파랑-지반 상호작용에 의한 해저지반의 동적응답 수치해석법 검증

Seabed may undergo large excess pore water pressure in the case of long duration of high wave loading. This excesspore water pressure may reduce effective stress and, consequently, the seabed may liquefy. Thus, it is necessary todevelop a numerical technique which can precisely evaluate the dynamic response of seabed due to wave action. Inthis study, a new numerical technique named mixed model (2D NIT & FLIP models) was proposed. The dynamic wavepressure and water flow velocity acting on the boundary between seabed and the wave field was estimated using 2D-NITmodel. This result was used as input data in FLIP program for investigation of dynamic response of seabed. To securethe reliability of the mixed model, the numerical analysis results of the mixed model were compared with Yamamoto’ssolution and Chang’s experiment results. The comparison results indicated that there were some differences betweenthem, but the general trend of the effective stress increment and the excess pore water pressure along the depth ofseabed was similar to each other. Thus, this study clearly supports the plausibility of the numerical analysis of the mixed model.