Abstract
The stress generated by matric suction, or matric stress, was determined at points along the stress path with ananalytical and experimental procedure based on the modified Cam clay energy relationship. Matric stress was found to beapproximately constant at large strain for constant water content triaxial compression tests. Matric stress was included inboth shear and volume relationships in a criticalstate soil model that employed the modified Cam clay yield function. Shearwas modeled with a constant matric stress. Slope of the normal compression and recompression lines was adjusted for matricstress using a state function that expressed matric stress as a function of void ratio and degree of saturation. Predictionsgenerated by the model for deviator stress and axial, lateral, and volumetric strain showed satisfactory agreement with dataobtained from triaxial tests conducted on samples containing a range of void ratios and water contents.
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