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Development of optimum design from static response of pile–raft interaction

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Abstract

Piled raft foundations are among the most commonly used support structures for offshore projects. When a raft foundation alone does not satisfy the design requirements, piles may be added to improve the ultimate load capacity and the settlement performance of the raft. In this study, design criteria were developed for the undrained behavior of a piled raft system based on an examination of average and differential settlements, raft bending moment, and pile butt load ratio. Raft settlements were evaluated by a series of three-dimensional finite element analyses. The average settlement values for the piled raft were highly influenced by the number of piles and the raft thickness. Optimal design configurations of piles for cohesive soils are discussed. Increasing the pile spacing decreased the pile butt load ratio by allowing for a more uniform load distribution between the piles.

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Abbreviations

B r :

Raft width

L :

Length of the pile

S avg :

Piled raft average settlement

S UR, ave :

Raft average settlement

K pr :

Stiffness of the piled raft

K p :

Stiffness of the pile group

K r :

Stiffness of the raft alone

α rp :

Raft–pile interaction factor

P r :

Load capacity of the raft

P t :

Total applied load

r c :

Average radius of pile cap

r 0 :

Radius of the pile

∆w :

Additional settlement of a pile caused by an adjacent pile

ρ :

Homogeneity of the soil

r r :

Radius of the raft

r p :

Radius of the pile

v s :

Poisson ratio of soil

E sl :

Soil Young’s modulus at level of pile tip

E sb :

Soil Young’s modulus of bearing stratum below pile tip

E sav :

Average soil Young’s modulus along pile shaft

k p :

Overall stiffness of pile group

w pr :

Settlement of a piled raft foundation

P p :

Total load carried by pile group

R ref :

Piled raft to raft reference displacement ratio

t r :

Raft thickness

R avg :

Normalized piled raft average settlement

E s :

Soil elastic modulus

S d :

Normalized differential settlement

q :

Applied uniform load

R pl :

Pile butt load ratio

References

  1. Clancy P, Randolph MF (1993) An approximate analysis procedure for piled raft foundations. Int J Numer Anal Method Geomech 17(2):849–869

    Article  Google Scholar 

  2. Ta LD, Small JC (1996) Analysis of piled raft systems in layered soils. Int J Numer Anal Method Geomech 20:57–72

    Article  MATH  Google Scholar 

  3. Viggiani C (1998) Pile groups and piled rafts behaviour. In: Proceedings of the 3th international geotechnical seminar on deep foundations on bored and auger piles, Ghent, pp 77–94

  4. Poulos HG (1994) An approximate numerical analysis of pile-raft interaction. Int J Numer Anal Method Geomech 18(2):73–92

    Article  Google Scholar 

  5. Horikoshi K, Randolph MF (1996) Centrifuge modelling of piled raft foundations on clay. Géotechnique 46(4):741–752

    Article  Google Scholar 

  6. Prakoso WA, Kulhawy FH (2001) Contribution to piled raft foundation design. J Geotech Geoenviron Eng 127(1):17–24

    Article  Google Scholar 

  7. Russo G, Viggiani,C (1998) Factors controlling soil-structure interaction for piled rafts, In: International conference on soil-structure interaction in Urban Civil Engineering, pp 297–322

  8. Poulos HG (2001) Piled raft foundations: design and applications. Géotechnique 51:95–113

    Article  Google Scholar 

  9. Cho J, Lee J, Jeong S, Lee J (2012) The settlement behavior of piled raft in clay soils. Ocean Eng 53:153–163

    Article  Google Scholar 

  10. Ibsen LB, Barari A, Larsen KA (2012) Modified vertical bearing capacity for circular foundations in sand using reduced friction angle. Ocean Eng 47:1–6

    Article  Google Scholar 

  11. Ibsen LB, Larsen KA, Barari A (2014) Calibration of failure criteria for Bucket foundations on drained sand under general loading. J Geotech Geoenviron Eng 140(7):04014033. doi:10.1061/(ASCE)GT.1943-5606.0000995

  12. Ibsen LB, Barari A, Larsen KA (2014) An adaptive plasticity model for Bucket foundations. J Eng Mech ASCE 140(2):361–373

    Article  Google Scholar 

  13. Eicher JA, Guan H, Jeng DS (2003) Stress and deformation of offshore piles under structural and wave loading. Ocean Eng 30:369–385

    Article  Google Scholar 

  14. Barari A, Ibsen LB (2012) Undrained response of Bucket foundations to moment loading. Appl Ocean Res 36:12–21

    Article  Google Scholar 

  15. Barari A, Ibsen LB (2014) Vertical capacity of bucket foundations in undrained soil. J Civil Eng Manag 20(3):360–371. doi:10.3846/13923730.2013.801915

  16. Randolph MF (1994) Design methods for pile groups and piled rafts. S.O.A report, 13 ICSMFE, New Delhi, 5, 61–82

  17. Poulos HG, Small JC, Ta LD, Sinha J, Chen L (1997) Comparison of some methods for analysis of piled rafts. In: Proceedings 14th International Conference Soil Mechnics Foundation Engng, Hamburg 2, pp 1119–1124

