Behaviour of continuous flight auger piles in homometric and carbonated sands

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Publication Title
Behaviour of continuous flight auger piles in homometric and carbonated sands

Abstract
Continuous flight auger piles allow for a quick on-site installation, short execution time and a bearing capacity usually much higher than that of other bored piles. For these reasons, they are the most common piles in France, whether the encountered soils be fine or granular. However, homometric and carbonated sands are identified as ‘problematic’ for these kinds of piles, either in terms of execution or with regard to the bearing capacity, without the reasons being clearly stated in the scientific literature and technical documents. This communication presents the results of static loading tests carried out on three sites and on seven CFA piles in order to better understand the behaviour of these piles in this type of sands and to optimize their design. The geological and geotechnical context is first described in details. The implemented instrumentation and the obtained results are then presented. An analysis is then carried out, in the light of mechanical tests and further identification of the sandy soil, making it possible to understand the atypical behaviour of these piles in such soils, as well as to propose amended procedures for the design of continuous flight auger piles in these sands.
Authors
Fabien Szymkiewicz; Lamis Makki; Sonia Fanelli; Carlos Minatchy; F. Guirado; Julien Habert

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

A - New developments on structural design

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