Light structures, such as highways and railroads, built on expansive soils are prone to
damages from the swelling of their underlain soil layers. Considerable amount of research
has been conducted to characterize the swelling properties of expansive soils. Current swell
characterization models, however, are limited by lack of standardized tests. Electrical
methods are non-destructive, and are faster and less expensive than the traditional
geotechnical methods. Therefore, geo-electrical methods are attractive for defining soil …