Determination of Shrinkage Properties of Clayey Soils by the Image Analysis Technique
The present paper involves a study the shrinkage properties during the drying of two types of Tunisian clayey soils under different initials hydraulic conditions and stress histories. A method of measuring the volumetric shrinkage using the image analysis technique is presented. Two procedures of sample preparation are used: slurry and consolidated. The evolution of the height and Crack Intensity Factor of the slurry and consolidated samples permit to define the dryings phases experienced by each soil. The shrinkage curves of consolidated and slurry samples are determined. Drying of saturated soil follows the saturation line until air entry value, which is the limit between the saturated and unsaturated soil. The air entry value depend in soil condition. The stress histories can reduce the kinetics of shrinkage and decreases the void ratio.
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