ANNEALABLE BEHAVIOUR OF SATURATED CLAY : AN EXPERIMENT AND SIMULATION

概要

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After complation of an undrained triaxial compression test to failure with a constant rate of axial strain, a clay specimen was continuously subjected to the same rate of axial strain but with a pore water supply from outside through top and bottom boundaries. The clay, then, exhibited a softening-like behaviour with swelling. A series of these triaxial experiments was next numerically simulated based on the soil-water coupled finite deformation computation using the original Cam-Clay constitutive model, in which a clear distinction was made between a triaxial soil specimen and soil elements in it. The simulation exhibited almost the same post-failure behaviour as that observed in experiment. Apparent softening behaviour of the clay specimen was demonstrated due to the behaviour of soil elements that traversed the critical state line. Annealable behaviour of clay was also shown possible with swelling after failure, in which the clay made a "comeback" from a current normally consolidated state to a former normally consolidated state. The stress path for which in a q : p' : v space was also illustrated.
社団法人地盤工学会の論文
1995-12-15