The mechanism analysis of wave-induced seabed liquefaction

This paper conducts the behaviors of seabed sand under wave loading by experimental results in which a series of Chien's auto-triaxial testing system type (11). The tested sand was sampled at northeast coastal zone of Taiwan. According to the in-situ wave periods, the cyclic loading periods were adopted as 1, 5, 9 and 12 sec. The specimens prepared by moist tamping method under different relative densities and different effective confining pressures. A series of dynamic triaxial testing was performed to evaluate the mechanism of wave-induced seabed liquefaction. In this study, the wave period would have a predominantly distinct effect on seabed sand in liquefaction resistance strength. The liquefaction resistance of seabed sand would increase as wave period increased. Finally, combined with Near Shore Spectrum Wave Model, the experimental results and referred Ishihara & Yamazaki (1984), a new modified seabed liquefaction evaluation method was proposed.