CUED Publications database

Uplift capacity of an under-reamed pile foundation

Harris, DE and Phani Madabhushi, GS (2015) Uplift capacity of an under-reamed pile foundation. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering, 168. pp. 526-538. ISSN 1353-2618

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Designing foundations to resist uplift forces is becoming of increasing concern, and is especially prevalent in the design of lightweight steel frame buildings or on sites with residual soils. However, little academic research has investigated under-reamed piles, instead focusing almost exclusively on anchor plates. In this paper, the effects of varying the under-ream angle on the uplift capacity and load–displacement curve form are investigated using 1g tests with full three-dimensional models in dry sand of varying densities. In addition, the failure mechanism geometry is investigated for various under-ream angles using half models coupled with particle image velocimetry methods. This paper also compares the results and observations with those predicted by a theoretical model in addition to the observations of other researchers. It is shown that variation of the under-ream angle has a differing impact on the foundations behaviour, which depends on the density of the sand surrounding the pile, and that this behaviour is explained by visualised changes in the failure mechanism geometry.

Item Type: Article
Uncontrolled Keywords: foundations geotechnical engineering piles & piling
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:05
Last Modified: 02 Sep 2021 04:16
DOI: 10.1680/jgeen.14.00154