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

@inproceedings{Chan:2019:e3sconf/20199213009,
author = {Chan, DLH and Buckley, RM and Liu, T and Jardine, RJ},
doi = {e3sconf/20199213009},
pages = {1--6},
publisher = {EDP Sciences},
title = {Laboratory investigation of interface shearing in chalk},
url = {http://dx.doi.org/10.1051/e3sconf/20199213009},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - <jats:p>Chalk, a soft fine-grained Cretaceous limestone, is encountered across northern Europe where recent offshore windfarm, oil, gas and onshore developments have called for better foundation design methods, particularly for driven piles whose shaft capacities are controlled by an effective stress Coulomb interface failure criterion. Interface type and roughness is known to affect both interface friction angles, δ′ and the magnitude of dilation required for shaft failure to develop. Site-specific interface ring-shear tests are recommended for offshore pile design in sands and clays to account for driven pile shaft materials, roughnesses and shear displacements. However, few such tests have been reported for chalks and it is also unclear whether δ′ angle changes contribute to the striking axial capacity increases, or set-up, noted over time with piles driven in chalk. This paper describes an interface shear study on low-to-medium density chalk from the St. Nicholas-at-Wade research test site in Kent, UK, where extensive field driven pile studies have been conducted [1, 2]. Direct shear and Bishop ring shear apparatus were employed to investigate the influences of interface material and surface roughness, as well as ageing under constant normal effective stresses (σn'). It is shown that the high relative roughness of the interface compared to the chalk grain size results in the ultimate interface shearing angles falling close to the chalk-chalk shearing resistance angles. The δ′ angles also increased by up to 5° over 38 days of ageing.</jats:p>
AU  - Chan,DLH
AU  - Buckley,RM
AU  - Liu,T
AU  - Jardine,RJ
DO  - e3sconf/20199213009
EP  - 6
PB  - EDP Sciences
PY  - 2019///
SP  - 1
TI  - Laboratory investigation of interface shearing in chalk
UR  - http://dx.doi.org/10.1051/e3sconf/20199213009
UR  - https://www.e3s-conferences.org/articles/e3sconf/abs/2019/18/e3sconf_isg2019_13009/e3sconf_isg2019_13009.html
UR  - http://hdl.handle.net/10044/1/75573
ER  -
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