城市隧道口交通优化方案研究

Research on Traffic Optimization at the Exit Section of Urban Tunnels

目前城市隧道出口通行能力低,交通组织混乱等问题已经成为地下道路建设与管理亟待解决的问题,隧道出口衔接长度的合理设置将提高行车安全性,并且能够使交通流快速地通过路段。本文在各种设计标准值的基础上,对城市隧道出口交通流特性调查分析,从驾驶人在隧道中的视觉适应角度确定隧道出口的安全长度;根据相邻交叉口的排队延误特性,提出新的城市隧道出口衔接段长度的确定方法,并通过实例验证其可行性。该项的研究可对城市隧道出口的规划、设计和管理提供技术支持。

At present,the traffic organization at exit section of many urban tunnels is disordered,and the traffic capacity is low,which is a problem that should be solved for urban tunnel construction and management.Setting the coherence length of the exit section reasonably will improve the driving safety and made the traffic pass the road section quickly.On the basis of the recommended design standards,the paper investigates and analyzes the characteristics of urban tunnel traffic flow,then determines the safe length of the tunnel from the perspective of drivers visual adaptation.Based on the queuing delay characteristics at the adjacent intersections,a new method of determining the coherence length of the exit section of urban tunnels is put forward and the feasibility is verified by an example.The study will provide important technology support for urban tunnel planning,design,and management.