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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2580

Authors: Ayenew, Zewdie
Advisors: Messele Haile, Dr.
Copyright: Nov-2004
Date Added: 4-May-2012
Publisher: AAU
Abstract: Considerable research work has been done on the shear strength properties of most soils. However, very little information is available on the shear strength characteristics of expansive clays. This is mainly due to the fact that many investigators have concentrated most of their efforts towards finding solutions to the swelling behavior associated with these clays. However, the strength behavior of expansive clays need not be overlooked. Factors such as swelling and shrinkage, for example, influence the soil strength significantly and their effects are difficult to account for in most laboratory shear tests. Furthermore a thorough knowledge of shear strength is required to estimate the bearing capacity of expansive clay soils and also to evaluate the stability of dams, road and railway embankments built in these soils areas. Therefore, in this paper, Unconsolidated Undrained triaxial shear strength tests were performed on unsaturated soil and on some saturated soil samples collected from different locations of Addis Ababa, unsaturated soil sample of Gambela and unsaturated soil sample of five major roads (i.e. Addis-Modjo, Addis-Ambo, Addis-Debreberhane, Addis-Weliso and Addis-Ghoastion roads). The purpose of the study was to know the shear strength properties of expansive soil. Range of values of shear strength parameters (cohesion and angle of internal friction) were obtained based on unsaturated soil samples. According to the outcome of the research, the shear strength of expansive soil ranges from 30-150Kpa in cohesion and 3-25 degree in angle of internal friction in UU test on unsaturated soil. For saturated soil sample in UU test the cohesion ranges from 55- 94Kpa. There is a decrease in strength in the saturated samples, which shows that the degree of saturation and the suction pressure can have major influence on the shear strength of expansive soil.
URI: http://hdl.handle.net/123456789/2580
Appears in:Thesis - Geotechniques

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