An Experimental Studyon Behaviourof Piled Raft Foundation

Jaymin D.Patil, Sandeep A. Vasanwala, Chandresh H. Solanki

Abstract


Piles in piled raft are often considered as settlement reducers, not load bearing members. Theexperimental study focuses on the behaviour of piled raft foundation subjected to vertical load. The model rafts were made of mild steel plateswith plan dimension 160 mm ×160 mm × 10 mm. The model piles used in this test were non-displacement piles of diameter 10 mm.Three lengths of piles were used in the experiment to represent slenderness ratio, L/D of 10, 15 and 20,respectively. The testing program includes tests on models of unpiled raft and rafts on 1, 4 and 9 piles. The influence of a number of piles and pile lengths on the load improvement ratio and foundation stiffness are presented and discussed. The results of the tests show that as the number of piles underneath the raft increases, load improvement ratio and foundation stiffness increases and percentage of load carried by the raft decreases.Theload improvement ratio and the foundation stiffness also increases with increase in pile length,while the pile length has a significant effect on the load carried by the raft.

 

Keywords: Raft,Piles,piled raft,model test


Full Text:

PDF

References


BurlandJB, Broms BB, de Mello VFB. Behavior of foundations and structures. Proc.9 ICSMFE; Tokyo: 2, 1977. 495–51p.

Poulos HG, Davis EH. Pile foundation analysis and design. New York: Wiley; 1980.

Clancy P., Randolph MF. An approximate analysis procedure for piled raft foundations. Int. J. Numer. Analyt. Meth. Geomech. 1993; 17(12):849–20p.

Randolph MF.Design methods for pile groups and piled rafts. Proc., 13th Int. Conf. on Soil Mechanics and Foundation Engineering; 1994; 5: 61–21p.

Horikoshi K., Randolph MF.Centrifuge modelling of piled raft foundation on clay. Geotech. 1996; 46(4): 741–11p.

Kim KN, Lee SH, Kim KS, et al. Optimal pile arrangement for minimizing differential settlements in piled raft foundations.Comput. Geotech. 2001; 28(4): 235–18p.

Cunha RP, Poulos HG, Small JC.Investigation of design alternatives for a piled raft case history. J. Geotech. Geoenviron.Eng. 2001;127(8):635–6p.

Cooke RW.Piled raft foundations on stiff clays:Contribution to design Philosophy. Geotech. 1986; 35(2):169–34p.

Horikoshi K., Matsumoto T., Hashizume Y, et al. Performance of piled raft foundations subjected to static horizontal loads. Int. J. Phy. Geotech. 2003; 3(2):37–13p.

Conte G., Mandolini A., Randolph MF.Centrifuge modelling to investigate the performance of piled Rafts. Proceedings of the 4th international Geotechnical seminar on deep foundations on bored and auger Piles; Van Impe. Rotterdam: W F Ed, Millpress;2003. 359–7p.

Lee SH, Chung CK.An experimental study of the interaction of vertical loaded pile groups in sand. J. CanadianGeotech. 2005; 42: 1485–8p.

BajadSP, SahuRB.An experimental study on the behaviour of vertically loaded piled raft on soft clay. The 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG);2008.84–6p.

Fioravante V., Giretti D., Jamiolkowski M. Physical modelling of raft on settlement reducing piles: From research to practice in Geotechnical Engineering. Reston; 2008. 206–39p.

Fioravante V., Giretti D. Contact versus Noncontact Piled Raft Foundations. J. Canadian Geotech. 2010; 47(11): 1271–16p.

El-Garhy B., Galil AA, Youssef AF, etal.Behavior of raft on settlement reducing piles: Experimental model study. J. Rock Mechanics Geotech. Eng. 2013:389–10p.

Horikoshi K, Randolph MF. Estimation of overall settlement of piled rafts: Soils and Foundations. 1999; 39(2). 59–9p.

ComodromosEM, Papadopoullou MC, RentzeperisIK. Pile Foundation Analysis and Design using Experimental Data and 3-D Numerical Analysis. Computers and Geotechnics. 2009; 36. 819–17p.

Rabiei M. Parametric Study for Piled Raft Foundations. J. Elec. Geotech. Eng. 2009;14:1–10p.




DOI: https://doi.org/10.37591/joge.v1i3.4037

Refbacks

  • There are currently no refbacks.