Development of cost effective liquefaction countermeasure technique by air injection and evaluation of its impact to on geo-environment.

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Objective of this research is to develop a cost effective liquefaction countermeasure technique by air injection and to propose a design and execution manual. The following items are in particularly studied.(1) Mechanism of instability of existing structures when foundation soil immediately below the structures is desaturated.(2) Evaluation of effectiveness to reduce deformation and settlement during strong base shaking.(3) Relationship between liquefaction strength ration and volumetric strain for silt and silt mixed sand.(4) A design and execution manual is published.