Geotechnical Engineering (한국지반공학회지:지반)

Korean Geotechnical Society (한국지반공학회)
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Behavior and Analysis of Laterally Loaded Model Pile in Nak-dong River Fine Sand

  • Kim, Young-Su (Member, Professor, Dept. of Civil Engrg., Kyungpook Nat. Univ.) ;
  • Seo (Member, Associate Professor, Dept. of Civil Engrg., Kyungdong College, Member, Graduate Professor, Dept. of Civil Engrg., Kyungdong Nat. Univ., Member, Graduate Professor, Dept. of Civil Engrg., Kyungdong Nat. Univ.)
  • Published : 1998.06.01
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Abstract

This paper shows that there are the results of a series of model tests on the behavior of single pipe pile which is subjected to lateral load in, Nak-dong River sand. The purpose of the present paper is to estimate the effect of Non-homogeneity. constraint condition of pile head, lateral load velocity, relative density, and embedded length of pile on the behavior of single pile. These effects can be quantified only by the results of model tests. Also, these are compared with the results of the numerical methods (p-y method, modified Vlasov method; new ${\gamma}$ parameter, Characteristic Load Method'CLM). In this study, a new ${\gamma}$ parameter equation based on the Vlasov method was developed to calculate the modulus of subgrade reaction (E. : nhz.) proportional to the depth. The p-y method of analysis is characterized by nonlinear behavior. and is an effective method of designing deep foundations subjected to lateral loads. The new method, which is called the characteristic load method (CLM). is simpler than p-y analysis. but its results closely approximates p-y analysis results. The method uses dimensional analysis to characterize the nonlinear behavior of laterally loaded piles with respect to be relationships among dimensionless variables. The modulus of subgrade reaction used in p-y analysis and modified Vlasov method obtained from back analysis using direct shear test (DST) results. The coefficients obtained from DST and the modified ones used for the prediction of lateral behavior of ultimate soil reaction range from 0.014 to 0.05. and from 0.2 to 0.4 respectively. It is shown that the predicted numerical results by the new method (CLM), p-y analysis, and modified Vlasov method (new parameter) agree well with measured results as the relative density increases. Also, the characteristic load method established applicability on the Q-Mnu. relationship below y/D=0.2.

본 논문은 낙동강 유역의 사질토 지반에 매입되어 수평 하중을 받는 모형 강관 말뚝의 수평 거동의 결과를 관찰하였다. 본 연구의 목적은 말뚝의 수평 거동에 대한 말뚝의 근입길이, 지반 상대밀도, 하중 재하속도, 말뚝두부의 구속조건, 그리고 지반내의 이질층의 영향에 관하여 실험적인 연구를 수행하고 이러한 영향들을 정량화 할 수 있는 실험결과를 얻었다. 또한, 수치해석 (p-y method. modifiled Vlasov method, Characteristic Load Method:CLM) 결과들과 비교 되었다. 본 연구에서 Vlasov 해석법에 기초한 new parameter는 깊이에 비례하는 지반반력 (KhD=nhizn)에 대하여 적용할 수 있도록 개발하였다. p-V해석 모델은 비선형 거동이며, 수평하중을 받는 깊은 기초의 설계에 유효한 방법이다. Characteristic load method (CLM)이라 불 리는 새로운 방법은 P-V해석법 보다 간편하며, p-V해석법에 의한 결과와 잘 일치하고 있다. CLM방법은 무차훤 변수들의 관계들로부터 수평 하중을 받는 말뚝들의 비선형 거동을 특성화 하기 위하여 차원 해석을 이용하고 있다. p-y해석법과 수정 Vlasov방법에 이용하는 지반반력 계수와 극한 지반반력들은 직접 전단시험 결과들을 역 해석하여 구하였다. 직접전단 시험에 의한 지반반력 계수와 극한 지반반력들의 수평거동 예측에 이용하기 위한 수정계수들은 각각 0.014~0.05, 0.2~0.4로 나타났다. p-y analysis. modified Vlasov method (new ${\gamma}$ parameter), CLM에 의한 수치해석 결과들은 상대밀도가 증가할수록 실험결과들과 잘 일치하는 것으로 나타났다. 또한 y/D=0.2 이하에서 CLM 방법의 적용성이 입증되었다.

