The authors have been researchign into the method of applyign compaction grouting method (CPG) to ground-improvement work against liquefaction of sandy soil under earthquakes. The CPG has been used mainly for correcting the differential settlement of buildings and structures and protecting culverts by compacting the soil around them. There are not many cases of the technique used for the prevention of liquefaction of sandy soil. Therefore, before applying the technique to actual grounds for that purpose, subjects such as establishment of a design and construction method, evaluation of improving effect, influence on surrounding soil, etc. have to be dealt with. The authors applied the technique to an actual ground and propose a design and construction method, which proved practical.
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