高饱和度路段上下游交叉口间相位差优化模型

Offset Optimization Model Between Upstream and Downstream Intersections of High Saturation Road

高饱和度路段常出现周期性长距离排队的现象,针对现有路段上下游交叉口相位差优化方法存在的不足,首先对多股车流汇入情形下的路段排队演变进行分析,利用冲击波理论建立排队长度模型和延误模型;其次定义排队影响权重用于表示不同情形下排队长度的影响程度,建立了以上下行加权排队总长最小为主目标、总延误最小为次目标的相位差序贯优化流程;最后利用VISSIM仿真对比文中模型与最小延误模型所得相位差方案的优劣。结果表明,在各汇入车流间流量差较大时,文中模型所得方案以车均延误小幅上升换取了上下行最大排队总长且平均停车次数显著下降,从而验证了文中所建模型的有效性与实用性。

The phenomenon of periodic long queues often exists in the link with high saturation,and aiming at the shortcomings of the existing coordinated control methods for the upstream and downstream intersections of the road.Firstly,the queuing evolution of the link with multi traffic flows is analyzed,and the queuing length model and delay model is created on shock wave theory.After that the queue weight is defined in order to indicate the influence of queue length under different conditions,and this paper establish a sequential optimization process to solve the optimal offset,of which the minimum total queue length is the main objective and the minimum total delay is the secondary objective.Finally,a comparison is made between this model and the minimum delay model by VISSIM.The outcomes reveal that,with the scheme of this model,the maximum queue length and the average number of stops decreased significantly with the slight increase of average delay,and by which the validity and practicability of the model are verified.