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{Vinck:2022:10.1680/jgeot.21.00197,
author = {Vinck, K and Liu, T and Jardine, RJ and Kontoe, S and Ahmadi-Naghadeh, R and Buckley, RM and Byrne, BW and Lawrence, JA and McAdam, RA and Schranz, F},
doi = {10.1680/jgeot.21.00197},
journal = {Géotechnique},
title = {Advanced in-situ and laboratory characterisation of the ALPACA chalk research site},
url = {http://dx.doi.org/10.1680/jgeot.21.00197},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Low-to-medium density chalk at St Nicholas at Wade, UK, is characterised by intensive testing to inform the interpretation of axial and lateral tests on driven piles. The chalk de-structures when taken to large strains, especially under dynamic loading, leading to remarkably high pore pressures beneath penetrating CPT and driven pile tips, weak putty annuli around their shafts and degraded responses in full-displacement pressuremeter tests. Laboratory tests on carefully formed specimens explore the chalk's unstable structure and markedly time and rate-dependent mechanical behaviour. A clear hierarchy is found between profiles of peak strength with depth of Brazilian tension (BT), drained and undrained triaxial and direct simple shear (DSS) tests conducted from in-situ stress conditions. Highly instrumented triaxial tests reveal the chalk's unusual effective stress paths, markedly brittle failure behaviour from small strains and the effects of consolidating to higher than in-situ stresses. The chalk's mainly sub-vertical jointing and micro-fissuring leads to properties depending on specimen scale, with in-situ mass stiffnesses falling significantly below high-quality laboratory measurements and vertical Young's moduli exceeding horizontal stiffnesses. While compressive strength and stiffness appear relatively insensitive to effective stress levels, consolidation to higher pressures closes micro-fissures, increases stiffness and reduces anisotropy.
AU  - Vinck,K
AU  - Liu,T
AU  - Jardine,RJ
AU  - Kontoe,S
AU  - Ahmadi-Naghadeh,R
AU  - Buckley,RM
AU  - Byrne,BW
AU  - Lawrence,JA
AU  - McAdam,RA
AU  - Schranz,F
DO  - 10.1680/jgeot.21.00197
PY  - 2022///
SN  - 0016-8505
TI  - Advanced in-situ and laboratory characterisation of the ALPACA chalk research site
T2  - Géotechnique
UR  - http://dx.doi.org/10.1680/jgeot.21.00197
UR  - http://hdl.handle.net/10044/1/95527
ER  -
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