  18. El Naggar MH, Novak M (1996) Nonlinear analysis for dynamic lateral pile response. Soil Dyn Earthq Eng 15:233–244

    Article  Google Scholar 

  19. Jang TS, Sung HG (2012) A new semi-analytical method for the non-linear static analysis of an infinite beam on a non-linear elastic foundation: a general approach to a variable beam cross-section. Int J NonLinear Mech 47:132–139

    Article  Google Scholar 

  20. Jang TS (2014) A general method for analyzing moderately large deflections of a non-uniform beam: an infinite Bernoulli-Euler-von Kármán beam on a nonlinear elastic foundation. Acta Mech 225(7):1967–1984. doi:10.1007/s00707-013-1077-x

  21. Brown PT, Wiesner TJ (1975) The behaviour of uniformly loaded piled strip footings. Soils Found 15(4):13–21

    Article  Google Scholar 

  22. Russo G (1998) Numerical analysis of piled rafts. Int J Numer Anal Methods Geomech 22(6):477–493

    Article  MATH  Google Scholar 

  23. Butterfield R, Banerjee PK (1971) The problem of pile group-pile cap interaction. Géotechnique 21(2):135–142

    Article  Google Scholar 

  24. Kuwabara F (1989) An elastic analysis for piled raft foundations in a homogeneous soil. Soils Found 29(1):82–92

    Article  Google Scholar 

  25. Hain SJ, Lee IK (1978) The analysis of flexible raft-pile systems. Géotechnique 28(1):65–83

    Article  Google Scholar 

  26. Mendonça AV, de Paiva JB (2003) An elastostatic FEM/BEM analysis of vertically loaded raft and piled raft foundation. Eng Anal Bound Elem 27:919–933

    Article  MATH  Google Scholar 

  27. Reul O, Randolph MF (2003) Piled rafts in overconsolidated clay: comparison of in situ measurements and numerical analyses. Géotechnique 53(3):301–315

    Article  Google Scholar 

  28. Hooper JA (1973) Observations on the behaviour of a piled-raft foundation on London clay. Inst Civ Eng 55:855–877

    Article  Google Scholar 

  29. de Sanctis L, Mandolini A (2006) Bearing capacity of piled rafts on soft clay soils. J Geotech Geoenviron Eng 132(12):1600–1610

    Article  Google Scholar 

  30. Lee J, Kim Y, Jeong S (2010) Three-dimensional analysis of bearing behavior of piled raft on soft clay. Comput Geotech 37:103–114

    Article  Google Scholar 

  31. Poulos HG (1991) Analysis of piled raft foundations. In: Beer et al (eds) Computer methods and advances in geomechanics. Balkema, Rotterdam, pp 183–191

    Google Scholar 

  32. Jeong S, Lee J, Lee C (2004) Slip effect at the pile-soil interface on dragload. Comput Geotech 31:115–126

    Article  Google Scholar 

  33. Poulos HG (1968) Analysis of the settlement of pile groups. Géotechnique 18:449–471

    Article  Google Scholar 

  34. Chow HSW (2007) Analysis of piled-raft foundations with piles of different lengths and diameters. Ph.D Thesis, University of sydney

  35. Reul O, Randolph MF (2004) Design strategies for piled rafts subjected to nonuniform vertical loading. J Geotech Geoenviron Eng 130(1):1–10

    Article  Google Scholar 

  36. Huang M, Liang F, Jiang J (2011) A simplified nonlinear analysis method for piled raft foundation in layered soils under vertical loading. Comput Geotech 38:875–882

    Article  Google Scholar 

  37. Horikoshi K, Randolph MF (1998) A contribution to the optimum design of piled rafts. Géotechnique 48(2):301–317

    Article  Google Scholar 

  38. Davis EH, TaylorH (1962) The movement of bridge approaches and abutments on soft foundation soils. In: 1st Biennial Conference Australian Road Research Board, p 740

  39. Kim KN, Lee SH, Kim KS, Chung CK, Kim MM, Lee HS (2001) Optimal pile arrangement for minimizing differential settlements in piled raft foundations. Comput Geotech 28:235–253

    Article  Google Scholar 

  40. Nguyen DD, Jo SB, Kim DS (2013) Design method of piled-raft foundations under vertical load considering interaction effects. Comput Geotech 47:16–27

    Article  Google Scholar 

  41. Randolph MF (1983) Design of piled raft foundations. In: Proceedings international symposium recent developments in laboratory and field tests and analysis of geotechnical problems, Bangkok, 6–9 December, pp 525–537

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Authors and Affiliations

  1. Department of Civil Engineering, Babol University of Technology, Babol, Iran

    A. Taghavi Ghalesari & P. Fardad Amini

  2. Department of Civil Engineering, Aalborg University, Sohngårdsholmsvej 57, 9000, Aalborg, Denmark

    A. Barari & L. B. Ibsen

Authors
  1. A. Taghavi Ghalesari
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  2. A. Barari
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  3. P. Fardad Amini
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  4. L. B. Ibsen
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Correspondence to A. Barari.

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Taghavi Ghalesari, A., Barari, A., Fardad Amini, P. et al. Development of optimum design from static response of pile–raft interaction. J Mar Sci Technol 20, 331–343 (2015). https://doi.org/10.1007/s00773-014-0286-x

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  • DOI: https://doi.org/10.1007/s00773-014-0286-x

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