城市道路横截沟截流率有限元模拟

Finite element simulation on hydraulic efficiency of continuous transverse grates on urban road

横截沟在广场、公园、隧道入口等区域广泛应用,可有效收集路面雨水径流。文章依托杭州香积寺路西延工程,对不同降雨强度下的道路汇流过程进行了有限元数值模拟。模拟结果给出了道路汇流过程流场图及路面积水深度分布图。结果表明:径流流速在不透水路面段入口处最大,沿程逐渐减小;路面积水深度随雨强增大而增大,积水深度在横截沟处达到最大值;模拟工况下,横截沟截流量与雨强呈正相关关系,而横截沟截流率基本保持不变。研究结果可以为城市下穿隧道横截沟的优化设计提供参考。

Continuous transverse grates are commonly used in some urban or impervious areas(squares,parks,tunnel threshold zones,etc.),which can effectively collect the road surface runoff.Taking the Xiangjisi Road west extension project in Hangzhou City as an example,the finite element simulation on the road catchment process under different rainfall intensities was carried out.Graphs of the modelled flow field and the water depth distribution were presented.The results show that the runoff velocity reaches its highest value at the entrance of the impervious pavement and gradually decreases along the path;the water depth on the road increases with the rainfall intensity,and reaches its maximum value at the continuous transverse grates;the flow rate intercepted by the grates is positively correlated with the rainfall intensity,while the hydraulic efficiency remains almost the same.The results can provide a reference for the optimization design of continuous transverse grates of urban underpass tunnel.