Properties of clay subjected to secondary compression and cementation

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In order to investigate properties of clay subjected to secondary compression and cementation. The author have attempted to describe the undrained shear behavior of quasi-overconsolidated clay induced by secondary consolidation or cementation.Shear strength of undisturbed marine clays with various plasticity indexes were investigated. A series of triaxial compression test were performed on disturbed sample under various consolidation stresses in order to simulated both normally consolidated and overconsolidated situation in the field.Method for estimating the amount of increase in undraind shear strength of clay due to secondary compression is described. The proposed method is proved to be valid for estimating the increase in shear strength of a reconsolidated clay and an undisturbed clay in direct shear test and triaxial shear test. Further, in order to investigate on temperature effects of normally consolidated clay, consolidation tests and triaxial shear tests were carried out. It was clear that volume change of clay induced by heating is in proportion to increment of temperature change. From the above results, method for predicting yield stress of clay subjected to temperature effects were proposed.