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

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Published in Transactions of the ASAE, v. 44, issue 5, p. 1047-1055.

© 2001 American Society of Agricultural Engineers

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The investigation reported in this article (00–05–30) is part of a study by the Kentucky Agricultural Experiment Station and is published with the approval of the Director.