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Finite element simulations of the behavior of piled-raft foundations using a multiphase model

Abstract : SUMMARY: Finite element simulations of the behavior of a piled raft foundation have been carried out using a multiphase model conceived as an improved homogenization approach. According to this model, the ground reinforced by a group of piles is treated as a homogeneous continuous medium. In this approach, no specific interface elements are necessary to account for the mechanical interaction between the piles and the ground: this interaction is described by means of two scalar parameters, one stiffness parameter and one which can easily be derived from the maximum ground-pile friction. The implementation of the model into a finite element code provides an efficient tool for the analysis of the influence of the pile number or length on the settlement and bearing capacity of a square piled raft foundation and of the way the total applied load is shared between the raft and the piles. Results are compared with a standard 3D finite element analysis. The comparison highlights the fact that the proposed approach remains to be improved to account for tip resistance. © 2012 John Wiley and Sons, Ltd.
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Soumis le : jeudi 13 février 2014 - 14:03:19
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E. Bourgeois, G. Hassen, Patrick de Buhan. Finite element simulations of the behavior of piled-raft foundations using a multiphase model. International Journal for Numerical and Analytical Methods in Geomechanics, 2013, 37 (9), pp.1122-1139. ⟨10.1002/nag.2077⟩. ⟨hal-00946100⟩



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