Abstract
It is extremely important to evaluate the consolidation yield stress accurately in order to predict the settlement in the chohesive soils in which long-term large settlement due to a loading occurs in the neighborhood of the consolidation yield stress. Especially, in the soils where the compressibility is large after yielding, the influence of the decided consolidation yield stress value on the accuracy of settlement prediction of settlement is significant. Moreover, it is important to consider the strain rate dependency, because strain rate influences consolidation yield stress. In this study, various consolidation tests were carried out using clays of three areas (Osaka Bay, Amagasaki, Kyoto) with different consolidation history, and strain rate dependency of consolidation yield stress was studied in detail. As a result, it is shown that understanding of the strain rate dependency on the consolidation yield stress up to the level of ε=10-11 s-1 is very important for engineering.
