摘要
速度是停车视距中最重要的计算参数,而现有停车视距模型的修正计算中较少考虑山岭隧道交通环境对车辆行驶速度的影响。为研究山岭隧道接近段速度流量特性,选取重庆具有代表性的4条山岭隧道开展交通观测现场实验。利用山岭隧道接近段车速和车流量数据,分析车流量和速度的时空特性分布规律与统计学关系,建立山岭隧道接近段车速和流量关系模型的函数表达式,推导基于流量与速度特性的山岭隧道接近段停车视距公式,并与相关标准和规范的取值进行比较,揭示其变化规律。结果表明,山岭隧道接近段车速呈现先减小后增加的变化规律;车流量与车辆行驶速度显著相关,经拟合得到拟合判定系数R^(2)=0.9的速度流量模型;相同速度下,修正后停车视距计算值约为规范计算值的1.07~1.21倍;修正值与规范值的差值随车速增大而增大,修正后的停车视距长度至少可满足70%驾驶员的需求。在相应规范的基础上,考虑交通量对停车视距中速度的影响,提高山岭隧道接近段行车安全水平。
Speed is the most important calculation parameter in stopping sight distance.However,the existing correc⁃tion computation of the model of stopping sight distance does not consider the impacts of traffic environment in moun⁃tain tunnel on the driving speed.Four representative mountain tunnels in Chongqing are selected to carry out field ex⁃periments,thus studying characteristics of speed flow in the approaching section of mountain tunnel.The data of speed and traffic flow in the approach section is used to analyze the distribution law and statistical relationship of traffic flow and speed.Then a model of the relationship between vehicle speed and traffic flow in the approaching section is devel⁃oped to derive the stopping sight distance formula based on the characteristics of speed flow.The values of relevant standards and norms are compared to reveal the law of change.The results show that the speed of the approaching sec⁃tion of the mountain tunnel decreases first and then increases.Traffic flow is significantly related to vehicle speed.Af⁃ter fitting,a calculation model with coefficient R^(2)=0.9 is obtained.At the same speed,the modified value is about 1.07 to 1.21 times of the standard value.The greater the speed,the greater the differences.The modified stopping sight distance length can meet the needs of 70%drivers at least.Based on the corresponding regulations,the impacts of traffic flow on vehicle speed of the stopping sight distance is considered to improve the driving safety level in the ap⁃proaching section of the mountain tunnel.
作者
梁波
李硕
钟升明
蒲俊勇
LIANG Bo;LI Shuo;ZHONG Shengming;PU Junyong(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China)
出处
《交通信息与安全》
CSCD
北大核心
2021年第2期36-42,52,共8页
Journal of Transport Information and Safety
基金
国家自然科学基金项目(51878107)资助。
关键词
交通安全
山岭隧道
停车视距
交通流理论
隧道接近段
traffic safety
mountain tunnel
stopping sight distance
traffic flow theory
approaching section of tunnel
