公路隧道视觉疲劳缓解带设计初探

Preliminary Discussion on a Visual Fatigue Relief Zone in Highway Tunnels

本文对公路隧道视觉疲劳缓解带的设置条件与设置方式进行了初步探讨。分析表明:公路隧道长度大于设计速度72s行程时,宜设置洞内视觉疲劳缓解带;每段视觉疲劳缓解带的纵向长度不宜小于6s设计速度行程长度且不应小于120 m;视觉疲劳缓解带宜采用不变横断面方案;视觉疲劳缓解带的景观应简洁明了,山区公路隧道宜采用自然景观方案为好,城市公路隧道可以采用人文景观;视觉疲劳缓解带应采用恒定常态的展示方式。

The setting conditions and setting modes of a visual fatigue relief zone in highway tunnels were discussed.The analysis shows that when the length of the highway tunnel is longer than the 72 s running distance with designed speed,it is better to set the visual fatigue relief zone inside the tunnel.The longitudinal length of each visual fatigue relief zone should not be less than 6 s running distance with designed speed,meanwhile it should not be less than 120 m.The cross-section of the visual fatigue relief zone should be constant.The landscape of the visual fatigue relief zone should be clear and concise;the natural landscape is better to be used in the mountain road tunnels;cultural landscape is better to be used in the urban road tunnels;a constant normal display of the visual fatigue relief zone should be conducted in the road tunnels.