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Engineering characterisation of estuarine silts
Author(s)
Date Issued
2007-05
Date Available
2011-08-25T15:50:18Z
Abstract
Guidance is provided for geotechnical engineers designing civil engineering works in silty
soils. A detailed characterisation of two estuarine silt sites in Ireland is performed and the soil
properties are linked to their geological origin. It was found that these soils are susceptible to
densification by conventional and high quality fixed piston tube sampling and care needs to be
taken when using laboratory derived design parameters, particularly for consolidation and
shear strength properties. One dimensional consolidation and creep of these silts can be
modelled successfully by the well known Janbu formulation. Settlement predictions from
laboratory derived parameters match reasonably with measured data but tend to underestimate
primary consolidation, consistent with a sampling densification effect. Vane data should be
used with caution as measured strength values may be high and it seems more reliable
parameters can be derived from CPTU tests. 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.
Sponsorship
Not applicable
Type of Material
Journal Article
Publisher
Geological Society of London
Journal
Quarterly Journal of Engineering Geology and Hydrogeology
Volume
40
Issue
2
Start Page
147
End Page
161
Copyright (Published Version)
2007 Geological Society of London
Subject – LCSH
Silt--Testing
Soil consolidation test
Embankments
Web versions
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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