基于改进防眩角的高速公路弯道段中分带防眩植物间距研究

Study on the Spacing of Antiglare Plants on Median Strip in the Curved Section of Freeway Based on Rectified Shading Angle

为了避免高速公路弯道路段因防眩植物设置不合理导致驾驶员受到眩光刺激,改进植物间距计算方法,本文依据高速公路弯道路段驾驶员的预瞄特性和车辆实际行驶轨迹,提出了弯道路段防眩角修正方法;通过对全国各区域高速公路中央分隔带常见植物配置的调研分析,总结出了部分中央分隔带常见植物的类别及冠幅参数;并根据车型、植物类别、圆曲线半径等不同应用环境计算出了相应防眩植物间距推荐值。研究表明:驾驶员在左向弯道路段行驶时,需要对防眩角进行修正;相同条件下小型车需要的防眩角更大;防眩植物间距设置时需要综合考虑防眩角大小、植物冠幅、圆曲线半径等参数。最后计算出了剑黎高速TJ-4-2标段中央分隔带防眩植物的间距建议值,平直路段为9.18 m,弯道路段为8.31 m。

To prevent drivers from glare due to unreasonable anti-glares plants settings and improve the plants spacing calculation method on curved section of freeway, this study proposed a method to correct the shading angle of freeway curve section based on the characteristics of driver’s preview and vehicle running track. According to the investigation and analysis of the common plant allocation on the median strip of freeways in different regions of China, this paper summarized the common plant categories and the parameters of crown width on median strip and calculated the recommended distance of antiglare plants on the basis of vehicle type, plant category, radius of circular curve and other different application environments.The results show that the shading angle should be corrected when the driver is driving on the left curve, and the shading angle of small vehicles is larger under the same condition. Parameters such as shading angle, plant crown width and radius of circular curve should be considered comprehensively when calculating the spacing of antiglare plants.In the end, the recommended spacing of antiglare plants on median strip of TJ-4-2 section of Jianli Freeway is suggested, which is 9.18 m in the straight section and 8.31 m in the curved section.