Relationship between drying characteristic curve and water characteristic curve of Tottori Dune sand
2009
Kamiya, K.(Gifu Univ. (Japan)) | Inoue, M.
The water characteristic curve is important for evaluation of the seepage behavior of unsaturated soil. The objective of this research was to develop a simple method for estimating the water characteristic curve from the drying characteristic curve of a soil. The drying characteristic curve is represented by the relationship between volumetric water content and evaporation rate, and is measured by the laboratory evaporation test in which the unsaturated soil sample is dried under heat at a constant temperature. In this research, the Tottori Dune sand with an initial volumetric water content in the range of about 0.2 to about 0.4 cubic cm/cubic cm were dried at temperatures in the range of 80degC to 140degC in the laboratory. The drying characteristic curves were obtained in a short time within two hours. The residual volumetric water content of water characteristic curve was determined from the drying characteristic curve. The inverse solution of the two undetermined parameters and the saturated volumetric water content of van Genuchten's equation for expressing the water characteristic curve were applied to the drying characteristic curve data. The water characteristic curve in the drying process estimated by the van Genuchten's equation was in good agreement with the measured one.
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