Effect of Temperature on Soil Water Characteristic Curves

Pedram Roshani, Julio Á, ngel Infante Sedano

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: T3A - Soil Mechanics III

ABSTRACT: The purpose of this paper is to examine the effect of temperature on the soil-water characteristic curve (SWCC) of unsaturated soils. Physical processes such as water permeability, conductivity, and shear strength of unsaturated soils are a function of the SWCC. While the SWCC is generally assumed to be a unique relationship for a soil for all practical purposes, factors such as temperature and volume change can affect the SWCC and in turn alter the soil properties which are affected by it. The influence of temperature on the SWCC is examined using two commonly used SWCC fitting functions, namely van Genuchten (1980), and Fredlund & Xing (1994). A rational approach for estimating the parameters used in these models as a function of temperature is presented. This approach estimates the effects of temperature on the air entry value of the model by applying first principles and the theoretical relationship between capillary rise and temperature.

RÉSUMÉ: -saturés. Des processus physiques tels que la conductivité hydraulique, et la résistance au cisaillement sont fonction de la CRE. Bien que la CRE est généralement supposée unique pour un sol donné pour la plupart des applications, des facteurs tels que la température et le changement de volume peuvent avoir un effet sur celle-ci, en à leur tour affecter les nfluence de la température sur la CRE est ici examinée en utilisant deux modèles -à-dire le modèle de van Genuchten (1980), et Fredlund & Xing (1994). Une approche rationnelle est présentée pour estimer les paramètres de ces modèles en fonction de la température. fondamentaux décrivant la capillarité et la température.

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