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Consolidation Characteristics of Clays Considering the Aging Effect  

김영수 (경북대학교 토목공학과)
이상웅 (경북대학교 토목공학과)
김대만 (경북대학교 토목공학과)
현영환 (경북대학교 토목공학과)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.6, 2004 , pp. 109-118 More about this Journal
Abstract
The consolidation of clay occurs with time lag, and this kind of lag can be separated into plastic lag and hydraulic lag. In this study, CRS tests were performed to research the effect of original secondary consolidation of the clay with respect to the characteristics of consolidation. Test results showed that plastic time lag was one of the key factors to get the preconsolidation pressure, and suggested the formula of the Quasi-preconsolidation pressure obtained from the relationship between consolidation time lag and consolidation pressures. In addition though the characteristics of coefficient of consolidation show a wide range of values, after passing the double preconsolidation point, it showed the tendency to converge into the constant value. The coefficient of permeability in normally consolidated state is related to its void ratio, and the permeability variables, n and $C_1$ were determined by the test results using the equation suggested by Samarasinghe. et. al. And then the equation was compared with the Kozeny-Carman's equation. Because of delayed compression caused by consolidation time lag, aging effect could be also found in the relationship between coefficient of permeability and void ratio.
Keywords
Aging effect; CRS test; Quasi-preconsolidation; Secondary settlement;
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