Abstract
This study developed a new method using buttress-wall type of ground improvement in order to reduce the wall deformation during large scale excavation work. The reduction concept of this system is explained with some effect. And centrifugal model tests have been used to clarify this concept, while in-situ monitoring has been also carried out to confirm the effectiveness of this system.
It was found that the reduction in lateral deformation of the retaining wall is closely related to the shape of buttress-wall type of ground improvement and also to the characteristics of the whole retaining system. We concluded that the expected improvement effect can be achived both at a improvement ratio of about 10 to 20% of imprved area, and at a narrow interval less than 7.5m between two rows of the buttress walls.
