ABSTRACT
The mechanism of wave-seabed-structure interaction is an important concern for designing offshore facilities, such as pipelines, anchors, marine platforms and breakwaters. In the field, concrete armour blocks at the toes of many marine structures have been found to subside into the seabed; wave-induced liquefaction has been identified as the reason for this problem (Silvester and Hsu, 1989). Moreover, it has been reported that some such structures have possibly failed due to seabed instability (Lundgren et a/., 1989; Silvester and Hsu, 1989).
