Stress–strain–strain rate relation for the compressibility of sensitive natural clays

Abstract

Four types of oedometer tests (constant rate of strain tests, controlled gradient tests, multiple-stage loading tests and creep tests) were carried out on a variety of Champlain sea clays. Results obtained on five sites are used to demonstrate that the rheological behaviour of these clays is controlled by a unique stress-strain-strain rate relationship. This relationship can be simply described by two curves (σ-p′-ɛv and (σ′/σp′)-ɛv). The significance, the practical implications and the limitations of the model are also discussed. Quatre types d'essais oedométriques (a vitesse constante de déformation, à gradient contrôlé, à chargement en plusieurs étapes et avec fluage) ont été effectués sur diverses argiles marines Champlain. Les résultats obtenus sur cinq sites sont utilisés pour démontrer que le comportement rhéologique de ces argiles est régi par une relation unique contrainte-déformation/vitesse de déformation. Cette relation peut être décrite de façon très simple par deux courbes (σp-ɛv et (σv′/σp′)-ɛv). L'article analyse aussi la signification, les implications pratiques et les limitations du modèle.

Stress relaxation coefficient and formulation for soft soils

“…The stress relaxation was described directly by using the secondary compression coefficient C ae . However, this expression does not relate stress relaxation behaviour to either a relaxation coefficient or a constant rate-dependent parameter (Leroueil et al, 1985;Leroueil & Marques, 1996). While the prior works evolved towards a mathematical characterisation of relaxation behaviour, there is no unifying expression that ties together the three timedependent behaviours (i.e.…”

“…Graham et al, 1983;Leroueil et al, 1985;Sheahan et al, 1996;Kim & Leroueil, 2001;Karstunen & Yin, 2010;Yin et al, 2010b or creep tests (e.g. Yin & Graham, 1989;Kutter & Sathialingam, 1992;Sheahan, 1995;Vermeer & Neher, 1999;Yin et al, 2010a;Wang & Yin, 2013 are conducted to evaluate the timedependent properties of soils.…”

Strain Rate Effect on Long-Term Consolidation of Osaka Bay Clay

“…In this paper, in order to model the isotache concept, we use very simple equations proposed by Leroueil et al (1985). These are expressed by Eqs.…”

Review of Secondary Consolidation of Structured Soft Soil

“…On the other side, if we only recognize the low compressibility of natural soil under low stress level but neglect the significant compressibility when the stress is over the yield stress, the stiffness of natural soil would be overestimated, which may threaten the safety of the construction. Leroueil et al [1] pointed that the structure of soil is the expression of sedimentary, load experience. For this view, any soil at any state should be more or less structured.…”