A two-phase model and related numerical tool for the design of soil structures reinforced by stiff linear inclusions |
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Authors: | G. Hassen P. de Buhan |
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Affiliation: | Laboratoire des Matériaux et Structures du Génie Civil (LCPC, ENPC, CNRS UMR 113), 6 et 8, av. B. Pascal, 77455 Marne-la-Vallée cedex 02, France |
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Abstract: | A two-phase macroscopic model is presented for ascertaining the overall linear elastic behaviour of a soil reinforced by stiff long inclusions, with a particular emphasis on the shear and flexural behaviour of the reinforcements. Based on a minimum principle for the potential energy of any two-phase system, expressed as a function of the kinematically admissible displacement and rotation fields, a finite element formulation is established, resulting in the elaboration of a numerical computer code devoted to the simulation of any reinforced soil structure under plane strain conditions. This finite element code is applied to the evaluation of the settlements experienced by a rigid raft foundation placed on top of a soil reinforced by a group of vertical piles, and subject to combined loading conditions. One of the important conclusions which may be drawn from such a quantitative analysis is that the shear and flexural behaviour of the reinforcing piles, as well as the way these piles are connected to the foundation, play a decisive role in the case of lateral loading. |
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Keywords: | Reinforced soils Stiff inclusions Shear and bending effects Multiphase model Finite element method Piled raft foundations |
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