Abstract: Expansive soils are mainly composed of highly hydrophilic clay minerals such as montmorillonites and illites.  They have typical characterizations of expansive soils: high plasticity clay with typical expansive structures, fissures, strong swellcontraction and strength reduction with increase of moisture content. This paper presents the case history of the geotechnical investigation for a power transmission line project in Munga, Sudan. The engineering properties of the expansive soils in the region are evaluated and the methods for mitigating the hazards induced by the expansive soils are compared. The empirical correlations among the expansive soil properties and plastic index as well as liquid limits are established. The paper also evaluates the correlation between the expansion force and the initial moisture content. These results can provide guide lines for the foundation constructions in Munga region as well as the research of expansive soils in China.

Key words: Sudan, Munga Region, Expansive Soils, Engineering Properties, Hazard Minimization Measures