砂质海床特性对单桩所受波浪荷载的影响

砂质海床特性极大地影响波浪与海工单桩基础结构的相互作用,而将多孔介质海床简化为刚性、不可渗透固体海床,忽视了多孔介质海床对波浪能量的影响。研究砂质海床孔隙率、介质颗粒平均粒径对单桩所受波浪荷载的影响,设计5种不同海床特性的波浪水槽试验。研究结果表明:在相同波浪条件下,砂质海床结构内部的孔隙流对波浪能量产生衰减作用,随着颗粒直径的增大,波浪能量衰减愈加明显,单桩所受波浪荷载越小。当海床孔隙率较小,海床结构内部水流运动微弱,多孔结构对波浪消能作用不明显。当海床孔隙率进一步增加,海床结构内部水流运动增强,多孔结构对波浪消能作用显著,单桩所受波浪荷载明显减弱。

Effect of sandy seabed’s characteristics on wave force of a single pile

The characteristics of the sandy seabed greatly affect the interaction between waves and singlepile foundation structures,while simplifying the porous medium seabed into a rigid and impermeable solid seabed ignores the effect of the porous medium seabed on wave energy. This study investigates the effects of the porosity of the sandy seabed and the average particle size of the medium particles on the wave load on a single pile,and five wave channel experiments with different seabed characteristics are designed. The results show that under the same wave condition,the pore flow inside the sandy seabed structure has an attenuation effect on the wave energy. As the particle diameter increases,the wave energy attenuation becomes more obvious,and the wave load on the single pile is smaller. When the porosity of the seabed is small,the water flow inside the seabed structure is weak,and the porous structure has no obvious effect on wave energy dissipation. When the seabed porosity is further increased,the water flow within the seabed structure is enhanced,the porous structure has a significant effect on the energy dissipation of the wave,and the wave load on the single pile is significantly weakened.