大连港大窑湾北防波堤基床淘刷与治理试验研究

大窑湾港区是大连港集装箱核心港区,北防波堤直立段采用改进的梳式沉箱结构,受台风影响,空腔内栅栏板移位、基床被淘刷。为了认知基床淘刷原因,使用非线性波浪水槽进行模型试验研究。研究确认波浪传播至空腔内剧烈紊动、导致基床浮托力增大是栅栏板失稳、基床淘刷的主要原因。采用翼板开孔可有效减小基床浮托力,但增大了透过波浪和流速。综合考虑基础稳定性、透过波浪、施工条件等因素,确定了翼板开孔3 m、将栅栏板厚度由原来的0.5 m加大至1 m的治理方案。试验验证了该方案的可行性。

Experimental study on bed scour and treatment of Dayaowan north breakwater in Dalian port

Dayaowan port area is the main area of Dalian container port,of which the comb-type caisson structure was adopted for the north breakwater.Affected by typhoon,barrier boards inside the cavity were tilted and pushed,and the rubble filled bed was scoured.In order to acquire the causes of bed scour,we carry out a model test with the nonlinear wave flume.The analysis indicates that severe wave turbulence inside the cavity leads to significant buoyancy stress in bed,which is the the main cause of barrier board instability and bed scour.The wing plate trepanning scheme can effectively reduce the buoyancy stress in the bed,while there will be increased wave and velocity to some extent.Considering comprehensively the factors such as bed stability,wave penetration and construction conditions,we determine to open a 3 meters hole in the wing plate and increase the thickness of barrier boards from 0.5 m to 1.0 m.The model test demonstrates the feasibility of the plan.