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Master's Dissertation
Document
Author
Full name
Nilton de Souza Campelo
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1994
Supervisor
Committee
Cintra, José Carlos Angelo (President)
Albiero, José Henrique
Massad, Faiçal
Title in Portuguese
Comportamento de estacas submetidas a esforços verticais de tração, em solo colapsível
Keywords in Portuguese
Estacas
Provas de carga
Solo colapsível
Tração
Abstract in Portuguese
Este trabalho aborda uma análise comparativa dos resultados obtidos em provas de carga à tração, com os diversos métodos de previsão de carga última de estacas tracionadas. Os ensaios foram realizados no campo experimental de fundações do Departamento de Geotecnia da USP/São Carlos, sobre estacas apiloadas, escavadas a trado helicoidal e do tipo Strauss, com diâmetros de 20 a 32 cm, e comprimentos de 6 e 9 m. Observou-se que os métodos que consideram a ruptura na interface solo-estaca são os que conduzem a resultados mais satisfatórios de previsão. Ademais, estudou-se a colapsibilidade da ligação solo-estaca, uma vez que as estacas analisadas têm seu fuste embutido em solo de estrutura comprovadamente colapsível. Para tanto, realizaram-se as provas de carga primeiramente com o solo em estado natural e, posteriormente, inundado por 48 h, na carga de trabalho. Constatou-se o colapso da ligação solo-estaca nas cinco estacas, sendo que em três delas - duas escavadas e uma apiloada -, o colapso deu-se na carga de trabalho, com tempos de inundação inferiores a 48 h; nas outras duas estacas, após 48 h de inundação, prossegui-se normalmente com os incrementos de carga, ocorrendo o colapso para 60 e 78% das cargas respectivas de ruptura.
Title in English
Behavior of piles submitted to axial tensile forces in collapsible soil
Keywords in English
Colapsible soil
Pile
Pile test
Tensile
Abstract in English
This dissertation deals with an analysis by comparison of results obtained with piles submitted to axial uplift foreces using several prediction methods of ultimate loads. The pile tests were performed in the Experimental Site of the Departament of Geotechnical Engineering of USP/São Carlos, on bored, hammed and Strauss pile types, with diameters varying from 0,20 to 0,32 m and 6 to 9 m long. It was observed that the methods that took into account the pile-soil interface failure yelded better results. Moreover, the pile-soil interface colapsibility was analyzed, once the shaft of the studied piles were embedded in soil whose structure are truly collapsible. For this, pile testings were performed both in the natural soil conditions and soaked during 48 h for working load. Collapse was observed in the pile-soil interface in five piles. For three of them (two of which were bored and one hammed) the failure took place with working loads under 48 h soaking time; in two others, the failure, occured after 48 h soaking time with loads equivalents to 60% and 78% of natural soil's ultimate loads, respectively.
 
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Publishing Date
2018-08-09
 
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