斜交高架桥对城市河道流场的影响

Impact of Skew Viaduct to Flood Flowing of Urban River

以青岛市新疆路快速路工程昌乐河段为例,采用平面二维水动力学数值计算方法,模拟了20 a一遇洪水时斜交高架桥工程前后河道沿程位及洪水流速的变化,并利用实体模型试验对其进行了验证。结果表明:受桥墩相互作用的影响,斜交桥桥墩的墩后尾流区具有弱偏移现象;桥墩群对水流的壅高值具有非线性叠加的特点,对河道水流具有明显的分割和控导作用;河道洪水位沿程呈现多峰值的特征,这与桥墩群的分布以及单个桥墩的类型有关。

Based on two-dimensional hydrodynamic numerical calculation method,the paper by taking the Xinjiang Road Highway Project of Qingdao City（the section in Changle River） as an example and verified the tests by using physical modeling,simulate the changes of the flood water levels and velocity in 20-year freguency under the influence of skew viaduct.The numerical simulation results show that due to the interaction of bridge piers,the wake zones,in the rear of the viaduct piers,drifted mildly;the banked-up water levels had the feature of nonlinear superposition because of the affection of piers.In addition,channel flood level had the characteristic of multiple-peaked values which was associated with the position and shape of piers.