5, pp. 561-567. https://doi.org/10.1016/0148-9062(94)90159-7
  19. Karakurt, I., Aydin, G., Aydiner, K. (2012), "An experimental study on the depth of cut of granite in abrasive waterjet cutting", Materials and Manufacturing Processes, Vol. 27, No. 5, pp. 538-544. https://doi.org/10.1080/10426914.2011.593231
  20. Kim, G.Y., Kim, K., Lee, J.Y., Cho, W.J., Kim, J.S. (2017), "Current status of the KURT and long-term in-situ experiments", Journal of the Korean Society of Mineral and Energy Resources Engineers, Vol. 54, No. 4, pp. 334-357.
  21. Kim, G.Y., Lee, J.O., Cho, W.J., Baik, M.H. (2019), "In-situ demonstration of engineered barrier system (In-DEBS) for characterization of coupled THM behavior in KURT", Journal of the Korean Radioactive Waste Society, Vol. 17, pp. 1-14.
  22. Kim, J.G., Song, J.J., Han, S.S., Lee, C.I. (2012), "Slotting of concrete and rock using an abrasive suspension waterjet system", KSCE Journal of Civil Engineering, Vol. 16, No. 4, pp. 571-578. https://doi.org/10.1007/s12205-012-1411-1
  23. Kim, J.K., Kim, C.Y., Yi, S.T., Lee, Y. (2009), "Effect of carbonation on the rebound number and compressive strength of concrete", Cement and Concrete Composites, Vol. 31, No. 2, pp. 139-144. https://doi.org/10.1016/j.cemconcomp.2008.10.001
  24. Kim, K., Milstein, F. (1987), "Relation between hardness and compressive strength of polymer concrete", Construction and Building Materials, Vol. 1, No. 4, pp. 209-214. https://doi.org/10.1016/0950-0618(87)90033-X
  25. Kumar, N., Shukla, M. (2012), "Finite element analysis of multi-particle impact on erosion in abrasive water jet machining of titanium alloy", Journal of Computational and Applied Mathematics, Vol. 236, No. 18, pp. 4600-4610. https://doi.org/10.1016/j.cam.2012.04.022
  26. Momber, A.W. (1998), "The kinetic energy of wear particles generated by abrasive-water-jet erosion", Journal of Materials Processing Technology, Vol. 83, No. 1-3, pp. 121-126. https://doi.org/10.1016/S0924-0136(98)00050-8
  27. Momber, A.W. (2014), "Effects of target material properties on solid particle erosion of geomaterials at different impingement velocities", Wear, Vol. 319, No. 1-2, pp. 69-83. https://doi.org/10.1016/j.wear.2014.07.007
  28. Momber, A.W., Kovacevic, R. (1997), Principles of Abrasive Water Jet machining, Springer Science & Business Media, Berlin, Germany, pp. 212.
  29. Nanduri, M., Taggart, D.G., Kim, T.J. (2002), "The effect of system and geometric parameters on abrasive water jet nozzle wear", International Journal of Machine Tools and Manufacture, Vol. 42, No. 5, pp. 615-623. https://doi.org/10.1016/S0890-6955(01)00147-X
  30. Oh, T.M., Cho, G.C. (2016), "Rock cutting depth model based on kinetic energy of abrasive waterjet", Rock Mechanics and Rock Engineering, Vol. 49, No. 3, pp. 1059-1072. https://doi.org/10.1007/s00603-015-0778-y
  31. Oh, T.M., Cho, G.C., Ji, I.T. (2013), "Effect of free surface using waterjet cutting for rock blasting excavation", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 1, pp. 49-57. https://doi.org/10.9711/KTAJ.2013.15.1.049
  32. Oh, T.M., Park, D.Y., Park, J.S., Cho, G.C. (2021), "Analysis of rock removal shape according to overlapping width of waterjet cutting", Journal of Korean Tunnelling and Underground Space Association, Vol. 23, No. 3, pp. 167-181. https://doi.org/10.9711/KTAJ.2021.23.3.167
  33. Radvanska, A., Ergic, T., Ivandic, Z., Hloch, S., Valicek, J., Mullerova, J. (2009), "Technical possibilities of noise reduction in material cutting by abrasive water-jet", Strojarstvo, Vol. 51, No. 4, pp. 347-354.
  34. Ramulu, M., Arola, D. (1994), "The influence of abrasive water jet cutting conditions on the surface quality of graphite/epoxy laminate", International Journal of Machine Tools and Manufacture, Vol. 34, No. 3, pp. 295-313. https://doi.org/10.1016/0890-6955(94)90001-9
  35. Song, K.I., Oh, T.M., Cho, G.C. (2014), "Precutting of tunnel perimeter for reducing blasting-induced vibration and damaged zone: numerical analysis", KSCE Journal of Civil Engineering, Vol. 18, No. 4, pp. 1165-1175. https://doi.org/10.1007/s12205-014-0393-6
  36. Summers, D.A. (2003), Waterjetting Technology, CRC Press, London, UK, pp. 8-12.
  37. Susuzlu, T., Hoogstrate, A.M., Karpuschewski, B. (2004), "Initial research on the ultra-high pressure waterjet up to 700 MPa", Journal of Materials Processing Technology, Vol. 149, No. 1-3, pp. 30-36. https://doi.org/10.1016/j.jmatprotec.2003.11.044
  38. Szilagyi, K., Borosnyoi, A., Zsigovics, I. (2015), "Understanding the rebound surface hardness of concrete", Journal of Civil Engineering and Management, Vol. 21, No. 2, pp. 185-192. https://doi.org/10.3846/13923730.2013.802722
  39. Winslow, D.N. (1984), "A rockwell hardness test for concrete", Cement, Concrete and Aggregates, Vol. 6, No. 2, pp. 137-141. https://doi.org/10.1520/CCA10366J
  40. Yong, Z., Kovacevic, R. (1997), "Effect of water mixture film on impact contact in abrasive waterjet machining", International Journal of Mechanical Sciences, Vol. 39, No. 6, pp. 729-739. https://doi.org/10.1016/S0020-7403(96)00071-9
  41. Zeng, J., Kim, T.J. (1996), "An erosion model of polycrystalline ceramics in abrasive waterjet cutting", Wear, Vol. 193, No. 2, pp. 207-217. https://doi.org/10.1016/0043-1648(95)06721-3
  42. Zhang, M., He, Z., Zhang, Y., Wang, X., Zhao, S., Fu, T., Chen, L. (2019), "Theoretical and finite element analysis of residual stress field for different geometrical features after abrasive waterjet peening", Journal of Pressure Vessel Technology, Vol. 141, No. 1, PVT-18-1066.
  43. Zhu, H.T., Huang, C.Z., Wang, J., Zhao, G.Q., Li, Q.L. (2009), "Modeling material removal in fracture erosion for brittle materials by abrasive waterjet", Advanced Material Research, Vol. 76-78, pp. 357-362. https://doi.org/10.4028/www.scientific.net/AMR.76-78.357