The paper describes and evaluates an incremental plasticity constitutive model for unsaturated, anisotropic, nonexpansive soils (CMUA). It is based on the modified Cam-Clay (MCC) model for saturated soils and enhances it by introducing anisotropy (via rotation of the MCC yield surface) and an unsaturated compressibility framework describing a double dependence of compressibility on suction and on the degree of saturation of macroporosity. As the anisotropic and unsaturated features can be activated independently, the model is downwards compatible with the MCC model. The CMUA model can simulate effectively: the dependence of compressibility on the level of developed anisotropy, uniqueness of critical state independent of the initial anisotropy, an evolving compressibility during constant suction compression, and a maximum of collapse. The model uses Bishop's average skeleton stress as its first constitutive variable, favouring its numerical implementation in commercial numerical analysis codes (eg, finite element codes) and a unified treatment of saturated and unsaturated material states.
|Number of pages||20|
|Journal||International Journal for Numerical and Analytical Methods in Geomechanics|
|Early online date||16 Dec 2019|
|Publication status||Published - 1 Mar 2020|
Bibliographical noteThis is the peer reviewed version of the following article: Sitarenios, P & Kavvadas, M 2020, 'A plasticity constitutive model for unsaturated, anisotropic, nonexpansive soils', International Journal for Numerical and Analytical Methods in Geomechanics, vol. 44, no. 4, pp. 435-454 which has been published in final form at https://dx.doi.org/10.1002/nag.3028 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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- Bishop stress
- constitutive model
- critical state plasticity
- soil anisotropy
- unsaturated soils
ASJC Scopus subject areas
- Computational Mechanics
- Materials Science(all)
- Geotechnical Engineering and Engineering Geology
- Mechanics of Materials