为改善公路隧道减光棚设计，对减光棚两侧透光区高度进行研究。首先，采用数值分析的方法研究减光棚采用不同配置时，棚下路面直射区域及亮度时变特性；然后，基于减光棚布设顶部散光板、两侧采用镂空设计的方式，建立数值分析模型，按照不同工况进行计算，分析减光棚各光学参数及路面亮度分布规律。基于直射区域、棚下路面照度、亮度均匀度需求3方面，对2种工况进行对比分析，针对案例工程建议减光棚南侧设置2 m镂空高度，北侧设置3 m镂空高度，以缓解进出洞口时亮度突变情况，降低洞口产生的眩光效应。通过改善隧道洞口的行车环境，可提高行车安全性及舒适性，使减光棚洞的使用效益最大化。
In order to
optimize the design of lightreducing shed of highway tunnels,
the height of lighttransmitting area on both sides of
lightreducing shed is studied. Firstly, numerical
analysis is used to study the direct irradiance area and brightness variations
of the road surface under different configurations of lightingreducing shed. By establishing numerical analysis models for
lightingreducing shed with topdiffusing plate and hollowdesign on both
sides, various optical parameters of lightingreducing
shed and the brightness distribution of road surface are analyzed under
different conditions. According to the requirements of direct irradiance area,
illuminance of road surface under the shed, and brightness uniformity, a
comparative analysis of two conditions is conducted. The lighttransmitting area height of lightreducing
shed are determined to be three meters for the north side and two meters for
the south side, which can mitigate the sudden brightness change when entering
and exiting the tunnel, and reduce the glare effect at the tunnel entrance.
Driving safety and comfort are enhanced with the improvement of driving
environment at the tunnel entrance.
