Comparação do recalque avaliado através de tomografia computadorizada e medido em prova de carga realizada em solo poroso, estruturado, não saturado.

Abstract

The main purpose of this work is to study the distribution of settlements down along soil profile, after a plate load test. The measured settlements were compared with predictions made by traditional methods. The settlements also were measured, indirectly, by means of computerised tomography. This measurement was done every 5cm under the plate test level. This work was carried out at Campo Novo do Parecis, MT The material in this area there is a porous, non saturated, structured, collapsible soil classified as ML. To pedologists this soils is classified as Redish Oxissols. SPT performed in this place showed values of NSPT ranging from 1-15. The upper layer (5 m) has an average value of 2. The use of computerised tomography allowed the estimation of settlement by a mathematical arrangement through void ratio and dry unit weight. The distribution of unit weight before and after plate load test is clearly different. The unit weight differences are concentrated on earlier depths being in accordance with waited results. The predictions of settlements were done by elastic theory, Schmertmann and Costet & Sanglerat empirical methods. Results shows that the empirical methods like Schmertmann have presented a good agreement between measured and predicted values of settlement. On the other hand, the prediction of soil deformation distribution under the plate made by Schmertmann (1978) method and the estimated values are quite different.