CHANGE IN STATE OF COHESIVE SOIL DURING SECONDARY COMPRESSION

Abstract

The quasi-overconsolidation characteristics of a so-called aged normally consolidated clay are considered from the viewpoint of change in state during the secondary compression, in order to explain the mechanism of variation in stress and strain under the condition of 1-D compression. Especially, it is shown that the difference of time-dependency between the dilatancy and the distortional creep discriminates the pattern of change in state, through a series of the drained creep test and the long-term consolidation test using kaolin. As an approximate approach for analyzing such behaviors peculiar to the cohesive soil, a three-dimensional dilatant visco-elastic model of clay is calculated quantitatively by means of Laplace transformation.