Observations of shallow skirted foundations under transient and sustained uplift

Acosta-Martinez, H. E., Gourvenec, S. and Randolph, M. F. (2011) Observations of shallow skirted foundations under transient and sustained uplift. In Frontiers in Offshore Geotechnics II - Proceedings of the 2nd International Symposium on Frontiers in Offshore Geotechnics. pp. 397-402 .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper summarises results from a four-year experimental programme of centrifuge tests investigating installation resistance and uplift capacity of shallow skirted circular foundations in lightly over-consolidated clay. Centric and eccentric, monotonic, transient and sustained loading were investigated and the effect of gapping along the foundation-soil interface was explored. The results from this study showed that for a skirted foundation with embedment ratio d/D=0.3, reverse end bearing could be mobilised under transient uplift and loads of up to 50% of the undrained soil resistance could be sustained for months without significant displacement - provided nominal contact along the skirt-soil interface was maintained. The presence of gapping along the skirt-soil interface and eccentric loading reduced undrained capacity by up to 40%, and increased displacement rates under sustained uplift loading by up to a factor five.

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