Compression behaviour of reconstituted soils at high initial water contents
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- 1 September 2010
- journal article
- Published by Emerald in Géotechnique
- Vol. 60 (9), 691-700
- https://doi.org/10.1680/geot.09.p.059
Abstract
Oedometer tests starting from a very small effective vertical stress of 0·5 kPa were performed on three reconstituted clays with different liquid limits. The soils were prepared at various initial water contents, ranging from 0·7 to 2·0 times their corresponding liquid limits. It is observed that the e–log σ ′ v compression curves show an inverse ‘S' shape due to suction pressure resisting deformation, similar to that of soft natural clays caused by consolidation yield stress. The suction pressure σ ′ s of the reconstituted clays can be correlated with the ratio of initial void ratio to void ratio at liquid limit e0/eL. The suction pressure curve defined by a unique relationship between suction pressure σ ′ s and the normalised void ratio at suction pressure es/eL is also proposed to distinguish between the pre-suction and the post-suction states. In addition, Burland's concept of the intrinsic compression line is adopted for correlating the compression curves of various reconstituted clays at high initia... On effectue des tests à l'oedomètre sur trois argiles reconstituées, avec différentes limites de liquide, en partant d'une très petite contrainte verticale utile égale à 0,5 kPa. On a préparé les sols avec différentes teneurs en eau initiales, allant de 0,7 à 2,0 fois leurs limites de liquide correspondantes. On relève que les courbes de compression e-log σ ′ v présentent une forme en « S » inversé, due à la résistance à la déformation de la pression d'aspiration, similaire à celle d'argiles naturelles tendres, causée par une limite élastique de consolidation. On peut mettre en corrélation la pression d'aspiration σ ′ s des argiles reconstituées avec le ratio indice de vide initial /indice de vide à la limite liquide e0/eL. La courbe de pression d'aspiration définie par un rapport unique entre la pression d'aspiration σ ′ s et l'indice de vide normalisé à la pression d'aspiration es/eL est également proposée, pour distinguer l'état pré-aspiration de l'état post-aspiration. En outre, on applique le concept...This publication has 29 references indexed in Scilit:
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