沉箱防波堤沙质底床对波浪动态响应的研究

On wave-induced dynamic response on sandy seabed around caisson breakwater

海床破坏同孔隙水压力的分布有着密切的关系。利用波浪水槽试验,对波浪作用下沙质底床的孔隙水压力响应进行了研究。试验中观测了不同波况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。结果分析表明,土体孔隙水压力受波高、周期、水深、泥沙粒径、沙床厚度的影响较大,建堤后,底床中的孔隙水压力会增大;堤中断面以前海床中的孔隙水压力均较大。

It has close relation between seabed destruction and distribution of pore water pressure. A flume test is used to analyze the variation of pore water pressure, and behavior of different areas in sand bed of breakwater under different wave conditions. Some phenomena obtained from the tests show that hydrodynamic features, in particular wave height, period, water depth, sand size and sand depth are the more important factors influencing the pore water pressure; and the pore water pressure around caisson breakwater will be increased after it＇s built.