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  5. Quality of conventional fixed piston samples of Norwegian soft clay
 
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Quality of conventional fixed piston samples of Norwegian soft clay

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Author(s)
Long, Michael (Michael M.) 
El Hadj, Nouri 
Hagberg, Knut 
Uri
http://hdl.handle.net/10197/3077
Date Issued
February 2009
Date Available
10T10:24:23Z August 2011
Abstract
It is well accepted that the quality of soft clay samples obtained using standard fixed piston samplers can be relatively poor and that block samples are necessary to yield very high quality samples. However for many practical projects it is not economically viable or physically practical to obtain block samples. In this project the quality of standard 54 mm composite piston samples of soft clay is examined by comparing six separate sets of 54 mm samples to parallel block sampling. Sampling and laboratory testing was carried out by three different organisations at a well characterised highly uniform soft clay site in Norway. As expected the work showed that the block samples behaved significantly differently from those obtained using the 54 mm sampler and were of higher quality. Block sample derived parameters were considerably different from those obtained from the 54 mm sample tests. However significant differences were also found between the different sets of 54 mm samples. Although the differences are less than when compared with block samples, the consequences of poor quality 54 mm sampling will be significant in engineering design. It is concluded that the differences are due to small details in the sampling operation such as the need to keep the piston effectively stationary at all times, to avoid overcoring and to handle the recovered sample carefully. If a well trained driller follows good quality practice, then relatively good samples can be obtained by the fixed piston sampler, which are suitable for analysis and design of routine engineering works.
Sponsorship
Not applicable
Type of Material
Journal Article
Publisher
ASCE
Journal
ASCE Journal of Geotechnical and Geoenvironmental Engineering
Volume
135
Issue
2
Start Page
185
End Page
198
Copyright (Published Version)
2009 ASCE
Keywords
  • Soil sampling

  • Soft clay

  • Quick clay

  • Cone penetration test...

  • Norway

Subject – LCSH
Soils--Sampling--Norway
Soils--Testing
Clay--Testing
DOI
10.1061/(ASCE)1090-0241(2009)135:2(185)
Web versions
http://dx.doi.org/10.1061/(ASCE)1090-0241(2009)135:2(185)
Language
English
Status of Item
Peer reviewed
ISSN
1090-0241 (print)
1943-5606 (online)
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-sa/1.0/
Owning collection
Civil Engineering Research Collection
Scopus© citations
19
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Feb 2, 2023
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