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Constitutive analysis of the mechanical anisotropy of Opalinus Clay

Content Provider	Springer Nature Link
Author	Salager, Simon François, Bertrand Nuth, Mathieu Laloui, Lyesse
Copyright Year	2012
Abstract	This paper aims to analyse the anisotropic features of behaviour of Opalinus Clay using the theory of plastic multi-mechanisms. The results of triaxial tests conducted with different load levels and directions showed that the mechanical behaviour of this shale is cross-anisotropic. The stiffer samples are those in which the loading direction is parallel to the bedding plane. This indicates that the preconsolidation stress depends on the orientation of the load with respect to the fabric of Opalinus Clay. It is proposed to interpret the observed cross-anisotropy with an elastoplastic model based on four plastic strain mechanisms that may be successively mobilised depending on the loading direction. The predicted stress–strain responses vary according to the directions of the space as a result of the hardening process, depending on the number of plastic strain mechanisms that have been mobilised. The numerical predictions show overall good agreement with the experimental data in terms of deviatoric stress versus axial strain, demonstrating that multi-mechanism plasticity is a suitable constitutive tool for the interpretation of the mechanical anisotropy of this shale.
Starting Page	137
Ending Page	154
Page Count	18
File Format	PDF
ISSN	18611125
Journal	Acta Geotechnica
Volume Number	8
Issue Number	2
e-ISSN	18611133
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-09-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cross-anisotropy Opalinus Clay Plasticity Shale mechanical behaviour Triaxial tests Geoengineering, Foundations, Hydraulics Continuum Mechanics and Mechanics of Materials Geotechnical Engineering & Applied Earth Sciences Soil Science & Conservation Soft and Granular Matter, Complex Fluids and Microfluidics Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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