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The project for the field observation of the behavior of quay walls at West District of Kushiro Port, Hokkaido, Japan is introduced. Two caissons with the same dimensin were prepared and the backfill ground of the one was treated with sand compaction piles against liquefaction; the backfill ground of the other was not treated. Accelerometers, velocitimeters, pore water pressure cells, and earth pressure cells were installed for the observation of the behavior of the quay walls, that is the caisonns and backfill grounds. It is planed that the behavior of the quay walls during construction process and earthquake vibrations are observed with special attention to the effect of liquefaction of backfill ground.In this paper the test site of this project and the outline of the observation system are introduced. And a result of a verification test on the system of measurement is presented.

FIELD OBSERVATION OF THE BEHAVIOR OF LARGE-SCALED QUAY WALLS DURING EARTHQUAKE