Abstract
One of the world largest in-ground LNG tanks with the capacity of 200, 000KL is being constructed in Midorihama-cho, Chita City, Aichi Prefecture. The construction site is a reclaimed area underlain by the sedimentary soft rocks (Tokoname Group) of the Tertiary age. With the progress of the soil excavation inside the diaphragm-wall, an oval deformation with NE-SW compression was observed in the diaphragm-wall. From the geological study, it is concluded that the deformation was induced by the anisotropy o f the intrinsic regional stress field. To reflect on the design and construction of diaphragm-walls hereafter, the new findings, such as the method to estimate the direction of an eccentric soil pressure, are described in this paper.
