Engineering characterisation of Norwegian glaciomarine silt

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Title: Engineering characterisation of Norwegian glaciomarine silt
Authors: Long, Michael (Michael M.)Gudjonsson, GisliDonohue, ShaneHagberg, Knut
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Date: 9-Feb-2010
Online since: 2011-08-25T16:09:47Z
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.
Funding Details: 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.
Keywords: SiltCompressibilityShear strengthSamplingCPTU tests
Subject LCSH: Silt--Norway
Soil consolidation test
Shear strength of soils
DOI: 10.1016/j.enggeo.2009.11.002
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Language: en
Status of Item: Peer reviewed
ISSN: 0013-7952
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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