Liquefaction Potential Assessment for Unsaturated Soil Based on Liquefaction Mechanism of Unsaturated Sand

Abstract eng:
In this study, author suggests the liquefaction mechanism of unsaturated sand and introduces a method of hazard evaluation based on it. Even under the unsaturated condition, sand with a highly compressible soil particle structure may lose effective stress due to cyclic shear and may reach the liquefaction. Based on the effective stress of unsaturated soil, it can be understood that the liquefaction is achieved when the pore air pressure equals pore water pressure and also equals the total stress. When the pore air can be assumed to be an ideal gas, a consideration of the volume change of pore air between the initial and final full liquefaction states should be established with the relation of the Boyle-Charles law. Therefore, the amount of volumetric compressions required for the unsaturated soil to liquefy will be determined theoretically. The equation of the unsaturated soil liquefaction was proposed in this study. So, it can be understood that the void ratio change required to cause liquefaction is a function of the initial degree of saturation, the confining stress, and initial pore pressure. A new scheme to evaluate the liquefaction potential is proposed. The proposed method for laboratory tests showed good performance when applied to a laboratory test.

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