Development of advanced and economical countermeasure against liquefaction for foundations of houses

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The advantage of utilizing partially saturated sand by "air-injection technique" for liquefaction countermeasure using the numerical analyses has been examined. One-dimensional effective stress analysis was carried out for liquefiable ground and improved ground by "air-injection technique". Numerical analysis for pile response, comparison to the case of the existing soil improvement and investigation of the effect of the spatial fluctuation of the degree of saturation were also conducted. The results show the effectiveness of the proposed technique. Experimental study is needed in the further development.