Abstract
The new improvement method that can reduce the liquefaction damage of the small structures by making the high permeable gravel layer near the ground surface is proposed. The proposed method makes the gravel layer under the outer circumference of the structure, and drainage to ground surface is provided. The effect of the proposed method is confirmed by centrifugal model tests. The proposed methods do not have the effect to prevent liquefaction, but it is possible to significantly reduce the inclination of the structure caused by liquefaction. It is most effective to carry out the measures in all directions of the outer circumference of the foundation. Applied the measures to a pair of opposing sides of the foundation is also large effective for reducing liquefaction damage.
