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Numerical Study of the Interaction between a Reinforced Concrete Pile and Soil

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Document pages: 11 pages

Abstract: This paper proposes a numerical simulation of the mechanical behavior ofa reinforced concrete pile foundation under an axial load. In fact, thefoundation of a structure represents the essential structural part of it,because it ensures its bearing capacity. Among the types of foundation, deep foundation is the one for which from amechanical point of view, the justification takes into account the isolated orcombined effects of base resistance offered by the soil bed and lateralfriction at the soil-pile interface; the latter being the consequence of alarge contact surface with the surrounding soil; hence the need to study theinteraction between the soil and the pile in service, in order to highlight thecharacteristics of soil which influence the mechanical behavior of pile andtherefore the stability of the structure. In this study, thereinforced concrete pile is supposed to be elastic, and characterized by a young’s modulus (E)and a Poisson’s ratio (ν). The soil obeys to a Camclay model characterized by a cohesion (c),an initial voids ratio (e0), shearing resistance angle (φ) and a pre-consolidation pressure(P0). A joint model with a Mohr Coulomb behavior characterizes the soil-pile interface. The loading is carrying out byimposing a vertical monotonic displacement at the head of pile. The results in terms of stress anddisplacement show that the bearing capacity of the pile is influenced byvarious soils characteristics, it appears that the vertical stress and theforce mobilized at rupture increase when the initial pre consolidation pressure,the cohesion and the internal frictionangle of soil increase; and when the initial soil voids index decreases.

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