Effects of Matric Suction on Residual Strength and Deformation Characteristics under Low Confining Pressure
Publication: Unsaturated Soils 2006
Abstract
Shear strength characteristics of unsaturated soils under low confining pressure are important in order to analyze the mechanism of slope failures induced by rainfall. In this paper, we studied the results of unconfined compression test and constant water content compression test on silt specimen under low confining pressure performed in the past and examined the residual strength and deformation characteristics. The residual stress states of specimens having different degrees of saturation and matric suctions at failure show a unique relationship for the confining pressure when the suction stress is considered. This means that "suction stress" affects the residual strength considerably. It is also found that when the specimens have nearly the same initial void ratio and expanded in shear process, critical state lines parallel to the original one is expected. From these results, it is inferred that in some cases, the extended Cam clay models proposed need to be modified when they are applied for low confining stress state.
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© 2006 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Compression tests
- Continuum mechanics
- Deformation (mechanics)
- Engineering fundamentals
- Engineering mechanics
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Residual strength
- Shear strength
- Soil deformation
- Soil dynamics
- Soil mechanics
- Soil properties
- Soil strength
- Soil suction
- Soils (by type)
- Solid mechanics
- Strength of materials
- Structural mechanics
- Tests (by type)
- Unsaturated soils
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