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Instability of Granular Soil Under Conventional Triaxial and Constant Stress Paths
The concept of bifurcation domain has emerged in the context of the study of the mechanical stability of soils, and more generally of geomaterials. This domain constitutes a zone in which the failure of a material is possible but conditioned by the application of a particular mechanical stress and the use of a well-chosen control mode. The definition of failure modes in the bifurcation domain is more general than that used in a classic elastoplastic formalism with hardening (reaching the plastic limit surface). This study aims to highlight the existence of the bifurcation domain characterized by the instability line defined in undrained triaxial test. The conditional failure of a granular sample was investigated with the use of triaxial tests either in strain or stress control modes in one hand, and by applying different incremental loads after a first phase of drained triaxial loading in the other hand. An emphasis was put in particular on constant deviatoric loading path with successive steps of creep phase before and after crossing the instability line defined by the conventional undrained compression tests.
Instability of Granular Soil Under Conventional Triaxial and Constant Stress Paths
The concept of bifurcation domain has emerged in the context of the study of the mechanical stability of soils, and more generally of geomaterials. This domain constitutes a zone in which the failure of a material is possible but conditioned by the application of a particular mechanical stress and the use of a well-chosen control mode. The definition of failure modes in the bifurcation domain is more general than that used in a classic elastoplastic formalism with hardening (reaching the plastic limit surface). This study aims to highlight the existence of the bifurcation domain characterized by the instability line defined in undrained triaxial test. The conditional failure of a granular sample was investigated with the use of triaxial tests either in strain or stress control modes in one hand, and by applying different incremental loads after a first phase of drained triaxial loading in the other hand. An emphasis was put in particular on constant deviatoric loading path with successive steps of creep phase before and after crossing the instability line defined by the conventional undrained compression tests.
Instability of Granular Soil Under Conventional Triaxial and Constant Stress Paths
Springer Ser.Geomech.,Geoengineer.
Pasternak, Elena (editor) / Dyskin, Arcady (editor) / Benahmed, N. (author) / Zuo, J. (author) / Wautier, A. (author)
International Workshop on Bifurcation and Degradation in Geomaterials ; 2022 ; perth, WA, Australia
Multiscale Processes of Instability, Deformation and Fracturing in Geomaterials ; Chapter: 9 ; 74-83
2022-12-13
10 pages
Article/Chapter (Book)
Electronic Resource
English
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