A small-scale physical modelling program using particle image velocimetry and digital image correlation techniques was designed to obtain a refined understanding of the disturbance experienced by calcareous silt during tube sampling. The influence of the sampler wall thickness (diameter-to-thickness ratio, B/t) and the tube penetration rate were evaluated by estimating displacement and strain fields around the tube sampler. The results indicate that sampling with a thin tube leads to a relatively narrow undisturbed zone located at the centre of the tube, with a width slightly smaller than the tube radius. Opposite to what is suggested for soft clays, tube sampling tends to densify the calcareous silt. This aspect has an important influence on the assessment of sample quality in calcareous silt for offshore and onshore projects.
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September 2018
Research Article|
September 18 2018
Experimental assessment of sampling disturbance in calcareous silt Available to Purchase
G. T. Lim;
G. T. Lim
*Centre for Offshore Foundation Systems (COFS), The University of Western Australia, Crawley, Perth, Western Australia, Australia.
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J. A. Pineda;
J. A. Pineda
†ARC Centre of Excellence for Geotechnical Science and Engineering (CGSE), The University of Newcastle, University Drive, Building EA, Newcastle, Australia.
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N. Boukpeti;
N. Boukpeti
*Centre for Offshore Foundation Systems (COFS), The University of Western Australia, Crawley, Perth, Western Australia, Australia.
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A. Fourie;
A. Fourie
‡School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley, Perth, Western Australia, Australia.
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J. A. H. Carraro
J. A. H. Carraro
§Faculty of Engineering, Department of Civil and Environmental Engineering, Imperial College London (formerly at COFS), 528b, Skempton Building, London, UK.
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Publisher: Emerald Publishing
Received:
April 22 2018
Revision Received:
August 23 2018
Accepted:
August 23 2018
ICE Publishing: all rights reserved
2018
Geotechnique Letters (2018) 8 (3): 240–247.
Article history
Received:
April 22 2018
Revision Received:
August 23 2018
Accepted:
August 23 2018
Citation
Lim GT, Pineda JA, Boukpeti N, Fourie A, Carraro JAH (2018), "Experimental assessment of sampling disturbance in calcareous silt". Geotechnique Letters, Vol. 8 No. 3 pp. 240–247, doi: https://doi.org/10.1680/jgele.18.00068
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