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A study of the effects of weathering on soils derived from decomposed volcanic rocks

Coop, MR; Okewale, IA; (2017) A study of the effects of weathering on soils derived from decomposed volcanic rocks. Engineering Geology , 222 pp. 53-71. 10.1016/j.enggeo.2017.03.014. Green open access

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Abstract

A comprehensive investigation was made of the effects of weathering on the nature and mechanics of volcanic saprolites from Hong Kong. Few such studies have been conducted in volcanic weathered soils and the application of a critical state type of framework that accounts for the effects of structure, as has been used here, is especially novel. The investigation examined the effects of spatial variations of the effects of weathering both vertically as the weathering degree alters, and horizontally through comparing data from different sites. In addition to index tests, SEM and XRD, an extensive series of oedometer, triaxial and multi-directional bender elements tests was carried out, comparing the behaviour of samples from different locations and depths in both intact and reconstituted states. This meant that the changes to the intrinsic (reconstituted) behaviour could be traced throughout different degrees of weathering along with the effects of changing structure on the mechanical behaviour of the intact soils. The intrinsic properties changed in a manner that was broadly consistent with the increasing of fines content and plasticity due to weathering. The effects of meso-structure were small to medium in compression, and in shearing they were generally even less evident, both at small strains and failure. The degrees of anisotropy of stiffness for both intact and reconstituted samples were mostly quite small.

Type: Article
Title: A study of the effects of weathering on soils derived from decomposed volcanic rocks
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.enggeo.2017.03.014
Publisher version: http://doi.org/10.1016/j.enggeo.2017.03.014
Language: English
Additional information: Copyright © 2017 Elsevier Ltd. All rights reserved. This is an Open Access article made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Weathering; Geological structure; Critical state framework; Anisotropy
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1546206
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