波浪作用下抛石基床直立堤沙质底床中孔隙水压力响应

利用波浪水槽试验，对波浪作用下抛石基床直立堤沙质底床的孔隙水压力响应进行了研究．试验中观测了在不同波高、周期、水深和泥沙粒径等条件下，自由底床和有抛石基床防波堤的土体孔隙水压力的变化．试验结果分析表明，随着波高和周期的增大，孔隙水压力幅值增大；随着水深的增大，孔隙水压力幅值减小．建堤后，底床中的孔隙水压力会增大，有效应力会降低，对防波堤的稳定性会造成严重影响．同时试验结果也表明，把基于Biot固结理论的多孔弹性介质模型用于研究波浪作用下海床的动力响应是合理的．

Wave-induced Pore Pressure in Sandy Seabed near Vertical Breakwater of Rubble Mound

The interaction between wave,seabed and breakwater is important in coastal engineering.Many coastal structures have been damaged by the wave-induced seabed response.We will examine the issue of wave-seabedrubble mound vertical breakwater interaction through flume test.Based on the experiment result,the wave induced pore pressure around a vertical breakwater will be examined through a parametric analysis.It shows that pore water pressure increases with the increment of wave height and period,decreases with the depth of water.Permeability and thickness of sand bed are the most important factors influencing the pore-water pressure;and the pore-water pressure around breakwater are increased after its building.Effective stress is reduced,and it causes serious influence on the stability of the breakwater.Simultaneously,the experiment shows that it is reasonable to study wave induced pore pressure in sandy seabed based on Biot's poro-elastic theory.