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• W2476447394 abstract "The objective of this work is to propose a new constitutive model for aggregated soils based on the evolution of pore size distribution along mechanical loading. A physical significance of the structure variable is given by the tracking of the pore size distribution along different compression states. The soil is considered as fully structured when it exhibits a fully developed bi-modal pore size distribution while this structure disappears when the pore size distribution shows a single mode of pore sizes [1]. From a constitutive point of view, this evolving microstructure is taken into account through the structure variable that tends to unity when the microstructure passes from bi-modal pore size distribution to a uni-modal distribution. This structure degradation is linked to the generation of volumetric and deviatoric plastic strain. Strictly speaking, the model is based on the ACMEG model developed for remoulded unsaturated soils [2] and extends it through the consideration of a structure variable. Irreversible strains are considered through two inter-connected plastic mechanisms. The isotropic mechanism is activated upon hydrostatic loadings while deviatoric mechanism is mobilised upon deviatoric stress states. The apparent preconsolidation pressure is the link between both mechanisms. In addition to the conventional strain hardening, the structure variable modifies the apparent preconsolidation. Finally, progressive mobilisation of plasticity can also be activated inside the bounding surface in order to control the smooth transition between elastic and plastic responses. This is particularly wellappropriated for soil with a dispersed structure. The proposed model follows the main concept of the models for structured soils as developed previously by various authors ([3], [4], [5], among others). The new ingredients are related to the double mechanism of plasticity that distinguishes structure degradation induced by deviatoric and isotropic loading. This model has been implemented in an implicit integration algorithm and is validated by comparison with experimental results (triaxial and oedometric compression tests) obtained on re-saturated soils compacted at different moisture contents (in order to generate different microstructures). Also, triaxial tests on heavily overconsolidated soils were carried out to highlight the deviatoric behaviour of isotropically-destructured soils." @default.
• W2476447394 created "2016-08-23" @default.
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• W2476447394 date "2015-01-01" @default.
• W2476447394 modified "2023-09-27" @default.
• W2476447394 title "A two-mechanism plasticity model for aggregated soils." @default.
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