Modeling the stress-dilatancy relationship of unsaturated silica sand in triaxial compression tests

Fern, E, Robert, D and Soga, K 2016, 'Modeling the stress-dilatancy relationship of unsaturated silica sand in triaxial compression tests', Journal of Geotechnical and Geoenvironmental Engineering, vol. 142, no. 11, 04016055, pp. 1-15.


Document type: Journal Article
Collection: Journal Articles

Title Modeling the stress-dilatancy relationship of unsaturated silica sand in triaxial compression tests
Author(s) Fern, E
Robert, D
Soga, K
Year 2016
Journal name Journal of Geotechnical and Geoenvironmental Engineering
Volume number 142
Issue number 11
Article Number 04016055
Start page 1
End page 15
Total pages 15
Publisher American Society of Civil Engineers
Abstract It is well known that partial saturation increases the shear strength and dilatancy of unsaturated sand. However, little research has been carried out on the actual stress-dilatancy relationship. This paper shows that the increase in peak shear strength caused by partial saturation is consistent with an increase in dilatancy, and that conventional stress-dilatancy theories are still valid for unsaturated sand. The use of state indexes as a proxy for dilatancy were investigated and extended to unsaturated sands. Additionally, these indexes can be used to establish a critical state line that is based on material properties only. The validity of the stress-dilatancy theories and the use of state indexes offer simplicity in modeling the shear behavior of unsaturated sand. This will be demonstrated in this paper with the Nor-Sand model, with which the wetting collapse can be explained as a consequence of a loss of dilatancy characteristics.
Subject Civil Geotechnical Engineering
Keyword(s) Stress-dilatancy theory
Critical state theory
State indexes
Unsaturated sand
Constitutive modeling
DOI - identifier 10.1061/(ASCE)GT.1943-5606.0001546
Copyright notice © 2016 American Society of Civil Engineers
ISSN 1090-0241
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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