期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 25, 期 8, 页码 1413-1435出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2008.11.009
关键词
Microstructures; Yield condition; Anisotropic material; Constitutive behaviour; Elastic-plastic material
资金
- Academy of Finland [210744]
- Marie Curie Research Training Network
- Laboratory of Soil Mechanics and Foundation Engineering of Helsinki University of Technology
- Academy of Finland (AKA) [210744, 210744] Funding Source: Academy of Finland (AKA)
This paper presents a micromechanical analysis of the macroscopic behaviour of natural clay. A microstructural stress-strain model for clayey material has been developed which considers clay as a collection of clusters. The deformation of a representative volume of the material is generated by mobilizing and compressing all the clusters along their contact planes. Numerical simulations of multistage drained triaxial stress paths on Otaniemi clay have been performed and compared the numerical results to the experimental ones in order to validate the modelling approach. Then, the numerical results obtained at the microscopic level were analysed in order to explain the induced anisotropy observed in the clay behaviour at the macroscopic level. The evolution of the state variables at each contact plane during loading can explain the changes in shape and position in the stress space of the yield surface at the macroscopic level, as well as the rotation of the axes of anisotropy of the material. (C) 2008 Elsevier Ltd. All rights reserved.
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