Ageing and cyclic behaviour of axially loaded piles driven in chalk

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Title: Ageing and cyclic behaviour of axially loaded piles driven in chalk
Author(s): Buckley, RM
Jardine, R
Kontoe, S
Parker, D
Schroeder, FC
Item Type: Journal Article
Abstract: This paper reports a programme of static and cyclic loading tests on seven open steel tubes driven in low to medium density chalk at a well c haracterised test site, describing their response to driving, ageing in situ and loading under both static and cyclic conditions. Back analysis of dynamic monitoring identifies the distributions of notably low shaft resistances that develop during installa tion, showing that these depend strongly on the relative pile tip depth (h/R). The shaft capacities available to ‘virgin’ piles are shown to increase markedly after driving, following a hyperbolic trend that led to a fivefold gain after 2 50 days. Pre - fail ed piles do not follow the same trend when re - tested. Pile exhumation confirmed that driving remoulded the chalk, creating a puttified zone around the shaft. Excess pore water pressure dissipation , which is likely to have been rapid during and after drivin g , led to markedly lower water contents close to the shaft. Axial cyclic testing conducted around 250 days after driving led to a range of responses, from manifesting stable behaviour over 1000 cycles to failing after low numbers of cycles after developing sharp losses of static capacity. The dependence of permanent displacement on the cyclic loading parameters is explored and characterised. The experiments provide the first systematic study of which the Authors a re aware into the effects of undisturbed ageing and cyclic loading on previously unfailed piles driven in chalk. Potential predictive tools may now be tested against the reported field measurements.
Publication Date: 18-Jan-2018
Date of Acceptance: 6-Apr-2017
URI: http://hdl.handle.net/10044/1/47927
DOI: https://dx.doi.org/10.1680/jgeot.17.P.012
ISSN: 1751-7656
Publisher: Thomas Telford (ICE Publishing)
Start Page: 146
End Page: 161
Journal / Book Title: Geotechnique
Volume: 68
Issue: 2
Copyright Statement: Copyright © ICE Publishing, all rights reserved.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Technology Strategy Board
Institution of Civil Engineers
The Royal Society
Funder's Grant Number: EP/C528484/1
101968
1603
NA160438
Keywords: Science & Technology
Technology
Engineering, Geological
Engineering
chalk
offshore engineering
piles & piling
time dependence
DISPLACEMENT PILES
SHAFT FRICTION
SOIL STIFFNESS
SAND
PENETRATION
TESTS
CAPACITY
FIELD
MODEL
TIME
0905 Civil Engineering
Geological & Geomatics Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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