Modelagem numérica do aterro suportado por colunas Deep Soil Mixing do aeroporto Salgado Filho - RS

Abstract

Reinforced piled embankment is an engineering technique that has been increasingly used as a solution for construction on soft soils. It consists basically by the installation of piles, on which one or more geosynthetics layers are placed, followed by the embankment construction. The structure presents advantages related to costs, deadline accomplishment and eliminating of the settlement, resulting in a stabilized and, in many cases, economically sustainable solution. The fact that there are no national standards for guiding the procedures for the structure implementation, added to the existence of different calculation methods, demonstrate the need of a better understanding about the stress and deformation mechanisms related to it. This research aims to study reinforced pile embankment through the analysis of a computational model, extracting the distribution of vertical stresses and the occurrence of settlement in the components of the structure. The study makes it possible to analyze the main design parameters and the performance of the materials used, contributing to obtain more adequate dimensions. The model is validated through a comparison between the modeling results and measurements from an instrumented reinforced piled embankment. The modeling was performed using the Abaqus / CAE software, which is based on the Finite Element Method (MEF). The model construction considered the the mechanical material properties, its interactions, as well as factors related to the execution. The results indicate good agreement between model, literature and instrumented work in terms of the vertical stresse.