Behaviour of Vertically Loaded Piled Raft

Jaymin Dattu Patil, Sandeep A Vasanwala, Chandresh H Solanki


In order to understand the load-settlement behaviour and load sharing of piled raft resting on sand soil, 1-g model tests were conducted.The parameter studied were the influence of pile spacing and number of piles. The testing program includes tests on models of unpiled raft and rafts on 4 and 9 piles. The model piles beneath the raft are non-displacement piles.The improvement in ultimate bearing capacity is represented by load improvement ratio, foundation stiffness and reduction in settlement is represented by settlement reduction ratio.The influence of pile spacing and number of piles on the load improvement ratio,foundation stiffness and settlement reduction ratio are presented and discussed.The results of this tests shows that as the pile spacing and number of piles increases, the load improvement ratio, foundation stiffness and settlement reduction ratio increases.


Cooke R.W. Piled raft foundations on stiff clays. A Contribution to design Philosophy. Geotechnique. 1986; 35(2): 169–203p.

Horikoshi K., Randolph M.F. Centrifuge modelling of piled raft foundation on clay. Geotechnique. 1996; 46(4): 741–52p.

Conte G., Mandolini A., Randolph M.F. Centrifuge modelling to investigate the performance of piled Rafts. Proceedings of the 4th International Geotechnical Seminar on Deep Foundations on Bored and Auger Piles; 2003; Van Impe, W F Ed, Millpress, Rotterdam. 2003. 359–66p.

Horikoshi K., Randolph M.F. 1999. Estimation of overall settlement of piled rafts. Soils and Foundations.1999; 39(2): 59–68p.

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

doi: 10.1061/40962(325)2

Giretti D. Modelling of piled raft foundations in sand. Ph.D. Thesis. University of Ferrara, Italy: 2010.

Katzenbach R., Arslan U., Moormann C. Piled raft foundation projects in Germany. In: Hemsley J.A., editor. Design Applications of Raft Foundations. Thomas Telford, London; 2000. 323–91p.

Katzenbach R., Schmitt A., Turek J. Assessing settlement of high-rise structures by 3D simulations. Computer-Aided Civil Infrastruct Eng. 2005; 20(3): 221–9p.


Poulos H.G. Piled raft foundations: design and applications. Geotechnique. 2001; 51(2): 95–113p.

Randolph M. F. Design methods for pile groups and piled rafts. Proceedings of 13th International Conference on Soil Mechanics and Foundation Engineering; 1994. Vol. 5. 61–82p.

Reul O., Randolph M.F. Design strategies for piled rafts subjected to non-uniform vertical loading. J.Geotech. Geoenviron. Eng., ASCE. 2004; 130(1): 1–13p.


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