TITLE:
Numerical Modeling of the Behaviour of a Road Structure on Compressible Soil: Case of the Road Section at the Beau-Rivage-Djassin Intersection
AUTHORS:
Yémalin Daniel Agossou, Judicael Agbelele, Peace Hounkpe, Daniel Djossou, Wilfried Hode, Edmond Adjovi
KEYWORDS:
MEF, Elastoplastic Behaviour, Modified Cam Clay, Mohr Coulomb, PLAXIS, ALIZE
JOURNAL NAME:
Open Journal of Civil Engineering,
Vol.13 No.2,
June
21,
2023
ABSTRACT: This document presents a study of the behaviour of a pavement structure
on compressible soil and the evaluation of its durability. The objective of
this study is to highlight the impact of taking into account the non-linear
elastic behaviour of soils and granular materials in the design process. To
this end, a numerical modelling of the pavement of the beau-rivage-Djassin
crossroads section in Porto-Novo was carried out, based on a compressible soil
whose behaviour will be considered elastoplastic. The subgrade soil on the
section is made up of several sub-layers.
The layer of soft, highly plastic clay was modelled according to a
modified Cam Clay behaviour, a model of swelling clay soils. The fine sand
layer and the granular layers of the structure are modelled according to
Mohr-Coulomb behaviour. The loading is considered to be uniformly distributed
according to the assumptions of the Burmister model in the French standard. A
first verification with ALIZE allowed to validate the structure on the basis of
the rutting deformation at the head of the platform εz = 359.6*10-6 which remains lower than the admissible deformation εz,adm = 360*10-6. The numerical calculation was
carried out using the finite element method, the code of which is implemented
under the PLAXIS v21 software. A comparative
study with the results of the ALIZE design revealed that the numerically
calculated strains εz = 585*10-6 are higher than those of ALIZE. These numerical strains,
which are higher than the elastic strains, do not meet the validation criteria
that the strains under loading must remain below the allowable strains. An
evaluation of the pavement durability was carried out and it was found that the
pavement would only last under traffic for 3 years before the first fatigue
deformations appeared.