非线性立波作用下砂质海床动力响应及液化研究

Studies on Non-linear Standing Wave Induced Sandy Seabed Dynamic Response and Liquefaction

利用傅立叶级数近似法求解非线性立波作用下海床表面波压力,基于波浪作用下海床动力响应的二维准静态模型以及液化判定标准,模拟非线性立波作用下海床动力响应以及液化深度。线性与非线性立波计算结果比较表明:当相对水深较大时,非线性立波波峰处波压力出现双峰,波谷处的波压力明显大于线性立波波谷处波压力;海床中孔隙水压力在波峰时也表现出双峰型特性,且波谷时的海床压力增大;在相同波浪条件下,非线性立波作用下海床更易液化,且液化深度大于线性立波作用下液化深度。

Wave pressures induced Fourier series approximation. Based on dynamic response due to waves and the by nonlinear standing waves on the two-dimensional quasi-static a sandy seabed are calculated by the model for computation of the seabed criterion of seabed liquefaction, the sandy seabed dynamic response and liquefaction depth are simulated. Compared with the linear standing waves,the wave pressures of nonlinear standing waves shows the double crest properties while the wave pressures at wave trough increases when the relative water depth is larger. The pore pressure of seabed also shows the double crest variation and increases at wave trough. For the same wave conditions, sandy seabed is more easily liquefied and liquefaction depth is larger under nonlinear standing waves than linear standinz waves.