Abstract
During the 2011 Great East Japan Earthquake, houses, roads and lifelines suffered serious damege due to liquefaction at many excavated and replaced grounds in eastern Hirai district of Kamisu City. Main reasons of the damage were: i) differential ground settlement occurred at the edges of the excavated zones, and ii) penetration of houses into the ground. Then appropriate countermeasures to mitigate the damage during future earthquakes were studied by analyses and in-situ tests. As a result, the method of lowering the water table was selected. The applicability of the method to this district was studied by in-situ drainage tests.
