Quality of conventional fixed piston samples of Norwegian soft clay

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Title: Quality of conventional fixed piston samples of Norwegian soft clay
Authors: Long, Michael (Michael M.)
El Hadj, Nouri
Hagberg, Knut
Permanent link: http://hdl.handle.net/10197/3077
Date: Feb-2009
Online since: 2011-08-10T10:24:23Z
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.
Funding Details: 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 samplingSoft clayQuick clayCone penetration testingNorway
Subject LCSH: Soils--Sampling--Norway
DOI: 10.1061/(ASCE)1090-0241(2009)135:2(185)
Other versions: http://dx.doi.org/10.1061/(ASCE)1090-0241(2009)135:2(185)
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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