Chapter
Apr 26, 2012
Equivalent Effective Stress in Unsaturated Fine Sand
Publication: GeoFlorida 2010: Advances in Analysis, Modeling & Design
Abstract
Laboratory tests on unsaturated fine sand show that the equivalent effective stress (EES) in the sand is function of the water content. The EES is determined through direct tensile tests. Three intervals were identified for which the EES varies in different way. In the saturated-funicular state (high water contents) the EES increases as the water content is reduced. If the sand has a water content in the complete-pendular state (an intermediate interval) the EES tends to be constant. for air-water distribution in the partial-pendular state (low water contents) the sand presents lower EES as the water content is reduced, which is the opposite tendency for the interval of water contents in the saturated-funicular state. The EES is a fraction of the suction stress applied in the specimens. This article provides more evidence that there is an EES in unsaturated soils that may reflect the true effective stress in the soil.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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M.ASCE
Domeight Research Institute, Chino Hills, CA, 91709. E-mail: [email protected]
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