Laboratory Measure of SWCC for a Poorly Graded Fine Sand
ERDC Vicksburg United States
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A laboratory testing program was undertaken to investigate the effects of soil fabrics and densities on the Soil Water Characteristic Curve SWCC of a poorly graded SP, fine-grained sand. The program also better developed the capability to assess soils remotely under both discrete and multivariable geotechnical, geological, and environmental conditions. The results initiate both a soils database to define a baseline behavior and a predictive model for changes in soil characteristics strength and behavior volumetric under varying meteorological conditions. The laboratory testing program reconstituted the fine-grained sand samples dry of optimum saturation. An energy-based samplepreparation method was then used to build samples comparable to in-situ soil fabrics. Four preparation reconstitution energies and three saturation levels generated soil fabrics within a band of possible densities limited by the soils mechanical properties. The Transient Release and Imbibition Method TRIM, the Fredlund device, and the filter paper method FPM were used to develop a statistically representative laboratory SWCC over the range of densities and soil fabrics. Testing results indicate that the Fredlund device and TRIM measure the SWCC independently of preparation energy and saturation, as the mean SWCC and the median, maximum, and minimum curves fall within the same range of values.
- Test Facilities, Equipment and Methods
- Soil Mechanics