Efeito da qualidade de amostras de argilas moles na previsão de recalques

Abstract

The project aims to estimate and confront the values of primary, secondary and total settlement. The values were obtained by the application of equations and the utilization of parameters of compressibility of different samples, which were extracted from a place located in the west zone of Rio de Janeiro. In the estimation of the settlement, the embankment was considered of being at 3 meters, the water was located in the ground level, and the effect of the embankment’s submergence was also contemplated. The samples are in different levels of perturbation, and they are divided in: undisturbed, disturbed, and corrected. The densification test was realized in all samples in order to obtain the necessarily parameters to preview the settlement. The undisturbed tests were made by the COPPE’s Geotechnical Laboratory – UFRJ, while the tests in the disturbed samples were made in the UNIPAMPA’s Geotechnical and Paving Laboratory. It was utilized the Lunne et. al. (2002) and Coutinho (2007) methods to classify the analyzed samples. The method to correct the quality of the samples proposed by Coutinho (2007) was applied in this project. This method utilizes logarithmic graphics to correct the pre-consolidation tensions and the recompression coefficient of the samples. From the total settlement’s analyzes, it was possible to affirm that the quality directly influences in the settlement’s prevision, and that the larger the deformation of the samples, the greater the estimated settlement magnitude.