Correlation of Placement Conditions and Soil Intrinsic Properties with Shear Strength of Cohesive Soils

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Zumrawi, Magdi M.E
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University of Khartoum
Shear strength of cohesive soils is great essential in determining the bearing capacity of foundations, slope stability of embankments, and lateral earth pressures on retaining structures. This study mainly deals with the factors affecting the shear strength of compacted cohesive soils. A comprehensive literature review relevant to the shear strength characteristics and influencing factors was presented. Intensive laboratory investigation was undertaken on two clay soils selected from different regions in Khartoum state. Unconfined compression tests were performed on soil samples compacted at a wide range of moisture content and varied dry densities to measure the shear strength. The results reveal that the placement conditions (moisture content and dry density) and the soil intrinsic properties (plasticity and liquidity indices) have significant effects on the shear strength measured values. These parameters of simple and easy measured soil index properties were combined in a factor; termed consistency factor. This factor shows a direct linear relationship with the shear strength for the soils tested. This relationship can be used in predicting the shear strength of compacted cohesive soils.
Cohesive; Placement conditions; Shear strength; Soil intrinsic