Damage evaluation in pavement-geomaterial system using finite element-scaled accelerated pavement testing
Transportation Infrastructure Geotechnology
School of Engineering
In this article, finite element-scaled accelerated pavement testing (FEs-APT) has been conducted in a commercialised software package Abaqus. The stress response and rut depths have been estimated for the moving load over the full-scale accelerated pavement testing (Fs-APT) and finite element-scaled accelerated pavement testing test tracks. The outcomes of the developed numerical FEs-APT model have been examined and validated in light of results available in the literature on experimental pavement performance research. Based on equivalent and principal stress distributions, a novel insight has been analysed to estimate and understand the rutting process in the pavement. The displacement-stress response of the pavement has been observed for pavement, granular base course, and soil subgrade system subjected to a moving load. The stress and deflection responses along the pavement centre and edges for each cycle serve as the basis for the cyclic growth of rut deformation. It has been observed that the principal lateral stress at edges is compressive and tensile in nature and principal longitudinal stress along with shear stresses contributes towards permanent deformations. The shearing stresses support the rutting behaviour by producing a tensile action, and the shearing stresses in the orthogonal plane support the rutting behaviour by producing alternative compressive and tensile actions. It has been observed that the principal stress transfer mechanism for pavement-geomaterial systems subjected to moving load is one of the key parameters among deformation and equivalent stress on rutting behaviour and performance characteristics of pavement. The aforementioned observation concludes that displacement behaviour, equivalent stresses, and principal stress distribution explain the basis of rutting in pavement subjected to a moving load more realistically. Hence, this study can effectively be used by engineers and practitioners for estimating the life of the pavement-soil system while designing the pavements.