城市立交桥暴雨积水数值模拟

立交桥及其周围地形特殊,雨天较易发生积水,一旦积水则对交通产生较大影响,因此有必要对积水成因及对策措施进行分析研究。文中以SWMM为基础,将立交桥排水系统概化为排水管网,易积水地段概化为蓄水池,对北京市万泉河立交桥的暴雨积水进行数值模拟,计算不同频率降雨、排水控制条件下路面积水和排水情况,给出桥体附近各个积水点的积水深和积水历时,并分析原因、提出改进措施。该研究可作为城区暴雨积水决策支持系统的一部分,以供防汛和交通部门参考。

Simulation of Storm Waterlogging Value of Urban Interchange Bridges

Interchange bridges and their around terrain are complex,waterlogging often occurs during rain.Once waterlogging occurs,the traffic is influenced.Therefore,it is necessary to analyze and study on the cause of waterlogging and countermeasures.In the paper on the basis of SWMM the drainage system of interchange bridges is generalized drainage piping network,the sector where is easy to waterlogging is generalized storage tank.It also makes the value simulation of the storm waterlogging in Wanquanhe Interchange Bridge in Beijing City to calculate the pavement waterlogging and drai￣nage conditions under different frequent rainfall and drainage control conditions.So it gives the waterlogging depth and waterlogging period at every waterlogging point near the bridge body and analyzes the cause and puts forward the measure for improvement.This study could be made as a part of supporting system of storm waterlogging decision in the urban district to provide the flood control department and communications department for reference.