Theoretical analysis of random wave-induced seabed response and liquefaction

Based on general Biot's dynamic consolidation theory, a simple analytical model for simulating random wave-induced seabed response and liquefaction is established and solved together with stable and effective algorithm. The influence of random wave loading is investigated by comparing with the corresponding linear regular wave results with similar representative parameters. The results of comparison show that the distributions of amplitudes of pore wave pressure and effective stresses along depth in seabed are similar by using two different wave theories, but the dynamic response of seabed under random wave loading shows clear irregularity, and these amplitudes are greater than those under linear regular wave loading on the same quantity level. Compared with the liquefaction depth induced by linear regular wave loading, the result computed with random wave theory is much deeper. Therefore, the stochastic feature of random wave loading has to be duly taken into account in evaluation of safety and stability of various marine structures and offshore facilities.