الفهرس 
2.2 Expansive Soil MineralogyOnly 14 pages are availabe for public view
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Abstract
Expansive soils are a widespread problem, causing substantial threats to civil engineering structures located in arid regions or dry-like areas of the temperate and equatorial climate. It shows a susceptible to shrinkage or swelling (heave) when its moisture content decreases or increases. Water content changes, the quantity and kind of clay-size particles in the soil, dry density, the magnitude of the surcharge pressure, and the amount of non-expansive materials are essential factors that influence the soil swelling/shrinking behavior. In the absence of sufficient experience to deal with volume change behavior of swelling soils, many defects may appear to any structure rested on expansive soils. Among the diverse treatment techniques, the using of expanded polystyrene (EPS) geofoam as a compressible inclusion is considered a simple, innovative solution for reducing the swelling pressures on the foundation that result from the expansive soil movements (heave/shrink). In the present study, the effectiveness of using EPS geofoam will be examined numerically for heave reduction of expansive soils. The results of two published cases study are used to verify the finite element simulation. Parametric analysis is conducted to assess the factors controlling the use of geofoam, including the geofoam density/stiffness, the diameter of the geofoam piles and the depth of the piles. Finally, The swelling behavior of El-Obour soil due to water infiltration is numerically studied. The impact of using EPS geofoam to reduce the soil movements in this clay is numerically highlighted.