Efeito da instalação de estacas helicoidais em solo tropical
Data
2017-11-15
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Biblioteca Digital de Teses e Dissertações da USP
Universidade de São Paulo
Escola de Engenharia de São Carlos
Universidade de São Paulo
Escola de Engenharia de São Carlos
Resumo
Descrição
Neste trabalho e avaliado o comportamento de estacas helicoidais instaladas em solo residual tropical, submetidas a esforços de tração. Para este fim, foram ensaiadas estacas helicoidais em dois campos experimentais distintos, um em Itirapina (SP), e outro em Betim (MG). No primeiro terreno, as hélices das estacas ficaram instaladas em solo residual não saturado, e no segundo terreno em solo residual saturado. Neste tipo de fundação, o efeito da instalação da estaca no solo acima das hélices e um dos fatores que afetam significantemente a capacidade de carga a tração da estaca. Portanto, considerando-se a modificação que ocorre na estrutura de solos residuais tropicais após serem penetrados pelas hélices da estaca durante a sua instalação no terreno, a presente pesquisa foi desenvolvida com o intuito de compreender o efeito desta desestruturação do solo no comportamento da estaca a tração. Para esta avaliação, foi realizado um programa experimental com provas de carga em estacas helicoidais (instrumentadas e não-instrumentadas) e ensaios de laboratório em amostras indeformadas do solo coletado ao redor de uma estaca instalada no terreno de Itirapina. Os resultados mostram o efeito significante da instalação na capacidade de carga a tração deste tipo de estaca, principalmente no caso de solo poroso e não saturado. Alem disso, por meio dos ensaios em estacas instrumentadas, foi verificado que este efeito e mais acentuado no solo acima das hélices superiores, que foi penetrado mais vezes durante a instalação.
In this work, it was evaluated the behavior of helical piles installed in tropical residual soil under tensile loads. For this purpose, helical piles of different configuration were tested in two different experimental sites, one in Itirapina (SP), and another in Betim (MG). In Itirapina, the pile helices were installed in unsaturated residual soil, and in Betim in saturated residual soil. For this type of foundation, the effect of pile installation on the soil above the helices is one of the factors that significantly affect the pile uplift capacity. Therefore, considering the changes that occur in the structure of tropical residual soils after being penetrated by the helices during pile installation, this research was conducted in order to understand the effect of this soil alteration on the uplift behavior of helical piles installed in this type of soil. For this evaluation, pile load tests were carried out on instrumented and non-instrumented helical piles. Also, laboratory tests were performed on undisturbed soil samples collected around a pile installed in the site of Itirapina. The results show the significant effect of pile installation on the uplift capacity of the tested helical piles, especially in the case of porous and unsaturated soil. In addition, through the tests on the instrumented piles, it has been found that this effect is more pronounced in the soil above the upper helices, which were penetrated more times during pile installation.
In this work, it was evaluated the behavior of helical piles installed in tropical residual soil under tensile loads. For this purpose, helical piles of different configuration were tested in two different experimental sites, one in Itirapina (SP), and another in Betim (MG). In Itirapina, the pile helices were installed in unsaturated residual soil, and in Betim in saturated residual soil. For this type of foundation, the effect of pile installation on the soil above the helices is one of the factors that significantly affect the pile uplift capacity. Therefore, considering the changes that occur in the structure of tropical residual soils after being penetrated by the helices during pile installation, this research was conducted in order to understand the effect of this soil alteration on the uplift behavior of helical piles installed in this type of soil. For this evaluation, pile load tests were carried out on instrumented and non-instrumented helical piles. Also, laboratory tests were performed on undisturbed soil samples collected around a pile installed in the site of Itirapina. The results show the significant effect of pile installation on the uplift capacity of the tested helical piles, especially in the case of porous and unsaturated soil. In addition, through the tests on the instrumented piles, it has been found that this effect is more pronounced in the soil above the upper helices, which were penetrated more times during pile installation.
Palavras-chave
Capacidade de carga a tração, Estaca helicoidal, Fundações profundas, Solos tropicais, Deep foundations, Helical piles, Tropical soils, Uplift capacity