Effects of remedial measures against liquefaction at 1993 Kushiro-oki earthquake

ABSTRACT

During the 1993 Kushiro-Oki earthquake of magnitude 7.8, Kushiro Port being located at 15 km from the epicenter was shaken with a peak horizontal acceleration of 0.47g. Many of the quay walls at the Kushiro Port suffered damage due to liquefaction of backfill sand. However, the quay walls having backfill sand compacted as measures against liquefaction survived the earthquake without damage. In these quay walls, gravel drains were also used as a part of the liquefaction remediation in the vicinity of the walls. Since the contrast in the perfomance of those quay walls are of significance in the engineering practice, the present paper is devoted to report the details including the recorded earthquake motions and the ground conditions.(AU)