University of Khartoum

Effects of Matric Suction on the Shear Strength of Highly Plastic Compacted Clay

Effects of Matric Suction on the Shear Strength of Highly Plastic Compacted Clay

Show simple item record

dc.contributor.author Elsharief, Ahmed M.
dc.contributor.author Abdulaziz, O.A.
dc.date.accessioned 2020-10-07T07:11:17Z
dc.date.available 2020-10-07T07:11:17Z
dc.date.issued 2015
dc.identifier.uri http://khartoumspace.uofk.edu/123456789/27764
dc.description.abstract 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. en_US
dc.language.iso en en_US
dc.publisher University of Khartoum en_US
dc.subject Unsaturated; shear strength; matric suction; shear box; filter paper. en_US
dc.title Effects of Matric Suction on the Shear Strength of Highly Plastic Compacted Clay en_US
dc.type Publication en_US

Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show simple item record

Share

Search DSpace


Browse

My Account