Interpretation difficulties of pile set-up in sand

The compelling evidence for displacement pile set-up (i.e. capacity gains over time after installation) of shaft friction in sand has led to increasing attempts to incorporate time effects in design practice as well as in probabilistic analyses and numerical modelling. The progression is, however, b...

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Published inFrontiers in Offshore Geotechnics III : Proceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2015) Vol. 1; pp. 605 - 611
Main Authors Lim, J K, Lehane, B M
Format Conference Proceeding
LanguageEnglish
Published Leiden Taylor & Francis Books Ltd 01.01.2015
Subjects
Aging
Engineering
Field study
Field tests
Friction
Piles
Sand
Soils
Trends
Canada
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Summary:The compelling evidence for displacement pile set-up (i.e. capacity gains over time after installation) of shaft friction in sand has led to increasing attempts to incorporate time effects in design practice as well as in probabilistic analyses and numerical modelling. The progression is, however, based on a range of dubious inferences from case history data and trends that display a wide degree of scatter. The existing database of field tests indicates that the majority of the reported cases of set-up were assessed from dynamic load tests and static re-tests and, as a consequence, the interpreted degree of set-up differs from that of a virgin pile. In addition, these cases are usually characterised under the assumption that shaft friction increases vary with the logarithm of time. Recent research also reveals that the jacking procedures commonly employed in pile experiments (to model driven piles) lead to a different ageing behaviour to driven piles. Some of these difficulties are highlighted in this paper with the aim of reflecting current understanding of the phenomenon of pile set-up in sand.
ISBN:1138028487
9781138028487