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Critical state model for structured soil

Journal of Rock Mechanics and Geotechnical Engineering 2020年第3期12卷 630-641页

作者： Cristhian Mendoza Marcio Muniz de Farias Department of Civil Engineering Universidad Nacional de Colombia Sede ManizalesManizalesColombia Department of Civil and Environmental Engineering University of BrasiliaBrasiliaDFBrazil

Structure is an evident determinant for macroscopic behaviors of ***,this is not taken into account in most constitutive models,as structure is a rather complex issue in *** this,it is important to develop and implement simple models that can reflect this important aspect of soil *** paper tried to model structured soils based on well-established concepts,such as critical state and *** state is the core of the classic Cam Clay *** sub-loading concept implies adoption of an inner(sub-loading)yield surface,according to specific hardening rules for some internal strain-like state *** and co-workers proposed such internal variables for controlling density(p)and structure(ω),using a modified stress space,called ***,similar variables are used in the context of the better-known invariants(p and q)of the Cam Clay *** change requires explicit adoption of a non-associated flow rule for the sub-loading *** is accomplished by modifying the dilatancy ratio of the Cam Clay model,as a function of the new internal *** modifications are described and implemented under three-dimensional(3D)*** model is then applied to simulating laboratory tests under different stress paths and the results are compared to experiments reported for different types of structured *** good agreements show the capacity and potential of the proposed model.

关键词： Elastoplasticity Cam clay with sub-loading structured soil Tropical soil Non-associated flow rule

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