Development of Interaction Factors Charts for Piled Raft Foundation

Authors: Abdelazim Makki Ibrahim, Esamaldeen Ali

Abstract:

This study aims at analysing the load settlement behavior and predict the bearing capacity of piled raft foundation a series of finite element models with different foundation configurations and stiffness were established. Numerical modeling is used to study the behavior of the piled raft foundation due to the complexity of piles, raft, and soil interaction and also due to the lack of reliable analytical method that can predict the behavior of the piled raft foundation system. Simple analytical models are developed to predict the average settlement and the load sharing between the piles and the raft in piled raft foundation system. A simple example to demonstrate the applications of these charts is included.

Keywords: Finite element, pile-raft foundation, method, PLAXIS software, settlement.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1112329

References:

[1] H.G. Poulos, Piled raft and compensated piled raft foundations for soft soil sites, Geotechnical Special Publications, No 129, ASCE, pp. 214 – 234.
[2] R. Katzenbach, G. Bachmann, H. Ramm, “Combined Pile Raft Foundation (CPRF): An appropriate solution for foundation of high-rise building” Sloak Journal of Civil Engineering (SJCE), 2005, pp. 19-29.
[3] J.B. Burland, B.B. Brons, V.F.B. Mello, “Behaviour of foundation and structures” Proc. 9th int conf. On Soil Mech. And Foundation Eng., Tokyo, vol. 2, pp. 495-546.
[4] W.G.K. Fleming, A.J. Randolph, and W.K.Elson, Piling engineering. Taylor & Francis Group, London, 1992.
[5] X. Chen, P. Qian, “Research on optimizing design of pile raft foundation in soft soil” Proc. Of third international conference on soft soil engineering, Lee et al (eds), 2006, pp. 181-183.
[6] R. Katzenbach, G. Bachmann, H. Ramm, “Combined Pile Raft Foundation(CPRF): an appropriate solution for foundation of high-rise building” Sloak Journal of Civil Engineering (SJCE), 2005, pp. 19-29.
[7] F. Badelow, H.G. Poulos, J.C. Small, and P. Moyes, “Economic foundation design for tall buildings” Proceedings of International Conference on Piling and Deep Foundation. Amsterdam, 31 May-2 June, 2006, pp. 200-209.
[8] Al-Mosawi, J. Mosa, Fattah, Y. Mohammed, Al-Zayadi, and A. O. Abbas, “Experimental Observation on the Behavior of a Pile Raft Foundation” Journal of Engineering., vol. 17 (4), 2011, pp. 807-828.
[9] M.F. Randloph, “Developments in the Design and Construction of Piles” Discussion in Proc. of Conf. on Recent, London: ICE, 1979, pp. 389–390.
[10] M. F. Randloph, C. P. Worth, “Analysis of deformation of vertically loaded piles” ASCE, vol. 104, No. GT12, 1978, pp. 1485-1488.
[11] S.F. Brown, Practical foundation engineering handbook. New York: McGraw-Hill, 1996.
[12] M.F. Randolph “Design methods for pile groups and piled rafts”, Proc. 13th Int. Conf. S.M. & Found. Eng., vol. 5, 1994, pp. 61-82.