Serviceability Performance Evaluation of Helical Piles under Uplift Loading

Mosquera, Zorany S.Z.; Tsuha, Cristina de Hollanda Cavalcanti; Beck, André Teófilo

doi:10.1061/(asce)cf.1943-5509.0000805

Cited by 14 publications

(1 citation statement)

References 20 publications

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“…The prediction of the uplift behavior of helical piles is very complex as determination of stress-strain parameters for the disturbed soil (by the installation process) to calculate pile displacement during pull-out loading is not an easy task [23]. Assessing the torque value during the installation is not an easy operation.…”

Section: Torque Modelsmentioning

confidence: 99%

Review of torque models for offshore helical piles

Spagnoli

Tsuha

2020

E3S Web Conf.

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Helical (or screw) piles, sometimes defined as anchors, are a piled system consisting of one or multiple helices welded along the shaft. Piles are installed by applying a torque to the shaft. The pile is rotated into the soil and the rate of advancement should be an amount equal to the pitch for each rotation in order to minimize the disturbance of the original soil. Torque is maybe the most important parameter to be assessed during pile installation. In fact, torque and uplift capacity are directly proportional. Generally, torque depends on the soil conditions and on the geometrical features of the pile. Torque increases with sand density, installation depth, friction angle of sand, pile shaft and helix diameters. The geometry of the pile has a strong influence on the torque, the larger the helix-to-shaft ratio is, the larger the torque will be. In offshore applications helical piles are being considered as a valid alternative. However, one of the issues is still related to the assessment of the installation torque values. Several torque models have been considered and critical evaluated. Some simple comparisons among selected torque models have been also done and discussed.

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Section: Torque Modelsmentioning

confidence: 99%