Authors: Allouche, Erez N.; Jaganathan, Arun P.

Source: Canadian Geotechnical Journal, Volume 45, Number 6, June 2008 , pp. 888-894(7)

Publisher: NRC Research Press

Abstract:

Heating of soil using microwaves has several applications in geosciences, including soil remediation, neutralization of land mines, and microwave-enhanced thermography. Numerical simulation of microwave-induced soil heating processes requires knowledge of the electrical properties of the soil as a function of temperature, moisture content, and frequency of the electromagnetic wave. This paper describes a semi-empirical model for calculating the dielectric properties of moist soils at various moisture contents, temperatures, and frequencies (within the band of 1-10GHz). The proposed model is an extension of the generalized refractive mixing dielectric model (GRMDM) for moist soils. Predictions of the proposed model were found to be in good agreement with experimental data reported in the literature. Results of a parametric study suggest that the temperature dependency of the dielectric properties of moist sand is more pronounced for higher volumetric moisture contents.

Le chauffage du sol au moyen de micro-ondes trouve plusieurs applications en géosciences incluant le comfortement du sol, la neutralization de mines terrestres et la bonification par micro-ondes de la thermographie. La simulation numérique des procédés de chauffage induit par micro-ondes requiert une connaissance des propriétés électriques du sol en fonction de la température, de la teneur en eau et de la fréquence de l'onde électromagnétique. Cet article décrit un modèle semi-empirique pour le calcul des propriétés diélectriques des sols humides à différentes teneurs en eau, températures et fréquences (à l'intérieur de la bande de 1 à 10GHz). Le modèle proposé est une extension du modèle généralisé de mélange réfractif pour les sols humides (« GRMDM »). On a trouvé que les prédictions du modèle proposé étaient en bonne concordance avec les données expérimentales rapportées dans la littérature. Les résultats d'une étude paramétrique suggèrent que la dépendance à la température des propriétés diélectriques du sable humide est plus prononcée pour des teneurs en eau volumétriques plus élevées.

Document Type: Research article

Publication date: 2008-06-01

More about this publication?

• Published since 1963, this monthly journal features articles, notes, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers, theoreticians, and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Papers on actual case records from practice are encouraged and frequently featured.
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