The sand drain method was applied as a countermeasure to a road embankment constructed on an artificial island built on soft seabed. In order to estiamte the embankment settlement and its effects on the surrounding structures, the authors conducted field observations and carried out numerical simulations of two-dimensional consolidation. The results of our investigations showed (1) the numerical simulations slightly underestiamted the embankment settlement at the center, whereas the lateral deformation of subsoil at the end of embankment was slightly overestiamted, (2) the residual settlement estiamted from the numerical simulations five months after the construction of the test embankment was about 50percent of the settlement observed in the field, and (3) the lateral deformation at a lighter's wharf increased in the direction toward the sea immediately after the construction began but soon afterwards it became constant and was therefore considered to have been stabilized.
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