Análise de estruturas de pavimentos flexíveis dimensionadas pelos métodos DNER e MeDiNa

Abstract

The objective of this work was to analyze flexible pavement structures designed by the empirical methods of the National Department of Roads and Rodagens (DNER) and the empirical-mechanistic National Dimensioning Method (MeDiNa). For the analysis, three distinct traffic levels were considered and parameters obtained from bibliographical research to obtain data that resemble the region of Campo Mourão, Paraná. The empirical design considers the traffic volume and the California Bearing Ratio (CBR) value of the layers that make up the pavement, while the empiricalmechanistic methodology considers the mechanical properties of the materials used, resulting in the evaluation of permanent deformation and cracks by fatigue. Once the dimensioned were carried out, they were followed by the MeDiNa software as structures transited by both methods. Note the difference between layer thicknesses for the same traffic and materials. The MeDiNa method revealed pavements with coating layers 50% to 100% thicker than the DNER method, which, in turn, presented structures more prone to the occurrence of fatigue cracks, reaching an estimate of 99% of cracked area and greater permanent deformations. The new method, still in the implementation phase, requires the analysis of materials and their properties through mechanical tests, highlighting the need for development and development of laboratories and professional technicians to carry them out.