Abstract
Dynamic centrifugal model tests are carried out to confirm the effect that surface improvement using a high-permeability material has on reducing liquefaction damage to small structures. A gravel layer with a prototype thickness of 0.3–1.2m was laid under the model structure. Without improvement, the inclination of the model structure continued throughout the period of liquefaction, yielding a residual inclination of about 1/6.5. In cases with improvement by gravel, residual inclinations were 1/300 or less in all cases, even though most of the ground around the model suffered liquefaction.
