PREDICTION OF CLAY BEHAVIOUR IN UNDRAINED AND PARTIALLY DRAINED CYCLIC TRIAXIAL TESTS

概要

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Results from undrained cyclic triaxial tests followed by drainage on a reconstituted marine clay with high plasticity have been formulated to model the generation and dissipation process of cyclic induced excess pore pressure in clay. Through the introduction of two stress parameters in the formulation related to the relative cyclic strength and position in the effective p'-q stress space a unique relationship was found between the peak stress ratio on the extension side and the double amplitude shear strain under undrained cyclic loading. The excess pore pressure model proposed using this unique relation between the two defined parameters was then combined with the theory of axisymmetrical consolidation with radial drainage to predict the behaviour of clay under partially drained cyclic loading. The results of analyzing the behaviour during partially drained conditions were compared with the observed values of pore pressures and shear strains in drained-cyclic triaxial tests. It is suggested from comparisons that the proposed model for cyclic-induced pore pressures and shear strains should provide a practical tool for evaluating the settlements and stability of clay under partially drained cyclic loading.
社団法人地盤工学会の論文
1992-12-15