Theoretical model to control on site the uplift capacity of helical screw piles embedded in sandy soil / Modelo teórico para controle da capacidade de carga à tração de estacas metálicas helicoidais em solo arenoso

AUTOR(ES)

Cristina de Hollanda Cavalcanti Tsuha

DATA DE PUBLICAÇÃO

2007

RESUMO

Empirical correlations between installation torque and uplift capacity of helical screw piles are routinely used as a procedure for quality control on site of this type of foundation. In this work, a theoretical model of the relationship between uplift capacity and installation torque of deep helical screw piles in sand was presented to be used as a quality control method for this type of foundation. An experimental program of laboratory and field investigations was carried out in order to validate this theoretical relationship. The field study included uplift tests of full-scale piles installed at the Escola de Engenharia de São Carlos (EESC) and in Contagem (Minas Gerais). The laboratory tests were performed in the Laboratoire Central des Ponts et Chaussées (LCPC/ Nantes) and at the EESC. In the LCPC a program of centrifuge and direct shear interface tests was completed. A set of torsion tests on pile shafts and of direct shear interface tests were carried out at the EESC. The results showed that the theoretical model presented is applicable to different pile dimensions, number of helices, and sand relative density. The methods existing in the literature for estimating uplift capacity of helical screw piles were used to verify the results of uplift capacities measured in field and in centrifuge studies. The results of centrifuge modelling tests demonstrated that the fraction of uplift capacity corresponding to the bottom helix increases with helix diameter and sand density. The torsion tests showed that the failure of the pile shaft begins at the same torque magnitude in experiments on shafts with and without connections.

ASSUNTO(S)

uplift capacity areia capacidade de carga à tração fundações profundas deep foundations controle durante execução estaca metálica helicoidal quality control on site modelagem física em centrífuga centrifuge physical modelling sand helical screw pile

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