基于二维数学模型的串列圆柱桥墩对通航水流的影响

Influence of tandem-ranged cylindrical piers on the navigation flow condition based on 2D numerical model

规划中的四川江安长江第二过江公路桥采用钻石形串排圆柱型主塔,为了研究其主塔桥墩对该桥区河段各通航水力要素的影响程度,通过建立平面二维水流数学模型,模拟该河段方案实施前后的水流流场,从工程应用的角度分析串列圆柱桥墩对河段水流条件的影响。分析数模仿真结果得知:在各级流量下桥区河段水位、流速在工程实施前后变化较小,桥轴线横向流速较小,桥梁的建设对通航水流条件影响较小,不会对船舶安全通过桥区产生影响。

The Jiang＇ an second Yangtze River highway bridgediamond-shaped tandem-ranged cylindrical piers as its main towers. In under planning in Sichuan isorder to study the influence onwaterpower of the river reach under this bridge by the main tower piers,flow to simulate the flow field before and after the scheme is implemenadoptedthe navigablewe built a 2D mathematical model for theted, and analyze the influence on the flowcondition of this river reach by the tandem-ranged cylindrical piers from the view of engineering application. Byanalyzing the results of the mathematic model, we find that under different levels of flow, the changes of the waterlevel and velocity in the river reach under the bridge are small, and the transverse flow velocibridge is very slow, and the influence on the navigation flow condition by the construction of briwill not affect the ship safely passing through the bridge area