Undrained uplift capacity of single helical piles and helical pile groups
Undrained uplift capacity of single helical piles and helical pile groups
Recent studies have examined the use of single helical piles as anchors for offshore wind turbines and have identified problems related to the necessary upscaling of such piles to meet the high required uplift capacity. An alternative attractive foundation solution that has been proposed to overcome these problems is to use groups of helical piles instead of single piles. In this paper the uplift capacity of individual helices, helical piles and helical pile groups, in undrained clay, is examined using three-dimensional finite element analyses. The results are first validated through comparison with existing numerical and analytical solutions for circular plates. Subsequently, three-dimensional analyses are presented in which individual helices are loaded to failure and shape effects on the bearing capacity and on the associated failure mechanisms are investigated. The effect of factors such as helix-soil adhesion and helix pitch on the bearing capacity is also examined. Finally, helical pile group analyses are presented, in which four-pile and sixteen-pile group layouts with several axial pile spacings are considered.
Nikitas Stefopoulos; K. Georgiadis; Themistoklis Nikolaidis
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
9. Shallow and deep foundations
https://doi.org/10.53243/NUMGE2023-131
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