Relation Between Shrinkage Index And Swelling Pressure For Expansive Soil Found In Addis Ababa

This research is inspired by the PhD thesis work of H. B. Nagaraj from Indian Institute ofrnScience titled “Prediction of Engineering Properties of Fine Grained Soils from their IndexrnProperties”. The PhD thesis indicated that the swelling pressure has a poor correlation with thernliquid limit, a good correlation with the plasticity index and a better correlation with thernshrinkage index (liquid limit – shrinkage limit) of fine-grained soils. Nagaraj used a total set ofrnten remolded soil samples representing the three extreme clay mineral types namely Kaolinite,rnIllite and Montmorillonite. Also due attention was given to select pairs of soils with nearly thernsame liquid limit values, but having different plasticity properties. Consequently, the researchrntitle “Relationship between Shrinkage Index and Swelling pressure for expansive soil found inrnAddis Ababa” was selected for this Master’s thesis work.rnIn contrast to the PhD work mentioned above, the results of this Masters study show that thernrelationship between the swelling pressure and the shrinkage index for Addis Ababa expansivernclay (one type of soil) is very weak. However, a good approximation is obtained between thernnormalized shrinkage index (normalized by initial moisture content) and the swelling pressurernwith R2 value of 0.89. In addition to this, a better estimation is observed when multiple soilrnparameters are involved in different combination in prediction of the swelling pressure ratherrnthan only the shrinkage index. The correlations developed in this work are compared withrnpreviously established equations such as David and Komornik (1969), Nayak and Christensenrn(1974), Daniel Teklu (2004), Vijayvergiya and Ghazzaly (1973), where the first two equationsrnwere found to be in a better agreement with the correlations developed in this work.

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