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Progressive Change in Shear Strength of Yazoo Clay
The Yazoo clay is highly expansive in nature and extended over central Mississippi, Alabama, and southern Louisiana of United States. The expansive clay soil undergoes shrink-swell behavior due to seasonal moisture variation and weathering. Due to the high shrink-swell behavior, the shear strength of the soil reduces to fully soften or residual shear strength, which eventually leads to slope failure in this area. This phenomenon is very common in Jackson metroplex area in Mississippi and which cause damage to roadway and embankments. The current study investigates the changes in shear strength of the expansive Yazoo clay. Undisturbed specimens were used for the peak and residual tests with an effective normal stress of 25, 50, and 100 kPa, and then sheared under drained conditions. A shear displacement rate of 0.0025 mm/min was used to ensure drained conditions. For the fully softened shear strength, normally consolidated soil samples were constructed from a slurry mix, in accordance with the U.S. Army Corps of Engineers test procedure. The residual shear strength of the expansive soil was determined based on repeated loading direct shear test. The test results also indicated that the highest shear strength (c=18.4 kPa and φ=20.2o) was determined with the peak shear strength test, whereas the residual test generated the lowest strength (c=2.5 kPa and φ=10.5o).
Progressive Change in Shear Strength of Yazoo Clay
The Yazoo clay is highly expansive in nature and extended over central Mississippi, Alabama, and southern Louisiana of United States. The expansive clay soil undergoes shrink-swell behavior due to seasonal moisture variation and weathering. Due to the high shrink-swell behavior, the shear strength of the soil reduces to fully soften or residual shear strength, which eventually leads to slope failure in this area. This phenomenon is very common in Jackson metroplex area in Mississippi and which cause damage to roadway and embankments. The current study investigates the changes in shear strength of the expansive Yazoo clay. Undisturbed specimens were used for the peak and residual tests with an effective normal stress of 25, 50, and 100 kPa, and then sheared under drained conditions. A shear displacement rate of 0.0025 mm/min was used to ensure drained conditions. For the fully softened shear strength, normally consolidated soil samples were constructed from a slurry mix, in accordance with the U.S. Army Corps of Engineers test procedure. The residual shear strength of the expansive soil was determined based on repeated loading direct shear test. The test results also indicated that the highest shear strength (c=18.4 kPa and φ=20.2o) was determined with the peak shear strength test, whereas the residual test generated the lowest strength (c=2.5 kPa and φ=10.5o).
Progressive Change in Shear Strength of Yazoo Clay
Khan, M. S. (author) / Ivoke, J. (author) / Nobahar, M. (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 560-569
2019-03-21
Conference paper
Electronic Resource
English
Progressive Change in Shear Strength of Yazoo Clay
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