大型钢围堰结构对航道的影响及自身稳定性分析

Analysis of the Impact of Large Steel Cofferdam Structures on the Waterway and its Own Stability

为确保周围航道通行的安全以及桥梁施工安全,探究不同钢围堰结构对周围水流速度的影响以及钢围堰结构自身的稳定性。本文以椭圆度理论为基础,基于Fluent有限元软件,采用二阶迎风算法分析大型钢围堰结构对航道的影响以及钢围堰结构稳定性在水流中的影响。研究结果表明:相对椭圆度α=1的钢围堰对围堰周围水流的影响最小,对周围船只的航行影响最小;当α=0.33时,钢围堰既没有产生尾部卡门涡街也没有产生钢围堰两侧旋涡,对过往的船只以及桥体造成的影响最小;相对椭圆度α=0.33的钢围堰在受到最大压力的情况下,其围堰两侧所受到的拉力最小,相比其他3种类型的钢围堰稳定性最好。以上分析对维护航道通航安全有重要意义。

To ensure the safety of the surrounding waterway passageand bridge construction,the influence of different steel cofferdam structures on the surrounding water velocity and the stability of the steel cofferdam structure itself were investigated.On the basis of ellipticity theory and Fluent finite element software,the second-order upwind algorithm was used to analyze the influence of large steel cofferdam structures on the waterway and their stability in water current.The study concluded that a steel weir with a relative ellipticity ofα=1 has the least effect on the water flow around the weir and the least effect on the navigation of the surrounding vessels.Atα=0.33,the steel cofferdam produces neither trailing Karman vortex street nor vortices on either side of the steel cofferdam,causing minimal impact on passing vessels as well as the bridge.The steel cofferdam with relative ellipticityα=0.33 has the least tension on both sides of the cofferdam when subjected to maximum pressure and has the best stability compared to the other three types of steel cofferdam.The above analysis has important implications for the maintenance of navigational safety in the waterway.