Behavior of Small Building Foundations With Raft and Box Confinement During Liquefaction By Using Cyclic Simple Shear Test in 1g

Abstract eng:
Liquefaction occurs due to a cyclic shear stress by earthquake and buildings are damaged such as settlement or inclination. The confining ground under the building is one of the methods for preventing liquefaction in the ground, because it can restrain the shear deformation. In this study, cyclic simple shear test was conducted in 1-G for proposing the countermeasure method using a raft foundation with casing. The dispersing time of excess pore water pressure is the most important in this experiment. To decide more suitable coefficient of permeability of the model ground for this experiment, falling head permeability test was performed to find the coefficient by changing some mixing ratio of water with Na-CMC or glycerin. After the permeability test, simple shear test was conducted with some models. There are the follow conclusions by the result of this study. (1) The raft foundation with casing can reduce settlement and inclination of building. (2) Peak value of excess pore water pressure can’t be decreased in the casing. (3) The aqueous solution of Na-CMC is better to conduct simple shear test in 1-G for adjusting the time of dispersing excess pore water pressure than the aqueous solution of glycerin.

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