准椭圆沉箱群墩结构波浪力试验研究

Experimental study of wave force on multiple quasi-ellipse caisson structure

通过物理模型试验研究不规则波对准椭圆沉箱群墩结构波浪力的影响.试验中入射波向为0°～22.5°,平均周期为1.03～1.63s,准椭圆沉箱的相对间距L/D(L为沉箱间中心距、D为沉箱宽度)采用2.00、2.68和3.00.试验的模型比尺为1∶50.试验波谱采用改进的JONSWAP谱,试验包含72个不同的试验组次.对试验数据进行统计分析,给出了入射波向、周期、相对间距等因素与准椭圆沉箱所受波浪力之间的关系,并讨论了准椭圆沉箱侧壁开孔对结构物所承受波浪力的影响.研究结果表明,沉箱相对间距的增大可以减小沉箱承受的正向波浪力;侧壁开孔可以显著降低沉箱承受的横向波浪力.

The irregular wave forces on quasi-ellipse caisson structure are investigated through physical model experimentally. The incident wave directions are arranged from 0° to 22.5° , and the mean wave periods are from 1.03 s to 1.63 s. The relative spacing L/D of the caisson, where L is the center distance between the caissons and D is the width of the caisson, is 2.00, 2.68 and 3.00 respectively. The model scale of 1 ： 50 is adopted here. 72 cases of irregular waves based on the modified JONSWAP spectrum are considered. The statistical analytical results of different test cases are presented. The wave forces of the open quasi-ellipse caisson are compared with those of the non-open quasi-ellipse caisson. Furthermore, the relationship between the wave forces and the parameters, such as incident wave direction, wave period, relative spacing of the caissons and hole on the caisson wall, is also discussed. The experimental results indicate that the inline wave force on the caisson can be reduced with the increasing of relative spacing, and the perforated quasi-ellipse caisson can significantly decrease the transverse wave force.