Limonite – a weathered residual soil heterogeneous at all scales

Airey, D., Suchowerska, A. and Williams, D. (2012) Limonite – a weathered residual soil heterogeneous at all scales. Geotechnique Letters, 2 7-9: 119-122. doi:10.1680/geolett.12.00026

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Author Airey, D.
Suchowerska, A.
Williams, D.
Title Limonite – a weathered residual soil heterogeneous at all scales
Journal name Geotechnique Letters   Check publisher's open access policy
ISSN 2045-2543
Publication date 2012-09-03
Sub-type Article (original research)
DOI 10.1680/geolett.12.00026
Open Access Status File (Publisher version)
Volume 2
Issue 7-9
Start page 119
End page 122
Total pages 4
Place of publication London, United Kingdom
Publisher I C E Publishing
Collection year 2013
Language eng
Abstract Limonite is a residual soil produced by the decomposition of magnesium silicate (olivine) rocks in tropical environments. During weathering most of the original rock is leached away leaving only its iron content, which is precipitated out in the form of iron sesqui-oxides to create a soft and highly porous soil. The predominant mineral present in limonite is goethite, which forms acicular nanoparticles that agglomerate to produce a silty sand with porous particles. The void ratio varies from 2 to 6, with higher values being a consequence of structure-supported voids. An extensive set of laboratory tests have been performed on a limonite soil profile which extends 50 m to rock. These data show that there is no pattern to shear strength with depth, with the shear strength equally likely to be 50 or 200 kPa through much of the profile. It is argued that the shear strength parameters for failure mechanisms, having any significant length, should be based on average values. The letter presents scanning electron microscopy photographs showing the fundamental particles, the results of triaxial tests comparing natural and reconstituted behaviour which show the effects of microstructure on the meso-scale response, and field data to show site variability.
Keyword Residual soils
Laboratory tests
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 28 September 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
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Created: Wed, 19 Dec 2012, 10:23:31 EST by Julie Hunter on behalf of School of Civil Engineering