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    Effects of Matric Suction on the Shear Strength of Highly Plastic Compacted Clay
    (University of Khartoum, 2015) Elsharief, Ahmed M. ; Abdulaziz, O.A.
    Matric suction is one of the stress state variables that control the shear strength of unsaturated soil, therefore this work basically investigates its effects on the shear strength of a highly plastic unsaturated compacted clay soil from Sudan. Matric suction and drained shear strength were independently measured using the filter paper and the conventional shear box apparatus, respectively. The tested samples were all prepared at the same dry density but each sample had different moisture content, covering dry & wet of optimum, mainly to study the effects of variation in air and water phases (matric suction) on shear strength under different vertical stress values. From the tests results, it has been found that the shear strength of unsaturated soils is dependent on the soil moisture condition, i.e. soil suction, and under the same applied vertical stress the shear resistance and peak shear strength increased as matric suction increased and this increment is not linear. The lines representing the relationship between peak shear strength and matric suction for different values of vertical stress showed sharp increase in shear strength for the first portion of the curve whereas the lines are almost parallel for high values of matric suction. Also it is noticed that the lines tend to curve as the matric suction approaches a specified value (for this particular soil type this value was found to be within the range of 600 to 700 kPa).The shear parameter ϕb was found to be equal to the angle of internal friction of the soil when the matric suction is lower than the air entry value of the soil, whereas for higher values of matric suction this value becomes very small. It was found that the soil cohesion increased as matric suction increased and this increment is linear and the internal angle of friction of the soil did not experience significant change with change in matric suction. Hence it could be stated that the increase in soil shear strength due to increase of matric suction is a result of increase in soil total cohesion.
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    Wheata Grain Silos Project
    (University of Khartoum, 2003) Elarabi, Hussein
    The Building and Road Research Institute (BRRI) , University of Khartoum was requested by Wheata Grain Silos Co. to undertake a detailed geotechnical investigation program for the proposed silos in Port Sudan City. The proposed area is 90m by 100m. The investigation included drilling of 10 boreholes, performing in-situ and laboratory tests to reveal sub-soil profiles and reporting on the results with analysis and recommendation for foundation alternatives and treatments for the proposed structures on site. This report presents the results of field and laboratory testing programs. The field work was conducted during August 2003. The laboratory testing and geotechnical report were completed in the following weeks.
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    Rehabilitation Works in Sudan Cotton Company Stores Phase I
    (University of Khartoum, 1998-04) Elarabi, Hussein ; Fadul, A . I. ; A bdel Rahman, O. ; Tibin, Y.
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    Geotechnical Investigation for Atbara Bridge Foundation
    (University of Khartoum, 2000-08) Elarabi, Hussein
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    Evaluation of Completed Foundations of Qatar State Embassy in Khartoum
    (University of Khartoum, 2003-06) Elarabi, Hussein