Consolidation Coefficient and Swelling Potential for the Expansive Soils in Jordan


Emad Akawwi

Geotechnical Engineer, Natural Resources Authority, Amman, Jordan

Atef Al-Kharabsheh

Associate Professor, Al-Balqa’ Applied University, Al-Salt, Jordan


Large areas of Amman, the capital of Jordan, are covered with expansive clay soils, which derived mainly from marl, limestone and chert. The swelling and shrinkage potential of these soils caused by mineralogical constituents, and the surrounding environment, create serious problems to different types of construction. In order to determine the consolidation coefficients, swelling potential and Young’s modulus of these soils, the Odometer tests were performed. The Odometer tests showed that the swelling of soils ranged between 0.16% and 1.89% at natural water content, and between 0.34% and 0.94% at saturation. The consolidation coefficients ranges between 0.1-0.2 m2/year and 0.4-1.6 m2/year for the dry soil samples, and 0.2-0.4 m2/year for the wet soil samples. As well the soil suction was predicted from consolidation stress versus void ratio curve from three different ways. The first value was 166KPa, the second was 264KPa, and the third value was 87KPa. The average of these three values was taken as 169 KPa.

KEYWORDS: consolidation,swelling, void ratio, soil suction


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