An Experimental Study of Creep Behavior for Disturbance of Unsaturated Expansive Clay Soil

Abstract

AbstractMost expansive clay soils are sensitive to the disturbance in their internal structure as a result of the extraction of samples because of the destruction in the natural soil structure. So a change in the properties of the expansive soil happens. The objective of this research is to conduct a laboratory study of the effect of the disturbance of expansive clay partially saturated soil samples on Secondary compression index \({ (}C_{a} )\) using the experimental method by conducting laboratory tests, i.e., (Oedometer experiment) of the soils in this research. In addition to that, the clay soil is material with permeability is very low and viscous and therefore, the water needs to be a long time to get out of the soil. This greatly affects the compression process and determines the beginning of the secondary consolidated settlement. Comparisons between simulations and experimental results showed that the behavior of the partially saturated expansive clay soil influenced by the method of forming the sample and is achieved through the relationship between vertical deformation and with logarithm of time, and is achieved during the secondary consolidated of the settlement, which increases linearly with the logarithm of time under constant pressure and slope of this line \({ (}C_{a} )\) at the time and method of sample formation.KeywordsExpansive soilUnsaturated soilSamples disturbanceOedometer testSecondary consolidation index