Abstract
The dynamic behaviour of unsaturated soil subjected to cyclic loading is considered using two stress state variables, net normal stress and matric suction. Though the influence of excess pore-water pressures in fully saturated soils has been investigated through experimental works for decades, it is significant in practice for unsaturated soil dynamic behaviour to be compared to saturated soil dynamic strength-deformation properties. Matric suction can be described as a scalar, which is useful in establishing safety factors and in mathematical simulations. This study focused on the dynamic behaviour of unsaturated soil leading to liquefaction failure. Solving practical problems requires considering the properties of unsaturated soil subjected to creep before introducing dynamic loading effects. This testing program consisted of a creep test and a cyclic loading test. Notably, a low suction range of soil structure is closely related to large deformations or leads to failure impacting the resistance of soil particle cohesion, including the macro-micro structure. Creep force was applied under lateral confining pressure, and suction measurements are indicating a gradual growth of excess pore-water pressure. Moreover, this study considered a dynamic triaxial compression test under the undrained condition for unsaturated soil with suction and creep history.
Highlights
The dynamic behaviour of unsaturated soil subjected to cyclic loading is considered using two stress variables net normal stress and matric suction
Matric suction can be described as a scalar, which is useful in the expansion and establishments of safety factors and mathematical simulations [1]
This study focused on the dynamic behaviour of unsaturated soil leading to liquefaction failure
Summary
The dynamic behaviour of unsaturated soil subjected to cyclic loading is considered using two stress variables net normal stress and matric suction. The dynamic behaviour of unsaturated soils leading to complete failure is related to some factors such as matric suction, degree of saturation, void ratio, and degradation. Soil creep [2] caused by intense rainfall or water level changes results in a reduction of matric suction by increasing excess pore-water pressure. Solving the practical problems mentioned above requires considering the properties of unsaturated soil that are subjected to creep progress before introducing dynamic loading efforts. This testing program consisted of a creep test and a cyclic loading test for matric suction control that were applied to the specimens. This study considered a dynamic triaxial compression test under undrained condition for unsaturated soil with historical suction and creep application
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