Microstructurally Related Model for Predicting Behavior of Unsaturated Soils with Double Porosity in Triaxial Space
Publication: International Journal of Geomechanics
Volume 22, Issue 12
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.
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Data Availability Statement
All data, models, or codes that support the findings of this paper are available from the corresponding author upon reasonable request.
Acknowledgments
This research was financially supported by the National Natural Science Foundation of China (U2034204, 52078031, U1834206), the Natural Science Foundation of Beijing Municipality (8202038), Fundamental Research Funds for the Central Universities (2021CZ109, 2021JBZ111), and the China Scholarship Council from the Ministry of Education of P.R. China (CSC202007090010).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 22 • Issue 12 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 16, 2021
Accepted: Jun 5, 2022
Published online: Sep 22, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 22, 2023
ASCE Technical Topics:
- Constitutive relations
- Engineering fundamentals
- Geomechanics
- Geotechnical engineering
- Hydraulic models
- Laboratory tests
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Mathematics
- Microstructure
- Model accuracy
- Models (by type)
- Porosity
- Soil mechanics
- Soil properties
- Soils (by type)
- Tests (by type)
- Triaxial tests
- Unsaturated soils
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