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Engineering characterisation of Norwegian glaciomarine silt
Date Issued
09 February 2010
Date Available
25T16:09:47Z August 2011
Abstract
Guidance is provided for geotechnical engineers designing civil engineering
works in silty soils based on a detailed characterisation of a glaciomarine silt from Os in western Norway. It was found that these soils are susceptible to disturbance by good quality fixed piston tube sampling and care needs to be taken when using laboratory derived design
parameters, particularly for consolidation and shear strength properties. A technique for assessing sample disturbance using shear wave velocity and suction measurements proved
promising. Conventional techniques for determining soil strength from triaxial tests in silt are inappropriate due to the dilational nature of the material and more reliable and logical strength estimates can be made from a limiting strain criterion. Field vane data should be used with caution as measured strength, particularly remoulded values, may be high and it seems more reliable parameters can be derived from CPTU tests. One dimensional consolidation and
creep of these silts can be modelled successfully by the well-known Janbu formulation. The behaviour of the Os silts does not fit easily into classical soil mechanics and published
frameworks for soft soils. It seems the material is of “transitional” type and this work adds to the database of such soils which includes other natural silts and gap graded soils. For future work it is recommended that larger sample tubes (say 75 mm) with a very sharp cutting edge should be used in parallel with in situ CPTU testing.
Sponsorship
Not applicable
Type of Material
Journal Article
Publisher
Elsevier
Journal
Engineering Geology
Volume
110
Issue
3-4
Start Page
51
End Page
65
Copyright (Published Version)
2009 Elsevier B.V.
Subject – LCSH
Silt--Norway
Soil consolidation test
Shear strength of soils
Soils--Testing
Web versions
Language
English
Status of Item
Peer reviewed
ISSN
0013-7952
This item is made available under a Creative Commons License
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