ABSTRACT
Saga plain is a typical lowland reclaimed from and affected by the high tides of the Ariake Sea. The soft, compressible and very sensitive Ariake clay, 15 to 30 m thick, gives rise to many difficult geotechnical problems due to its low bearing capacity, very large total and differential settlements and inadequate safety of earth structures. Various ground improvement techniques are practiced to modify the ground. Examples of preloading in conjunction with sandpacked and plastic board drains, deep mixing methods and piled–geogrid reinforced granular fill rafts, are presented.
