University of Khartoum

Influence Of Matric Suction On The Shear Strength Of Compacted Clay Soils

Influence Of Matric Suction On The Shear Strength Of Compacted Clay Soils

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Title: Influence Of Matric Suction On The Shear Strength Of Compacted Clay Soils
Author: Dafaallah, Mohammed Abdalsalam Abdallah
Abstract: The objective of this research is to study the influence of soil matric suction on the shear strength of compacted unsaturated clay soils from Sudan. The studied soils were obtained from different locations; from Al-Gerif, Abyei and Wau. Basic identification and classification tests were performed. The matric suction of the soils was determined at different moisture contents using filter paper method and the soil water characteristic curve (SWCC) was obtained. The direct shear test was conducted on the soils at different moisture contents (18, 20, 22, 25 and 28%) and at the same dry density. The test results have shown that shear resistance increases with increase of matric suction and decrease in water content. The air entry value was determined from the soil water characteristic curve for the three tested soils. The relation between peak shear resistance and matric suction is bilinear; the break in the relationship took place at the air entry value of the soils which is 2200KPa, 600 KPa and1800 KPa for Al-Garif, Abyei and Wau soils, respectively. The friction angle showed slight increase with increase in matric suction, therefore the increase in shear resistance with decrease in water content could be attributed to increase in total cohesion.
Description: 86page
URI: http://khartoumspace.uofk.edu/123456789/17065
Date: 2015-11-12


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