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为了研究城市隧道出入口交通流的运行状态,以城市隧道交通流为研究对象,利用试验车调查了玄武湖隧道、鼓楼隧道和九华山隧道内交通流的动态加速度。借助加速度干扰计算模型,计算并分析了不同隧道交通流的加速度干扰值。借助仿真手段,得到城市隧道交通流状态与加速度干扰的关系图。根据该图表现出来的不同车辆运行特征,将城市隧道单行双车道服务水平划分为4个等级,并相应给出各级之间平均速度的取值范围。利用加速度干扰值可评价城市隧道出入口的交通流拥挤情况,从而为工程实践提供参考依据。
In order to study the traffic flow at the entrance and exit of urban tunnels, the traffic flow in urban tunnels was taken as the research object. The dynamic acceleration of traffic flow in Xuanwu Lake Tunnel, Drum Tower Tunnel and Jiuhuashan Tunnel was investigated using a test car. Acceleration interference calculation model is used to calculate and analyze the acceleration disturbance value of different tunnel traffic flow. By means of simulation, the relationship between traffic flow state and acceleration of urban tunnel is obtained. According to the different vehicle operating characteristics shown in the figure, the service levels of single-lane and double-lane urban tunnels are divided into four levels, and the range of the average speed between the levels is given accordingly. By using the value of acceleration disturbance, congestion of traffic flow can be evaluated at entrances and exits of urban tunnels, so as to provide a reference for engineering practice.