粘質土の降伏強度と土中水分エネルギの関係

概要

論文の詳細を見る
The mechanical strength of unsaturated soil in the water system depends on its capillary attraction force, while its adhesive force is said to be almost equal to the force of chemical potential in its capillary attraction. According to the centrifugal method, the chemical potential of water in soil is calculated by setting the sample subject to centrifugal force. This paper concerns the relation between the strength of cohesive clay and its interstitial force. The change in volume of a sample is found to be equal to that of water drainage by centrifuging. Therefore almost no capillary attraction is observable in centrifuged cohesive sample. The yield strength of the sample q_θ, which is drained by the centrifugal force, is recognized to relate to the chemical potential of water ⊿μ in the sample which is given in the following equation. ⊿μ= K・ q_θ where K is a fluctuation coefficient, ranging from 1 to 8. Consequently, it is suggested that the cohesive strength of clay does not depend exclusively on capillary potential, but on various other potentials including electric potential and van der Waals potential. The total potential of water in soil may be balanced with centrifugal force in process of irreversible drainage of water, and the yield strength of clay would be built by the total potential.
社団法人日本材料学会の論文
1971-05-15