Modeling the Stress-Dilatancy Relationship of Unsaturated Silica Sand in Triaxial Compression Tests
| Autor: | Kenichi Soga, Elliot James Fern, Dilan Robert |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Dilatant
021110 strategic defence & security studies 0211 other engineering and technologies 02 engineering and technology Geotechnical Engineering and Engineering Geology Partial saturation Shear (geology) Geotechnical engineering Wetting Material properties Triaxial compression Geology 021101 geological & geomatics engineering General Environmental Science |
| Zdroj: | Journal of Geotechnical and Environmental Engineering |
| ISSN: | 1943-5606 1090-0241 |
| DOI: | 10.1061/(asce)gt.1943-5606.0001546 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|