Abstract
Kansai International Airport was constructed in Osaka bay as the first offshore airport in the world. At the construction site, more than 20m of the soft holocene clay layer and hundreds of meters of the pleistcene clay layer deposited. There were many important geotechnical issues, such as the soil stabilization of holocene clay layer, and the prediction of consolidation settlement of pleistcene clay layer. To solve these problems, we have dealt with many investigations, such as a lot of deep boring surveys. This report shows the approach of the settlement prediction technique, and countermeasure against the settlement on the site.
