Dimensionamento de pavimento flexível para a via de ligação entre a MG-050 e a MG-341 em Piumhi-MG

Abstract

This work presents a case study on the design of a flexible pavement for the connecting route between highways MG-050 and MG-341, in Piumhi-MG, Brazil. The main objective is to apply the empirical methodology of the National Department of Transport Infrastructure (DNIT) to determine a suitable pavement structure for the local traffic loads and material conditions. To this end, the method consisted of conducting a traffic study through classified volumetric counts to determine the 'N' number, and the normative characterization of the pavement layers (subgrade, sub-base, and base) by adopting the minimum support values (CBR) established by technical standards. The results indicated the need for a robust structure, composed of a 10 cm asphalt concrete surface course, a 15 cm base, and a 118 cm sub-base. This is a direct consequence of the combination of traffic classified as extremely heavy and a foundation with a very low bearing capacity. It is concluded that the DNIT methodology, when applied to severe boundary conditions, results in a structurally safe but costly solution, highlighting the importance of in-depth geotechnical investigations in final design projects to optimize layer thicknesses and construction costs.