下凹式立交桥内涝模型构建方法及原因分析

Modeling method and reason analysis of urban flooding in concave-down overpass area

以北京市GQM下凹式立交桥区排水系统为研究对象,CAD文件数据为基础,应用InfoWorks ICM建模软件,模拟GQM下凹式立交桥排水系统。通过基础数据整理、一维管网模型、二维地面模型的建立以及旱天、雨天模型校核,建立GQM桥区InfoWorks ICM内涝模型,为其他下凹式立交桥数学建模提供参考。通过模型结果的分析以及桥区现况的勘察可知下凹式立交桥的积水原因主要有桥区雨水口数量不足、布局不合理,管道、泵站设计标准偏低等,为规划改造下凹式立交桥区排水系统提供了直观的依据。

Taking the drainage system of concave-down overpass in GQM area as research object,based on CAD file data,Infoworks ICM software was used to simulate the system.Urban flooding model of drainage system in GQM area was built through the analysis of original data,the establishment of one-dimensional pipe network model and two-dimensional ground model,and the verification of wet and dry models,providing a mathematical reference for other concave-down overpasses.The analysis results and the survey of the existing state of bridge area show that the main reasons for waterlogging of the sunken overpass are as following：lack of gullies or the unreasonable layout of gullies,the low design standards of the pipeline or pumping,and so on.An intuitive reference is presented for drainage system reconstruction in sunken overpass areas.