Imperial College London
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ProfessorRichardJardine

Faculty of Engineering, Department of Civil and Environmental Engineering

Proconsul and Professor of Geomechanics
 
 
 
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Contact

 

+44 (0)20 7594 6083r.jardine CV

 
 
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Assistant

 

Ms Sue Feller +44 (0)20 7594 6077

 
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Location

 

532Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Buckley:2018:10.1139/cgj-2017-0145,
author = {Buckley, R and Jardine, R and Kontoe, S and Lehane, B},
doi = {10.1139/cgj-2017-0145},
journal = {Canadian Geotechnical Journal},
pages = {1577--1591},
title = {Effective stress regime around a jacked steel pile during installation, ageing and load testing in chalk},
url = {http://dx.doi.org/10.1139/cgj-2017-0145},
volume = {55},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper reports experiments with 102 mm diameter closed-ended instrumented Imperial College piles (ICPs) jacked into low- to medium-density chalk at a well-characterized UK test site. The “ICP” instruments allowed the effective stress regime surrounding the pile shaft to be tracked during pile installation, equalization periods of up to 2.5 months, and load testing under static tension and one-way axial cyclic loading. Installation resistances are shown to be dominated by the pile tip loads. Low installation shaft stresses and radial effective stresses were measured that correlated with local cone penetration test (CPT) tip resistances. Marked shaft total stress reductions and steep stress gradients are demonstrated in the vicinity of the pile tip. The local interface shaft effective stress paths developed during static and cyclic loading displayed trends that resemble those seen in comparable tests in sands. Shaft failure followed the Coulomb law and constrained interface dilation was apparent as the pile experienced drained loading to failure, although with a lesser degree of radial expansion than with sands. Radial effective stresses were also found to fall with time after installation, leading to reductions in shaft capacity as proven by subsequent static tension testing. The jacked, closed-ended, piles’ ageing trends contrast sharply with those found with open piles driven at the same site, indicating that ageing is affected by pile tip geometry and (or) installation method.
AU  - Buckley,R
AU  - Jardine,R
AU  - Kontoe,S
AU  - Lehane,B
DO  - 10.1139/cgj-2017-0145
EP  - 1591
PY  - 2018///
SN  - 0008-3674
SP  - 1577
TI  - Effective stress regime around a jacked steel pile during installation, ageing and load testing in chalk
T2  - Canadian Geotechnical Journal
UR  - http://dx.doi.org/10.1139/cgj-2017-0145
UR  - https://www.nrcresearchpress.com/doi/10.1139/cgj-2017-0145
UR  - http://hdl.handle.net/10044/1/55586
VL  - 55
ER  -
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