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为了研究大型活动消散过程中交通流分布状况,分析了大型活动中突发事件对交通流分布的时空影响特征,总结了突发事件下常用的交通管制和疏导措施,将静态多路径交通分配方法与元胞传输模型(CTM)相结合,设计出了适合突发事件下的准动态交通分配方法。对一个小规模路网进行仿真,计算了突发事件下各交叉口节点的拥堵时刻,研究了路网拥堵的形成及消散的时空变化规律,并对两组不同管控方案下交通流疏散效率进行了对比。对比结果表明:不同控制方案下的路网在仿真时段内平均车辆延误分别为197、232 s.pcu-1,由该指标可以判断方案一优于方案二,因此,基于CTM的准动态交通分配方法可定量评价突发事件下交通组织方案的效果。
In order to study the distribution of traffic flow in the process of dissipation of large-scale activities, this paper analyzes the spatiotemporal characteristics of emergencies on traffic flow distribution in large-scale activities, summarizes the traffic control and grooming measures commonly used in emergencies, and presents the static multi-path traffic assignment Combined with the cellular transport model (CTM), a quasi-dynamic traffic assignment method is designed for emergent events. The simulation of a small-scale road network, calculate the congestion time of each node under the emergencies, study the formation of the road network congestion and the spatial and temporal variation of dissipation, and the efficiency of evacuation flow under two different control programs Contrast. The comparison results show that the average delay of vehicles under different control schemes during the simulation period is 197,232 s.pcu-1, respectively, which can be judged to be superior to scheme II. Therefore, quasi-dynamic traffic distribution based on CTM The method can quantitatively evaluate the effect of traffic organization scheme under emergencies.