Comparação do desempenho de estaca hélice contínua com ponta em solo de baixa resistência e alta resistência

Abstract

Foundation Engineering is an area based on analysis, practice and caution for decision making and solutions to the problems that arise (ANDRADE, 2003). Foundations are essential because they are a structural element characterized by the function of distributing loads on the ground so as not to cause damage to the structure of the building to be built, to the land, and to the surrounding buildings. The carrying capacity calculations, as well as the prediction of depth of the foundation elements, require the exploration of the subsoil for the knowledge of the form, composition and infrastructure of the soil layers, thus, the investigation was carried out using the Standard Penetration Test (SPT). The objective of the present work is to carry out a comparative analysis of the performance of continuous helix piles with tips supported on low resistance soils, with Nspt around 4, and high resistance, with Nspt around 30, in a land located close to the edge. sea, in the city of Maceió-AL. Using the methods of Décourt and Quaresma (1978), Antunes and Cabral (1996) and Load Test made it possible to compare the behavior of the cuttings. It was possible to verify with the semi-empirical method of Décourt and Quaresma that the cutting edge strength has an influence of 35% for the long stake and 9% for the shorter stake. Through the load tests, it was observed that for the pile in soil with Nspt 4, there was a settlement of 45% more than that with Nspt 30, but that both are considered adequate for piles of the continuous helix type. Thus, it is considered that, for pillars with less load, such as pillars on the periphery, piles supported on soil with less resistance become more qualified, especially taking into account the savings in material and labor.