高等级公路中央分隔带绿化植物的防眩效果

Anti-glare Effect of Median Green Belt on High-Grade Highway

为了研究平、竖曲线路段绿化植物的防眩效果,提出了平直路段防眩植物株距和高度的计算方法,并计算了不同植物冠径和防眩角条件下的株距,以及不同道路横断面和交通组成条件下的防眩植物高度.对平曲线路段,提出了改进的防眩植物株距计算方法,计算了防眩角修正值;对竖曲线路段,提出了改进的防眩植物高度计算方法,计算了凹曲线路段防眩植物高度增高值,提出了凸曲线植物下沿防眩改善措施.研究结果表明：相对平直路段,平曲线路段防眩植物株距应减小0.3～3.8 m;凹曲线路段防眩植物高度应增加0.03～0.43 m.

In order to study the anti-glare effect of the median green belt on horizontal and vertical curve sections of highway,the methods for calculating the spacing and height of the plants along the median strip on straight sections were presented.The plant spacings for different plant canopy diameters and anti-glare angles,and the plant heights for different road cross-sections and traffic compositions were calculated.Then,an improved formula for calculating the plant spacing on horizontal curve sections was derived,and the corrected anti-glare angles were obtained.An improved method for calculating the plant height on concave vertical curve sections was proposed,by which the anti-glare plant height increments on the concave vertical curve sections were calculated.Meanwhile,some improvement measures were proposed to prevent the glare at the lower edge of the median plants on convex vertical curve sections.The results show that compared to that on straight road sections,plant spacing should be reduced by 0.3 to 3.8 m on horizontal curve sections;and the plant height on concave curve sections should be increased by 0.03 to 0.43 m.