Modelé et dégradation de route bitumée en milieu tropical humide (centre de la côte d’ivoire)

Résumé

The study of the sensitivity of human works to the characteristics of the landform is an interesting field of investigation in the options for the sustainability of infrastructures in humid tropical environments. The aim of this article is to show the contribution of the landform to the degradation of a tarred section of the A3 National Road in Côte d’Ivoire. The methodology is based on a multivariate analys is of the forms of road pathology according to the characteristics of the landform collected by field survey. The results show that the section was carried out on a landform consisting of 70% tabular plateaus and 30% ridges with more or less irregular summ its developed on granitoids. The summits of the landform are generally more spread out than the slopes and lowlands shaped in generally reworked ferrallitic soils with hardened facies. On this model, the 125 km asphalt section is affected by 670 degradatio n points in 09 forms of pathology, i.e. 65% of tears against 35% of deformation. These pathologies are correlated at 77% to the slopes of the plateaus with a pronounced accent on the tabular plateaus with a unclear and discontinuous cornice. Consequently, the slopes of the plateaus through their morpho -dynamic characteristics participate significantly in the degradation of asphalt roads. Thus, these segments of modeling deserve special attention in the construction of roads.