降雨条件下高速公路超高段水流特性仿真研究  

Study on Water Flow Characteristics of Superelevation Transition Section of Freeway under Rainfall Conditions

作　　者：孙毅凯 邹静蓉 罗大天 王刚 SUN Yi-kai;ZOU Jing-rong;LUO Da-tian;WANG Gang(College of Civil Engineering,Central South University of Forestry Science and Technology,Changsha Hunan 410000,China;Hunan Communications Research Institute CO.,LTD.,Changsha Hunan 410000,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410000 [2]湖南省交通科学研究院有限公司,湖南长沙410000

出　　处：《计算机仿真》2023年第12期186-192,共7页Computer Simulation

摘　　要：为研究降雨下道路超高过渡段水流特性,利用Fluent流体仿真软件建立了高速公路路面水流的仿真模型,采用RNG k-ε模型求解流体域,DPM模型和EWF模型耦合计算实现降雨和降雨收集过程的模拟。在验证了模型可行性的条件下,分析了超高过渡段路面水膜厚度及水流路径长度随降雨强度、纵坡、超高渐变率等的变化规律。结果表明,路表水膜厚度随降雨强度的增大而增大,随纵坡和超高渐变率的增大而减小;最长水流路径长度随纵坡的增大而增长,随超高渐变率的增大而减小,但与降雨强度无关。在总体趋势上水膜厚度会随着水流路径的长度增加而增加。最后基于4mm的临界水膜厚度,给出了水流路径长度的控制值,在设计时可以通过设置超高段横向截水沟减少水流路径长度,以此来控制路面水膜厚度。In order to study the flow characteristics of superelevation transition section under rainfall,a simulation model of freeway surface water flow was established using Fluent fluid simulation software.RNG k-εmodel was used to solve the fluid domain,and the a coupling calcalation between the DPM model and the EWF model was used to simulate the rainfall and rainfall collection processes.Under the condition of verifying the feasibility of the model,the variation rules of pavement water film thickness and flow path length with rainfall intensity,longitudinal slope and su⁃perelevation transition ratio were analyzed.The results show that the water film thickness increases with the increase of rainfall intensity,and decreases with the increase of longitudinal slope and superelevation transition ratio;The lon⁃gest flow path increases with the increase of longitudinal slope and decreases with the increase of superelevation tran⁃sition ratio,but has nothing to do with rainfall intensity.In general,the water film thickness increases with the length of the flow path.Finally,based on the critical water film thickness of 4mm,the control value of the flow path length was given.In the design,the water film thickness can be controlled by setting a transverse intercepting ditch in the superelevation transition section to reduce the length of flow path.

关 键 词：道路工程 水膜厚度 超高过渡段 仿真计算 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]