“■”型浮箱式防波堤运动特性和锚链力试验

Experimental study on motions and mooring forces of ■-type pontoon floating breakwater

通过二维断面物理模型,试验研究了"■"型浮箱在规则波作用下的运动量和锚链力与相对宽度、水深、波高、锚链与竖向初始夹角以及锚链拖地长度等影响因素的变化关系。结果表明:波高是影响浮箱运动量和锚链力最敏感的因素,浮箱升沉、横摇和锚链力随波高增大而增大;相对宽度与水深的改变对锚链力的影响较为随机,锚链力并不随着波周期增大而增大,主要原因是波周期越长,浮箱的消浪效果较差的缘故;锚链与竖向初始夹角增大,浮箱横移有所减小,对锚链力而言,30°夹角较为合适;锚链拖地长度加长,横移明显增大,锚链力则有所减小。与矩形浮箱相比,""型浮箱的横移和升沉要大于等于矩形方箱,横摇则小于矩形浮箱,两者的锚链力相差不大。

By 2D physical model test of＂ ＂■-type pontoon under the regular wave action,the relation between the motions and mooring forces with relative width,water depth,wave height,angle between mooring axes andvertical at the joint,mooring lie length and so on were studied. The results show that motions and mooring forces are high sensitive and regular to wave height,the heave and roll of pontoon and mooring forces increase obviously with wave height increasing. Influence of relative width and water depth to mooring forces is random. It does notincrease with wave period increasing, because wave dissipation of pontoon could reduce when wave period increasing. With the increasing of mooring angle, pontoon sway could reduce, and 30° is appropriate for mooring force.When the mooring lie length is lengthening, pontoon sway increases obviously and mooring forces reduce. Comparing with rectangle pontoon,■-type pontoon sway and heave motions are greater than or equal to the rectangle pontoon, and the mooring forces of two types differ little.