波流共同作用下海底管线周围海床的动力响应分析

Based on the Biot's consolidation theory, a dynamic poro-elasto-plastic constitutive model for a sandy seabed with buried submarine pipeline was established to analyzed the dynamic response of a sandy seabed under the combined wave and current loading. The distribution of excess pore pressure of seabed and wave pressure on the seabed surface were examined, the effects of different current velocity to the excess pore pressure under the combined wave and current loading were discussed. The numerical results showed that the existence of current affected the wavelength and wave period of wave pressure on the seabed surface remarkably; the existence of submarine structure reduced and slowed down the excess pore pressure of seabed under pipeline.