Metodologia de retroanálise de módulos de resiliência em camadas de pavimentos flexíveis: desenvolvimento do programa Retropav.

Abstract

The work in this study was to study the processes involved in backanalysis of the resilient modulus of the constituent layers of the pavement, with the goal of developing a different methodology of backanalysis and implement it in a program, the RETROPAV, accurate and easy to use. In preparing the program several assumptions have been followed, of which highlights the use of program analysis stress-strain of elastic layers ELSYM5 for the calculation of deflections, a program based on the theory of elastic, which features the pavement like a half-space elastic, composed of multilayer considered isotropic, homogeneous and perfect grip. The routine for obtaining the module employs the technique of adjusting measures to deflections calculated using an iterative process until the function obtained by summing the relative errors between measured and calculated deflection reaches a minimum value. Study was conducted using databases provided by Nobrega (2003) and Cavalcante (2005), which enabled to carry out a comparison between the results reported by RETROPAV to several other programs of backanalysis, as REPAVE, REPAV2V, RETROANA, RETRAN5-L, EVERCALC5 and ELMOD. The technique of obtaining modules from the fit between basins does not guarantee uniqueness for the solution, we can get various combinations of module for the same basin of deflections analyzed. This aspect is studied, demonstrating that the main parameter for obtaining good modules is the engineer officer in the process of backanalysis, based on his experience and knowledge, of the limits and criteria for backanalysis methods used but also the behavior of materials, validated his studies by other researchers or verified in laboratory studies.