TITLE:
Numerical Study of the Interaction between a Reinforced Concrete Pile and Soil
AUTHORS:
N. M. Nde, D. Fokwa, M. Mbessa, T. T. Tamo, C. Pettang
KEYWORDS:
Pile, Soil, Interaction, Numerical Simulation, Pre_Consolidation Pressure, Voids Ratio, Cohesion, Internal Friction Angle
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.10 No.3,
September
11,
2020
ABSTRACT: This paper proposes a numerical simulation of the mechanical behavior of
a reinforced concrete pile foundation under an axial load. In fact, the
foundation 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 a
mechanical point of view, the justification takes into account the isolated or
combined effects of base resistance offered by the soil bed and lateral
friction at the soil-pile interface; the latter being the consequence of a
large contact surface with the surrounding soil; hence the need to study the
interaction between the soil and the pile in service, in order to highlight the
characteristics of soil which influence the mechanical behavior of pile and
therefore the stability of the structure. In this study, the
reinforced 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 by
imposing a vertical monotonic displacement at the head of pile. The results in terms of stress and
displacement show that the bearing capacity of the pile is influenced by
various soils characteristics, it appears that the vertical stress and the
force mobilized at rupture increase when the initial pre_consolidation pressure,
the cohesion and the internal friction
angle of soil increase; and when the initial soil voids index decreases.