Development of a countermeasure against sand liquefaction by reducing thedegree of saturation of foundation soils

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A countermeasure against sand liquefaction by desaturation was investigated. The method to evaluate the degree of saturation by electric resistivity and the numerical method to evaluate the area of unsaturation were investigated. The electro-conductivity of the pore water and the area to be measured have significant effects on the correlation between the degree of saturation and the electrical resistivity. It is possible by using the present numerical calculation method to qualitatively estimating the distribution of degree of saturation in horizontal direction around the well for injecting air or micro-bubble water. It is important to precisely evaluate the hydraulic characteristics and the anisotropy of permeability of in-situ soils and the volume of injected air or micro-bubble water for quantitative evaluation of the area of unsaturation.