A new technology for port construction using dredged material is proposed. The proposed technology (SG-Wall) is the combination of stabilization teclmique (S) of dredged material and geogrid (G) for quay wall (Wall). The target of the technology is both new construction of a quay wall and renewal of an existing quay walls for very large ships, which requires a large water depth in front of the quay.
　The authors conducted two series of static tests to examine the behavior of the composite material of stabilized soil and geogrid. The authors also made a 1/24-scale model of a quay wall with -16 m water depth, and examined the feasibility of the proposed technique. Since the seismic resistance is the most important issue for Japanese port structures, behavior of the model under seismic shakings were experimentally examined using the under water shake table. The test results suggest that the proposed method is feasible to practical construction field and the quay wall constructed by this technique have a high seismic resistance. The practical construction scheme of the technmlogy for both caisson-type wall and sheet pileーtype Wall is also summarized in the report.