Simple Modeling of Stress-Strain Relation for Unsaturated Soil
Publication: Experimental and Applied Modeling of Unsaturated Soils
Abstract
Though stress-strain characteristics of unsaturated soils are complicated and rather different from those of saturated soils, it should be described properly by a constitutive model for soils because soil usually stays under an unsaturated condition in actual field. In the current study, a simple elastoplastic model for saturated soil is extended to one applicable to unsaturated soils. The proposed model is formulated using the Bishop's effective stress and the residual strength is, therefore, assumed to be constant. In the proposed model, the decrease (or increase) in the degree of saturation is linked with upward (or downward) movement of normally consolidated line in the compression plane of mean effective stress and void ratio, by which the typical volumetric and distortional behaviors of unsaturated soils are properly described. In addition, a simple method to extend classical water retention curves such as van Genuchten's equation to be able to incorporate the influences of suction histories and density is proposed and applied to the proposed model. In the present paper, the outline of the proposed model is explained and applicability of the model is discussed through typical results of simulations.
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© 2010 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Consolidated soils
- Constitutive relations
- Effective stress
- Engineering fundamentals
- Geomechanics
- Geotechnical engineering
- Mathematics
- Saturated soils
- Soft soils
- Soil mechanics
- Soil properties
- Soil stress
- Soils (by type)
- Stress (by type)
- Stress strain relations
- Structural analysis
- Structural engineering
- Unsaturated soils
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