An elastoplastic-viscoplastic soil model for cyclic loading
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/184205
Tipus de documentText en actes de congrés
Data publicació2011
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
A mobile projection centre extension to an existing elastoplastic-viscoplastic soil model is presented in this work. In this formulation, the projection centre evolves according to the stress path experienced by the soil, approaching it during the loading process [1]. In this way, the elastic (within which the behaviour is elastic) and the viscous (within which the behaviour is non-viscous) nuclei, will move with the projection centre. These nuclei may have reduced dimensions and reproduce more realistically the inelastic and time dependent soil
response under a larger set of stress paths. The proposed formulation is based on the continuous plasticity model with a viscous mechanism proposed by Kaliakin and Dafalias [2, 3]. The observed occurrence of creep deformation in stiff clays at small levels of deviatoric stress was one of the motivations for this work. It is important to note that the majority of numerical and laboratory studies of the effect of strain rate on the behaviour of soils usually refers to normally consolidated soils, and, as already reported by Hashiguchi and Okayasu [4], further theoretical and experimental studies on the time dependent behaviour of overconsolidated soils are needed.
In order to validate the proposed formulation a cyclic undrained triaxial test with unloading and reloading stages with creep was performed on a sample of a stiff Lisbon clay. The test was simulated using the described soil model and the results of both compared. This formulation significantly improves the reproduction of viscous strains associated with unloading stress paths such as those occurring, for example, in excavation works.
CitacióMaranha, J. R.; Vieira, A. An elastoplastic-viscoplastic soil model for cyclic loading. A: COMPLAS XI. "COMPLAS XI : proceedings of the XI International Conference on Computational Plasticity : fundamentals and applications". CIMNE, 2011, p. 1201-1211.
ISBN978-84-89925-73-1
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