Microstructurally related model for predicting behaviour of unsaturated soils with double porosity in triaxial space

Wu, Tianchi, Cai, Guoqing, Cleall, Peter ORCID: https://orcid.org/0000-0002-4005-5319 and Tripathy, Snehasis ORCID: https://orcid.org/0000-0003-1632-7668 2022. Microstructurally related model for predicting behaviour of unsaturated soils with double porosity in triaxial space. International Journal of Geomechanics 22 (12)

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Abstract

The microstructure can have an important impact on the hydraulic and mechanical behaviors of unsaturated soil; therefore, it must be considered in constitutive models to enable accurate predictions of soil behavior. This paper focused on the constitutive modeling of soils that exhibited a dual porosity structure. Based on the assumption that macro and micropores contained in the double porosity structure had different influences on the mechanical and hydraulic behaviors, the effective degree of saturation (Se) was selected as a microstructural index. This microstructural index was implemented within Bishop’s effective stress-based approach and the Glasgow coupled (GCM) and modified Cam-Clay models (MCC) were adopted as the basic framework for the development of a constitutive model. Typical samples of low expansive, nonexpansive, and collapsible soils with dual porosity were selected to validate the model’s performance, and the model performed well when compared with experimental data for isotropic compression, triaxial shear, and wetting tests.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	American Society of Civil Engineers
ISSN:	1532-3641
Date of First Compliant Deposit:	15 June 2022
Date of Acceptance:	5 June 2022
Last Modified:	01 Nov 2022 14:55
URI:	https://orca.cardiff.ac.uk/id/eprint/150424

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