Volumetric strains due to changes in suction or stress of an expansive bentonite/silt mixture treated with lime [Déformations volumiques dues aux variations de succion ou de contrainte d'un mélange bentonite-limon traité à la chaux]

摘要

To further our knowledge of the coupling between the hydraulic cycles and mechanical behavior of treated swelling soils, this Note presents an experimental study on a bentonite/silt mixture treated with lime using a suction controlled osmotic oedometer. Successive wetting and drying cycles were applied at different suction ranges between 0 and 8 MPa, followed by a loading/unloading cycle at different suctions (2, 4 and 8 MPa). The compression curves of the aforementioned suctions provide the necessary information to analyze the influence of hydraulic cycles on the hydromechanical parameters of the treated swelling soils, such as the apparent preconsolidation stress P0(s), the virgin compression index λ(s) and the unloading elastic index value κ. The suction ranges as well as the number of suction cycles influence the mechanical parameters of the treated swelling soil greatly.