基于运行速度的特长公路隧道纵坡坡率对交通安全影响

关于运行速度的研究一直是交通安全学科研究的热点和焦点。然而,研究多以道路场景为研究对象,多关注于建立运行速度预测模型,少有以特长隧道为研究对象,并关注于纵坡坡率取值对交通安全的影响。论文通过实测6座特长隧道进、出洞口以及洞内各紧急停车带处共计46个断面处的车辆行驶车速,计算得到了小客车、中型车、大型车各纵坡坡率下的运行速度和平均速度。分析结果发现：1)大型车驾驶员对特长隧道纵坡坡率敏感界限约为±0.75%；2)特长隧道纵坡坡率下坡取值-1.45%~-1.95%、上坡取值0.5%能够减小中、大型车辆运行速度与平均速度之间的速度差,有利于特长隧道内的交通安全。该项研究可为特长隧道纵坡坡率的设计取值提供科学指导。

Study on Influence of Longitudinal Slope Rate of Extra-long Highway Tunnel on Traffic Safety Based on Operating Speed

In the field of traffic safety, research on the operating speed has always been a hot spot and focus. However, most of the researches take road scenes as research objects, and more attention is paid to establishing operating speed prediction models. There are few scholars take extra-long tunnels as research objects, and pay attention to the impact of vertical slope rate on traffic safety. This paper measured 46 sections^, running speed of the vehicles in 6 extra-long tunnels, which includes the entrance and exit openings, and the emergency parking zones in the caves, and calculated the average running speed and operating speed of small passenger cars, medium-sized cars and large vehicles. The analysis results show that: 1) to the large-scale vehicle, the sensitive limit slope of the extra-long tunnel is about ±0.75%; 2) It can reduce the speed difference between the operating speed and the average speed of the vehicle, under the condition that the longitudinal slope of the extra-long tunnel is -1.45%~-1.95% and 0.5%, which is beneficial to traffic safety in the extra-long tunnel. This study provides scientific guidance for the design value of the slope of the extra-long tunnel.