基于合流视距的高速公路主线合流路段圆曲线最小半径研究  

Minimum radius of circular curve for merging section of highway mainline based on merging sight distance

作　　者：李洋 潘兵宏[2] 梅杰 谢振江 LI Yang;PAN Binghong;MEI Jie;XIE Zhenjiang(Hubei Provincial Communications Planning and Design Institute Co.,Ltd.,Wuhan 430051,China;School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051 [2]长安大学公路学院,陕西西安710064

出　　处：《铁道科学与工程学报》2022年第11期3283-3292,共10页Journal of Railway Science and Engineering

基　　金：中交科基金资助项目([2018]05号)。

摘　　要：针对目前有关高速公路互通式立交合流路段主线圆曲线最小半径研究较少的现状,且分流与合流区主线圆曲线最小半径指标相同的问题开展研究。明确合流视距是合流路段主线圆曲线最小半径的主要影响因素,对合流视距和合流段圆曲线最小半径分别展开研究。通过分析合流路段主线车辆的交通行为特征与驾驶人的操作特点,建立合流视距计算模型,并计算合流视距推荐值。考虑左偏和右偏曲线2种工况以及驾驶人视线的遮挡,建立满足合流视距的主线圆曲线最小半径计算模型。利用无人机进行数据调查,得到主线合流路段最外侧车道中车辆的视点位置横向分布规律,通过数据统计和分析,提出最外侧车道视点位置推荐值。将合流视距和视点横向位置推荐值应用于圆曲线最小半径计算模型中,得到满足合流视距的主线合流路段左、右偏圆曲线最小半径推荐值。研究结果表明:合流路段的圆曲线最小半径要求低于出口路段,且推荐值低于现有规范中的互通区圆曲线最小半径。研究内容重新定义了入口合流视距计算方法,并区分了不同工况下主线圆曲线最小半径建议值,对现有规范进行了补充和细化。研究结果加强了合流路段线形指标选取的灵活性,并为设计人员利用图解法初步检验合流段视距提供了思路。The study was carried out for the current situation that there was less research on the minimum radius of the mainline circular curve of the merging section of the highway interchange. The minimum radius of the mainline circular curve in the diverging and merging area was the same. Firstly, it was clarified that the merging sight distance was the main influence factor of the minimum radius of the mainline circular curve of the merging section. The merging sight distance and the minimum radius of the circular curve of the merging section were studied. By analyzing the traffic behavior characteristics of the merging section mainline vehicles and the operation characteristics of drivers, the merging sight distance calculation model was established, and the recommended value of merging sight distance was calculated. The minimum radius calculation model of the mainline circular curve to meet the merging sight distance was established by considering two working conditions of left-skewed and right-skewed curves and the obstruction of driver’s sight line. The data survey was conducted by UAV to obtain the lateral distribution pattern of the viewpoint position of vehicles in the outermost lane of the merging section of the main line, and the recommended value of the viewpoint position of the outermost lane was proposed through data statistics and analysis. The recommended values of merging sight distance and lateral position of viewpoint were applied to the minimum radius calculation model of circular curve, and the recommended minimum radius of left and right deviated circular curve of the merging section of the main line satisfying the merging sight distance was obtained. The results show that the minimum radius of the circular curve for the merging section is required to be lower than that for the exit section, and the recommended values are lower than the minimum radius of the circular curve for the interchange area in the existing specification. The research content redefines the entrance merge sight distance calcu

关 键 词：道路工程 高速公路 模型构建 数据采集 合流视距 圆曲线半径 视点横向位置 

分 类 号：U412.33[交通运输工程—道路与铁道工程]