VOLUME CHANGE BEHAVIOUR OF PARTLY SATURATED CLAYS DURING SOAKING AND THE ROLE OF EFFECTIVE STRESS CONCEPT

概要

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This paper deals with the one-dimensional volume change behaviour of kaolinite, montmorillonite and black cotton soil, when soaked in the partly saturated state. These clays were compacted in a partly saturated state to different densities with different initial moisture contents in oedometer rings loaded to different pressures ranging from 0.0625 to 8.0 tons/sq. ft and then soaked with distilled water at these pressures. Further, consolidation was then carried out on these soaked samples, in the conventional manner. The results were analysed in the light of the modified effective stress concept together with the physical mechanisms involved.The results obtained clearly indicate that the volume change behaviour of these clays during soaking is controlled basically by two mechanisms which are governed by the modified effective stress concept which takes into consideration the electrical attractive and repulsive forces at particle level. In Mechanism I, the volume change behaviour is controlled by the shearing resistance at interparticle level and in Mechanism II, by the long range electrical repulsive forces. Although these effects operate simultaneously, Mechanism I primarily controls non-expanding clays like kaolinite, and Mechanism II the expanding lattice type of clays like montmorillonite.
社団法人地盤工学会の論文
1973-09-15