基于识别视距的互通式立交分流区竖曲线最小半径研究  

Study on Minimum Radius of Vertical Curve of Interchange’s Diverging Area Based on Recognition Sight Distance

作　　者：潘兵宏[1] 李成财 周锡浈 PAN Bing-hong;LI Cheng-cai;ZHOU Xi-zhen(School of Highway,Chang’an University,Xi’an Shaanxi 710064,China;PowerChina Huadong Survey,Design and Research Institute Co.,Ltd.,Hangzhou Zhejiang 311122,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《公路交通科技》2023年第8期170-176,共7页Journal of Highway and Transportation Research and Development

基　　金：河北省高速公路交通安全评价成套技术及高风险路段甄别技术研究项目(19275601D)。

摘　　要：为减少互通式立交分流区事故数,提高分流区道路运行安全性,考虑识别视距在分流区的重要性,提出了满足识别视距的分流区主线竖曲线最小半径计算模型与推荐值。计算模型中假定道路中线竖曲线半径与识别视距曲线一致,在几何理论分析的基础上,分别考虑了凹形竖曲线、凸形竖曲线两种不同的情况。凹形竖曲线分别考虑了夜间车照前灯与跨线构造物两个控制因素,凸形竖曲线则考虑视线将受到竖曲线最高顶点处的遮挡为控制因素,从而提出了基于识别视距的分流区主线竖曲线最小半径计算模型。结合《公路路线设计规范》相关指标的推荐值,基于分流区主线竖曲线最小半径计算模型,推算得到了满足识别视距的凹形竖曲线与凸形竖曲线的最小半径推荐值,并与《公路路线设计规范》的竖曲线最小半径规范值进行了对比。结果表明:凹形竖曲线的最小半径受夜间行驶时的车照前灯控制,满足车照前灯控制的夜间行驶所需要的凹形竖曲线最小半径均大于满足跨线构造物所需求的凹形竖曲线最小半径值;互通式立交区主线满足同等的推荐识别视距的凸形竖曲线半径比凹形竖曲线半径大得多,互通式立交范围内主线应尽量采用凹形竖曲线,采用凹形竖曲线相对于凸形竖曲线更有利于识别高速公路出口。In order to reduce the number of accidents and improve the road operation safety in the diverging area of interchange,considering the importance of recognition sight distance in the diverging area,the minimum radius calculation model and recommended value of the main line vertical curve of the diversion area that meet the recognition sight distance are proposed.In the calculation model,it is assumed that the radius of the vertical curve of the road centerline is consistent with the recognition sight distance curve.On the basis of the geometric theoretical analysis,the concave vertical curve and the convex vertical curve are considered respectively.The concave vertical curve considers the control factors of night headlights and flyover structures respectively,and the convex vertical curve considers that the sight line will be blocked by the highest vertex of the vertical curve as the control factor.Therefore,a calculation model of the minimum radius of the main line vertical curve in the diverging area based on recognition sight distance is proposed.Combining with the recommended values of relevant indicators in Design Specification for Highway Alignment and based on the calculation model of the minimum radius of the main line vertical curve in the diverging area,the recommended minimum radius values of concave vertical curve and convex vertical curve meeting the recognition sight distance are calculated and compared with the minimum radius values of vertical curves in the Design Specification for Highway Alignment.The result shows that(1)The minimum radius of concave vertical curve is controlled by the headlights during night driving.The minimum radius values of concave vertical curve meets night driving controlled by headlights are greater than that required for flyover structures.(2)The radius of convex vertical curve for the main line in the interchange area meets the same recommended recognition sight distance is much larger than that of concave vertical curve.The concave vertical curve shall be used as far a

关 键 词：交通工程 竖曲线半径 几何原理 识别视距 高速公路 

分 类 号：U412.33[交通运输工程—道路与铁道工程]