In order to understand the behavior of wave-induced seabed liquefaction, according to wave and seabed soil characteristic of west Taiwan, a series of dynamic triaxiai tests have been performed to evaluate the seabed liquefaction behavior. In this study, the wave periods (as 1sec, 5see, 12see), soil depths (as σ'3'=30kPa, 50kPa) and soil relative densities (as Dr=35%, 55%) were considered to discuss the liquefaction behavior of the seabed under wave force. As revealed by the results of this study, the loading period would have a predominantly distinct effect on Ottawa sand in liquefaction resistance strength. Under low density and low effective stress, the effect was more obvious. In addition, for wave-induced seabed liquefaction problems, the numbers of wave cycles were considered up to 4000 times for some study case. Finally, the new method of evaluation method is proposed as a reference to evaluate wave-induced seabed liquefaction and liquefaction resistance strength.
Liquefaction is one of the most important and complex topics in geotechnical engineering. In traditional, most studies focused on earthquake-induced liquefaction at sandy stratum. But on nearshore area, seabed liquefaction caused by wave force was also one of the important geotechnical problems. Seabed liquefaction may cause sand drift, scour, undermining with incline, settlement and failure of the nearshore structures. Taiwan is located at the center of west Pacific. Therefore, Taiwan has 3 to 4 major typhoons per year, which would cause severe damages. Thus, in this paper, a series of dynamic triaxial test was conducted with Yun-Lin seabed soil and Ottawa sand. Different wave periods, soil depths and soil densities were taken as test conditions. The purpose of this study is to assess the stability of the nearshore area by evaluating the liquefaction resistance strength of seabed soil induced by wave force.
