Nouvelle méthode expérimentale pour déterminer le gonflement libre des sols argileux Novel experimental method to determine clay soil free swelling

Le dispositif est un interferometre de Michelson modifie. En effet sur le miroir mobile est colle un echantillon d’fargile cylindrique, seche, de longueur L, de rayon R et faconnee de maniere a retenir les gouttes d’feau a sa surface pour controler la teneur en eau. Lorsqu’fon injecte un volume d’feau distillee (quelques gouttes) a la surface de l’fechantillon, celui-ci se gonfle et le miroir se deplace. On observe le defilement des franges et on procede au comptage de leur nombre durant le temps t que dure le gonflement (environ 40 mn). On peut ainsi mesurer le deplacement libre du miroir et determiner: la valeur du gonflement exprime en % ou g/cm3, le gonflement sous contrainte σ (pour comparer avec l’foedometre) et sa vitesse au cours du temps t. <br> The propose device is based on Michelson interferometer. In fact, we put the a sample of cylindrical shape dry clay of length L and radius R on the mobile mirror, This sample can retain a drop of water on its surface in order to monitor water content. When injecting a volume of distilled water (a few drops) to the surface of the sample, it swells and moves the mirror. Consequently, we see scrolling fringes and we proceed to count their number during the time t during this swelling (about 40 min). We can measure the free displacement of the mirror and to establish the value of swelling expressed in% or g/cm3, the swelling under stress σ (to compare with the oedometer) and speed during a time t.

Abstract licence: CC BY

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