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Obras y proyectos

versión On-line ISSN 0718-2813

Resumen

MENDOZA, Cristhian; FARIAS, Márcio  y  DA CUNHA, Renato P. Validation of advanced constitutive models for the mechanical behaviour of Brasilia's structured clay. Obras y Proyectos [online]. 2014, n.15, pp.52-70. ISSN 0718-2813.  http://dx.doi.org/10.4067/S0718-28132014000100005.

The majority of the classical constitutive models for soils does not take into account the influence of the soil 's structure and cementation. However, in the last decades these variables have been considered in various constitutive models to describe the mechanical behaviour of undisturbed soils. To include these variables it is necessary the development of structure laws able to model appropriately the material behaviour. In this paper, the behaviour of a structured and cemented clay from the city of Brasilia is analysed by means of triaxial tests and numerical simulations. To perform numerical simulations the models Cam Clay with structure, Subloading Cam Clay and Hypoplasticity with structure all of them combined with two structure laws, were chosen. The first two are based on elastoplasticity while the last one is based on hypoplasticity. As a result of the simulation process, advantages and drawbacks of each constitutive model were observed when compared with the test results. Finally, a discussion is presented in order to define the most appropriate model to simulate the mechanical behaviour of Brasilia 's clay.

Palabras clave : triaxial tests; elastoplastic model; hypoplastic model; Brasilia's structured clays.

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