Avaliação do fluxo de água em ferrovias com diferentes soluções para sublastro

Abstract

In the railway structure, among the functions of the sub-ballast layer are the protection of the platform soil, and the minimization of the fine aggregates’ pumping to the ballast layer. Concerning ways of improving these functions, one of the most prominent approaches is the incorporation of asphalt mixtures for total or partial replacement of the granular sub-ballast layer. In this work, asphalt mixtures for application in sub-ballast were designed and had their permeabilities evaluated for different values of volume of voids and compaction methods. From this, it was simulated the water flow in railway structures with the adoption of different solutions for the sub-ballast layer. It was verified that the prevention offered by the bituminous sub-ballast to the pumping of fines to the ballast represents an essential factor for the drainage efficiency of the railway structure