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Adaptive anisotropic constitutive modeling of natural clays

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Dejaloud, Hesam and Rezania, Mohammad (2021) Adaptive anisotropic constitutive modeling of natural clays. International Journal for Numerical and Analytical Methods in Geomechanics, 45 (12). pp. 1756-1790. doi:10.1002/nag.3223

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Official URL: http://dx.doi.org/10.1002/nag.3223

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Abstract

In this paper, an adaptive anisotropic constitutive model, namely AA1‐CLAY, is developed for clays based on the critical state framework. The model has a non‐associated flow rule, and it can also reduce to basic critical state constitutive models. A versatile yield surface (YS) is implemented in the model which can generate a broad range of shapes to improve the possibility of capturing experimental yield points of different clay types with high accuracy. In addition to the isotropic hardening rule, an innovative rotational hardening (RH) rule is also incorporated into the model to control the YS rotation rate. The proposed RH rule uses a transitional function to govern the effect of plastic strains at different constant stress ratios more realistically. Furthermore, the equilibrium state of anisotropy, which the YS tends to reach during plastic straining, is defined uniquely based on the experimental findings. The detailed model formulation is presented, and important features of the model are elaborately discussed. The capabilities of the model are also demonstrated by comparing the simulation results of several element tests on a number of different clays against the available experimental data.

Item Type: Journal Article
Subjects: Q Science > QE Geology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Clay, Anisotropy, Soil mechanics, Clay soils
Journal or Publication Title: International Journal for Numerical and Analytical Methods in Geomechanics
Publisher: John Wiley & Sons, Ltd.
ISSN: 0363-9061
Official Date: 25 August 2021
Dates:
DateEvent
25 August 2021Published
24 May 2021Available
20 April 2021Accepted
Volume: 45
Number: 12
Page Range: pp. 1756-1790
DOI: 10.1002/nag.3223
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDEuropean Commissionhttp://dx.doi.org/10.13039/501100000780

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