Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
권호 표지
DOI QR코드

DOI QR Code

A Study of Lateral Resistance of Block Breakwater Combined with Piles

수치해석을 이용한 말뚝이 결합된 블록식방파제의 수평저항력에 관한 연구

  • Lee, Won-Hyo (Dept. of Civil and Environmental Engineering, Korea Maritime and Ocean University) ;
  • Kwon, Soon-Goo (Dept. of Civil and Environmental Engineering, Korea Maritime and Ocean University) ;
  • Kim, Tae-Hyung (Dept. of Civil Engineering, Korea Maritime and Ocean University)
  • 이원효 (한국해양대학교 대학원 토목환경공학과) ;
  • 권순구 (한국해양대학교 대학원 토목환경공학과) ;
  • 김태형 (한국해양대학교 물류.환경.도시인프라공학부 건설공학전공)
  • Received : 2022.07.14
  • Accepted : 2022.08.19
  • Published : 2022.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Three-dimensional FEM numerical analysis was performed to understand the behaviors of blocks and piles according to the horizontal load for the block breakwater combined with piles. The Modified Mohr-Coulomb model, the improved version of the Mohr-Coulomb model, was applied for the ground modeling. The cases when the pile is embedded only into the block, embedded to the riprap layer (H = 4.29 cm), and embedded to the ground down to 2H, 3H, and 4H were examined. The results of the laboratory model experiment and the numerical analysis showed similar horizontal resistance force-displacement behaviors. The pile showed rotational behavior up to the embedment depth of 1H~2H and bending behavior in the case of 3H~4H depth embedment. When the embedment depth of the pile is 3H or more, the pile shows a bending behavior, so it can be considered that the pile contributes significantly to the horizontal resistance of the block breakwater. The results of this study will be used for various numerical analyses for real-size structure design.

본 연구는 말뚝이 결합된 블록식방파제에 대하여 수평하중 재하에 따른 블록과 말뚝의 거동을 파악하기 위하여 FEM 3차원 수치해석을 실시하였다. 지반구성모델은 Mohr-Coulomb 모델을 향상시킨 Modified Mohr Coulomb 모델을 적용하였다. 말뚝이 블록에만 관입된 경우, 사석층(H = 4.29 cm)까지 근입된 경우, 원지반속에 근입된 2H, 3H, 4H의 경우에 검토하였다. 실내모형실험 결과와 수치해석를 비교한 결과, 수평저항력-변위가 서로 유사한 거동을 보이는 것으로 나타났다. 말뚝의 근입깊이가 1H~ 2H까지는 말뚝이 회전거동을 보이고, 3H~4H의 경우에는 휨거동 양상을 보이는 것으로 해석되었다. 말뚝의 근입깊이가 3H 이상인 경우에는 말뚝이 휨거동을 보이므로 말뚝이 블록식방파제의 수평저항력에 크게 기여한다고 볼 수 있다. 본 연구 결과는 실제 크기 구조물 설계를 위한 다양한 수치해석 시 자료로 활용이 있을 것이다.

Keywords

References

  1. Abdel-Fattah, T.T., Abdel-Rahman, A.M. and Hodhod, H.A. (2005). Applicability of elastoplastic modelling for simulating tunnel excavation in lightly overconsolidated clay. Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing, B.H.V.Topping (Editor), Scotland, 657-658.
  2. Bae, J.S., Kwon, M.J. and Kim, S.H. (2006). The study of group piles under lateral soil movement in sand by model test. Journal of the Korean Geotechnical Society, 22(10), 165-172 (in Korean). https://doi.org/10.7843/KGS.2006.22.10.165
  3. Chung, J.S., Shin, Y.W., Kim, M.H., Kook, Y.M., Jeong, K.Y., Kim, P.S. and Lee, S.H. (2020). A study on the displacement behavior according to the analysis model of ground excavation, Journal of the Korean Geo-Environmental Society, 19(4), 27-32 (in Korean).
  4. Goda, Y. (1973). Study on design wave pressure on breakwater. Report of port and Harbor Res. Inst., 12(3), 31-69.
  5. Hwang, W.K., Kim, T.H., Kim, D.S., Oh, M. and Park, J.Y. (2018). Effect of wave-induced seepage on the stability of the rubble mound breakwater. Journal of Korean Geotechnical Society, 34(4), 13-27 (in Korean).
  6. Iai, S. (1989). Similitude for shaking table tests on soil-structure-fluid model in 1g gravitational field. Soil and Foundations, 29(1), 105-118. https://doi.org/10.3208/sandf1972.29.105
  7. Kang, G., Kim, J., Kim, T.H., Lee, S. and Kim, J. (2021). Lateral resistance of block type breakwater with piles to depth of embedment. Journal of Korean Society of Coastal and Ocean Engineers, 33(2), 65-72 (in Korean). https://doi.org/10.9765/KSCOE.2021.33.2.65
  8. Kim, T.H., Kim, J., Choi, J.S. and Kang, G. (2020). Evaluation of lateral resistance for tie-cell wave-dissipating block by model experiments. Journal of The Korean Geotechnical Society, 36(12), 87-97 (in Korean). https://doi.org/10.7843/KGS.2020.36.12.87
  9. Ministry of Oceans and Fisheries. (2017). Port and fishing port Korea design standard (KDS 64 00 00).