不飽和締固め粘土の強度特性

概要

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Simplified effective stress law σ' = σ - ua is assumed where ua denotes pore air pressure. Pore air pressure in unsaturated clay being compacted is measured by using porous stones set up in the triaxial apparatus. If the degree of saturation is more than 90 %, c' and φ' are in accord with results of fully saturated clay. If the degree of saturation is less than 90 %, we should take capillary effect into consideration. The failure envelope of saturated clay intersects that of unsaturated clay at a point. The pore air pressure at the point amounts to the back pressure which is needed to get the degree of saturation of 90%. Taking advantage of the characteristics of the point, we can obtain approximate c' and φ' by correcting the failure envelope.
信州大学工学部の論文