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The constitutive modelling of London Clay

Yeow, HC; Coop, MR; (2017) The constitutive modelling of London Clay. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering , 170 (1) pp. 3-15. 10.1680/jgeen.15.00146. Green open access

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Abstract

Advances in understanding real soil behaviour, achieved over the past twenty years, and subsequent developments of relevant soil constitutive models, have greatly enhanced the predictive ability of numerical analyses of geotechnical structures. Of particular relevance, especially for serviceability limit state (SLS) design, has been the understanding of soils' small strain behaviour. For the behaviour of London Clay, initially developed models were simple curve-fitting techniques that reproduce stiffness dependence on stress and strain level, which has shown some successes in predicting SLS behaviours. Modelling failure of London Clay is significantly more complex due to its overconsolidated and fissured nature. More recent developments in soil constitutive modelling have therefore tried to encompass most important aspects of clay behaviour within the unified framework of critical state. However, even these advanced models have insufficient features to simulate the behaviour of overconsolidated clays. In this paper, a study has been made, comparing high quality laboratory triaxial data on London Clay with the predictions of two constitutive models, highlighting these deficiencies. It is shown how relatively simple modifications of advanced models, to capture the anisotropy of small strain stiffness and to impose a strength curtailment to represent strain localisation, can significantly improve the predictions of laboratory experiments.

Type: Article
Title: The constitutive modelling of London Clay
Open access status: An open access version is available from UCL Discovery
DOI: 10.1680/jgeen.15.00146
Publisher version: http://dx.doi.org/10.1680/jgeen.15.00146
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Geotechnical engineering, mathematical modelling, strength & testing of materials
UCL classification: 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/1522303
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