公路隧道圆曲线半径最小值探究  

Exploration of the Minimum Radius of Circular Curves in Highway Tunnels

作　　者：朱然博 ZHU Ranbo(Nanjing Institute of City&Transport Planning Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]南京市城市与交通规划设计研究院股份有限公司,南京210000

出　　处：《交通科技》2025年第1期86-90,共5页Transportation Science & Technology

摘　　要：公路隧道出入口存在明暗适应和路面摩擦系数降低的问题,且驾驶人在隧道弯道的视线会受到侧墙遮挡,导致实际视认距离可能低于停车视距,增加行驶风险。基于隧道曲线半径、横净距和可用视距的关系,提出满足横向稳定性和停车视距要求的公路隧道圆曲线最小值。结果表明,左转的可用视距小于右转,且差异随设计速度增加而增大。设计速度为20~60 km/h时,圆曲线半径不应低于250 m或10倍车速;设计速度为80~120 km/h时,隧道中段圆曲线半径最小值应为规范极限值的1.75~3.72倍,出入口圆曲线半径最小值应为极限值的2.65~4.66倍。There are problems with adapting to light and dark conditions and reducing road friction coefficient at the entrance and exit of highway tunnels,and the matters of drivers'line of sight in tunnel curves being obstructed by side walls,resulting in actual visual recognition distance being lower than stopping sight distance and increasing driving risks.Based on the relationship between tunnel curve radius,lateral clearance,and available sight distance,the minimum curve radius for highway tunnels in accordance with lateral stability and stopping sight distance requirements was proposed.The results show that the available sight distance for left turns is less than that for right turns,and this difference increases with design speed.For design speeds between 20 km/h and 60 km/h,the curve radius should not be less than 250 m or 10 times the speed.For design speeds between 80 km/h and 120 km/h,the minimum curve radius in the middle section of the tunnel should be 1.75~3.72 times the standard limit value,and the minimum curve radius at the tunnel entrance and exit should be 2.65~4.66 times the limit value.

关 键 词：隧道曲线 横向稳定性 停车视距 圆曲线半径 

分 类 号：U412[交通运输工程—道路与铁道工程]