Keywords

References

  1. Pile behavior established from model tests v.116 no.GT. 4 Abendroth,R.E.;Greimann,L.F.
  2. J. Soil Mech. Found. Engrg. v.90 no.SM. 3 Lateral resistance of piles in cohesionless Broms,B.B.
  3. Can. Geotech. v.24 Nonlinear analysis of laterally loaded piles in cohesionless soils Budhu,M.;Davies,T.G.
  4. Geotechnique v.14 The movement of buried footings due to moment and horizontal load and the movement of anchor plates Douglas,D.J.;Davies,E.H.
  5. Rep. No. UCB/GT/82-04 Simplified analysis of laterally loaded piles Evans,L.T.Jr.;Duncan,J.M.
  6. Piling Engineering Fleming(et al.)
  7. Laterally loaded pile behavior v.108 no.1 Georgiadis,M.;Butterfield,R.
  8. Can. Geotech. v.29 Centrifugal testing of laterally loaded piles in sand Georgiadis(et al.)
  9. Proc. Of the Conf. Organized by the Institution of Civil Envineers in London Behavior of piles Jamiolkowski,M.B.
  10. Int. J. Mech. Sci. v.19 The Vlasov foundation model Jones,R.;Xenophontos,J.
  11. A study on the Lateral Behavior of Steel Pipe Piles Using the Modified Vlasov Model v.17 no.3 Kim,Y.S.;Seo,I.S.;Kim,B.T.;Kim,K.Y
  12. Model tests on the lateral behavior of steel pipe piles; in the Nak-dong river sand v.13 no.5 Kim,Y.S.;Kim,B.T.;Heo,N.Y.;Jung,S.G.
  13. 17th Int. Conf. on offshore Mech. and Arctic Eng.(OMAE), Session OFT-C12, paper 98-3099 Model tests and Analysis of Laterally Loaded Piles in Sand Kim,Y.S.;Kim,B.T.;Seo,I.S.;Bang,I.H.
  14. Hyperbolic stress-strain respones: cohesive soils v.89 no.1 Konder,R.L.
  15. Annales des Ponts et Chaussees v.VI Pieu vertical sollicite horizontalement Lenci,C.;Maurice,J.;Madignier,F.
  16. Paper subm. For publication in Journ Geotech. Div. In situ tests by flat dilatometer Marchetti,S.
  17. Pro. 2n Off. Tech. Conf., paper OTC 1204 Corelations for design of laterally loaded piles in soft clay Matlock,H.
  18. PhD thesis, Univ. of Canterbury The elastic behavior of a laterally loaded pile Matthewson,C.D.
  19. Trans. v.123 Soil modulus for laterally loaded piles McClelland,B.;Focht,J.A.Jr.
  20. Piling and Deep Found., Proc. 4th int. Conf. On Piling and Deep Found. Load-displacement behavior of laterally-load rigid drilled shafts in clay Mayne,P.W.;Kulhawy,F.H.
  21. J. of Geotech. Engrg. v.121 no.12 Laboratory modeling of laterally-loaded drilled shafts in clay Mayne,P.W.;Kulhawy,F.H.;Trautmann,C.H.
  22. analysis and design of pie foundations Evaluation of p-y relationships in cohesionless sois Murchison,J.M.;O'Neill,M.W.
  23. Two-parameter layer model for analysis of slab on elastic foundation v.113 no.GT. 9 Nogami,T.;Lam,Y.C.
  24. Soils and Foundations v.35 no.4 Model tests on single piles subjected to lateral soil movement Poulos,H.G.;Chen,L,T.;Hull,T.S.
  25. Proc. 6th Offshore Technol. Conf Analysis of laterally loaded piles in sand Reese,L.C.;Cox,W.R.;Koop,F.D.
  26. Proc. 7th Offshore Technol. Conf. Fields testing and analysis of laterally loaded piles in stiff clay Reese,L.C.;Cox,W.R.;Koop,F.D.
  27. Lateral loading of deep foundations in stiff clay v.101 no.GT. 7 Lateral loading of deep foundations in stiff clay Reese,L.C.;Welch,R.C.
  28. Lateral response of piles v.90 no.GT. 6 Lateral response of piles Spillers,W.R.;Stoll,R.D.
  29. Proc. Conf. On Num. Methods in Offshore Piling v.17 Unified method of analysis of laterally loaded piles in clay Sullivan,W.R.;Reese,L.C.;Fenske,C.W.
  30. Geotechnique v.5 Evaluation of coefficients of subgrade reaction Terzaghi,K.
  31. Full-scale cyclic dynamic lateral pile responses v.113 no.GT. 1 Ting,J.M.
  32. A parametric study of beams on elastic foundations v.113 no.GT. 1 Vallabhan,C.V.G.;Das,Y.C.
  33. Proc. 1988 ASME Pressure Vessel and Piping Conf. An improved model for beams on elastic foundations Vallabhan,C.V.G.;Das,Y.C.
  34. Modified vlasov model for beams on elastic foundation v.117 no.GT. 6 Vallabhan,C.V.G.;Das,Y.C.
  35. Beams, plates and shells on elastic foundations Vlasov,V.Z.;Leont'ev,N.N.
  36. Can. Geotech., J. v.29 Laterall pile response to monotonic pile head loading Yan,L.;Byrne,P.M.