摘要
【目标】高速公路超高渐变段积水是公路交通安全的常见隐患,深入研究其汇水路径及积水分布特性具有重要意义。【方法】基于最大合成坡度原理建立超高渐变段最大汇水路径长度计算方法,基于离散相模型与欧拉壁膜模型进行路面降雨分析,系统研究了各几何参数对超高渐变段汇水路径及积水分布特性的影响。【结果】最大汇水路径整体为抛物线形。根据路径起始点位置的不同,流向呈现为2种,即“中央分隔带-硬路肩边缘-中央分隔带”和“硬路肩边缘-中央分隔带-硬路肩边缘”。最大汇水路径长度与纵坡呈正相关,当路径起始点在中央分隔带时,纵坡较小的情况下最大汇水路径长度增长更快。最大汇水路径长度随超高渐变率的减小逐渐增长,在较大纵坡条件下超高渐变率的影响更为显著。不同路幅宽度的最大汇水路径长度之比与路幅宽度的几何比例一致。沿最大汇水路径的积水分布趋势随纵坡的变化呈现为单峰、双峰及持续增长3种形式。超高渐变率及路幅宽度主要影响沿最大汇水路径的水膜厚度绝对值而对积水分布趋势影响有限。【结论】研究结果量化了不同几何参数组合下超高渐变段的汇水路径与积水分布情况,为超高渐变段的排水设计提供了数据参考。
[Objective]The water log at expressway superelevation transition section is a common hidden danger to traffic safety.The catchment path and water log distribution characteristics at superelevation transition sections are essential for improving road safety.[Method]A method was developed to calculate the maximum catchment path length based on the principle of maximum resultant gradient.The surface rainfall was simulated by using discrete phase model and Eulerian wall film model.The influences of various geometric parameters on catchment path and water log distribution characteristics at superelevation transition sections were systematically investigated.[Result]The maximum catchment path generally follows a parabolic shape.Based on different starting points of path,the flow directions are classified into two patterns,i.e.,median strip-hard shoulder edge-median strip,and hard shoulder edge-median strip-hard shoulder edge.The maximum catchment path length increases with the longitudinal gradient.When originating from the median strip,the maximum catchment path length growth is fast with smaller longitudinal gradient.The maximum catchment path length increases as the superelevation runoff decreases,especially with steeper longitudinal gradients.The ratio of catchment path lengths across different road widths corresponds to their geometric proportions.Water log distributions along maximum catchment path show three patterns with longitudinal gradient variation,i.e.,single peak,double peak,and continuous increase.The superelevation runoff and road width mainly affect the absolute thickness of water film,but have limited influence on the water log distribution trend.[Conclusion]This study quantitatively reveals the influence of geometric parameters on catchment path and water log distribution characteristics at superelevation transition sections.The results provide data support for the catchment design of superelevation transition sections.
作者
李海
陈嘉祺
谭明
汤铭锋
LI Hai;CHEN Jiaqi;TAN Ming;TANG Mingfeng(Guangxi Communications Investment Group Co.,Ltd.,Nanning,Guangxi 530028,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Guangxi Jiaotou Science and Technology Co.,Ltd.,Nanning,Guangxi 530028,China;Guangxi Expressway Maintenance Engineering Technology Research Centre,Nanning,Guangxi 530028,China;Guangxi Transportation Industry Key Laboratory of Road Smart Maintenance,Guangxi Communications Investment Science and Technology Co.,Ltd.,Nanning,Guangxi 530028,China)
出处
《公路交通科技》
北大核心
2025年第8期90-102,共13页
Journal of Highway and Transportation Research and Development
基金
广西交通投资集团2022年自主立项科研项目(桂交投发〔2022〕834号)。
关键词
道路工程
路面积水
数值仿真
超高渐变段
汇水路径
积水分布特性
road engineering
surface water log
numerical simulation
superelevation transition section
catchment path
water log distribution characteristics
