Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지
DOI QR코드

DOI QR Code

The Numerical Analysis on the Behaviour of Combined Sheet Pile in the Reclaimed Ground Mixed by Sandy Soil and Clayey Soil

사질토와 점성토가 혼재하는 해안 매립지반에서 조합형 Sheet Pile의 거동에 관한 해석적 연구

  • Received : 2020.07.13
  • Accepted : 2020.08.28
  • Published : 2020.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the design method of the combined sheet pile was considered in the coastal landfill where sandy and clayey soils are mixed, and the behavior in excavation was analyzed. It was confirmed from the elasto-plastic analysis that the predicted behavior of the temporary facilities of earth retaining differs according to the type of the combined sheet pile method (Built up, Interlocking, Welding) and the analysis method (soldier pile method, continuous wall method). In the case of sheet pile member force, the results of the continuous wall analysis method predicted the most conservative results. When the stress ratio (calculation/allowance) of each member was analyzed based on the maximum member force of the combined sheet pile method, the maximum value was obtained for bending moment in the side pile and combined stress in the case of the strut. As a result of finite element analysis, the member force of the side pile was the largest in the short-term effective stress analysis condition, while the compressive force of the strut was large in the consolidation analysis. When comparing the results of the elasto-plastic analysis and the finite element analysis, the shear force of the side pile and the axial force of the strut were greatly evaluated in the elasto-plastic analysis, and the bending moment of the side pile was the largest in the short-term effective stress condition of the finite element analysis. In addition, the displacement of the side pile was predicted to be greater in the finite element analysis than in the elasto-plastic analysis.

본 연구에서는 사질토와 점성토가 혼재하는 해안 매립지반에서 조합형 Sheet Pile 공법의 설계법을 고찰하였고 지반 굴착시의 거동을 해석하였다. 조합형 Sheet Pile 공법의 형태(Built up, Interlocking, Welding) 및 해석방법(엄지말뚝법, 연속벽법)에 따라 흙막이 가시설의 예측 거동이 상이함을 탄소성 해석으로부터 확인하였다. Sheet Pile(측면말뚝) 부재력의 경우 연속벽체 해석법의 결과가 가장 보수적인 결과를 예측하였다. 조합형 Sheet Pile 공법의 최대 부재력을 토대로 각 부재별 응력비(발생/허용)를 분석하면 측면말뚝의 경우 휨, 버팀보의 경우 조합응력에서 최대값을 나타내었다. 유한요소해석결과 측면말뚝의 부재력은 단기 유효응력 해석 조건에서 가장 크게 나타난 반면, 버팀보의 압축력은 압밀 해석에서 크게 나타났다. 탄소성 해석과 유한요소해석 결과를 비교하면, 측면말뚝의 전단력과 버팀보의 축력은 탄소성 해석에서 크게 평가되었고, 측면말뚝의 휨은 유한요소해석의 단기 유효응력 조건에서 가장 큰 것으로 나타났다. 또한, 측면말뚝의 변위는 탄소성 해석보다는 유한요소해석에서 더 크게 예측되었다.

Keywords

References

  1. ArcelorMittal (2020), The HZ-M Steel Wall System 2020.
  2. AS 4678 (2002), Earth Retaining Structures, Standards Australia.
  3. Bouduin et al. (2000), "Back Analysis of Staged Embankment Failure: The Case Study streefkerk", Beyond 2000 in Computational Geotechnics, Besix.
  4. Cho, K. J. (2014), Numerical and Experimental Study for Application of Sheet Pile Retaining Wall Reinforced with H-pile, GangWon University, Master Science.
  5. EAB (2006), Recommendations on Excavations in Germany, Ernst & Sohn.
  6. Halla (2020), A Report on the Safety Review of the Water Pump Facility at Hyundai Oilbank's Seawater Coolant Drainage Facility.
  7. Hyundai Oil Bank (H.O.B, 2013), The Report for Constructing DaeJuk Industrial Estate.
  8. Hyundai Steel (2020), Steel Sheet Pile Manual.
  9. Kempfert and Gebreselassie (2006), Excavations and Foundations in Soft Soils, Springer.
  10. Kim, B. I., Choi, C. Y., Hong, K. H., and Han, S. J. (2018), "Embankment and Excavation Behaviour with Shear Parameters of Soft Clayey Soil in FEM", Journal of The Korean Geotechnical Society, Vol.34, No.2, pp.5-17. https://doi.org/10.7843/kgs.2018.34.2.5
  11. Kim, K. L., Kim, Y. S., and Kim, S. S (2013), "A Study on Securing safety through Behavior Analysis of Earth Retaining Wall", J. Korean Geosynthetics Society, Vol.12 No.4 December. 2013 pp.11-19. https://doi.org/10.12814/jkgss.2013.12.4.011
  12. Lee, K. N. (2018), The Parameter Analysis for Optimal Design of H-Pile/Plastic Sheet Pile Method, Chungnam National University, Ph.D Dissertation.
  13. Ministry of Land, Infrastructure and Transport (M.L.I.T., 2019), Code for Design of Steel Bridges (Allowed Stress Design Method).
  14. Ministry of Oceans and Fisheries (M.O.F., 2016), Code for Design of Harbors and Ports.
  15. Nippon Steel and Sumitomo (2016), "Approach To Development Of Overseas Construction Steel Product Market in The Civil Engineering Field", Nippon Steel and Sumitomo Metal Technical Report, No.113, December 2016.
  16. Park, J. W. (2014), Study In Stiffened Sheet Pile Method-The Applicability and The Improvement Effect of Placement in Rock, Hanyang University, Master Science.