作用于二层海洋中大直径透空圆环墩柱上的波浪渗流力

Wave-induced Seepage Forces on the Large Diameter Porous Vertical Circular Annular Cylinder in Two Layer Ocean

基于Biot渗流固结理论与层化海绕射波理论,应用特征函数展开法,研究了二层海洋中立于可渗弹性海床上透空圆环墩柱的波浪渗流力问题,给出了表面波和内波所致波浪渗流压力场的解析解式,由此计算了作用于固立透空圆环墩柱底部上由波浪渗流压力所导致的浮托力和倾覆力矩。计算结果表明圆环柱外表面的透空性对表面波和内波的波浪直接作用具有明显的减弱效应,而对波浪渗流倾覆力矩也具有一定的减弱效应。内波所致波浪渗流倾覆力矩可能超过表面波对应的作用。圆环墩柱内外柱半径比减小对波浪力矩的减弱效应较渗流倾覆力矩更为明显。

Based on the Biot consolidation theory and the two layer ocean diffracted wave theory, the wave seepage forces on vertical porous circular annular cylinder resting on porous elastic seabed in two layer ocean has been investigated by applying the eigenfunction expansion approach. The analytical solu- tions to seepage pressure fields caused by surface wave and inner wave are given respectively and then the wave-induced lift force and overturn moment caused by the seepage pressure on the bottom of vertical por- ous circular annular cylinder are evaluated. The results demonstrate that the porosity of the external sur- face of the cylinder will lead an obvious reduction in direct wave loads on cylinder and certain reduction in seepage overturn moment on the bottom of cylinder. Inner wave-induced seepage overturn moment may be greater than that induced by surface wave. Decreasing the ratio of the cylinder＇s inside diameter to out- side diameter will lead more obvious diminishing effect of direct wave moment than that of wave-induced overturn moment.