考虑非机动车流影响的微循环路网组织优化

Organization Optimization of Microcirculation Road Network Considering Influence of Non-motor Vehicle Flow

为提高道路网通行能力,缓解干道拥堵,提高支路利用率,研究了非机动车流对机动车流的影响,并构建了影响模型,对机动车流的路阻函数进行改进。使用改进后的路阻函数构建微循环路网单向交通组织双层规划模型。上层模型以路网交通效率最大,干道平均饱和度最小和微循环支路平均饱和度最小为目标;下层模型是基于用户平衡分配的交通流分配模型。采用遗传算法对模型进行求解。最后以北京市西三旗地区某微循环系统为例进行算例分析。结果表明:实施单向交通能够有效降低干道饱和度,提升支路利用率,平衡道路资源使用。在不考虑非机动车流影响时,进行单向交通组织的路段为9条,考虑单向交通影响时,进行单向交通组织的路段为4条,仅有两条路段重合,两种情况路网组织方案差异明显,所以应在实际路网优化时考虑非机动车流的影响。可见,考虑非机动车影响的微循环路网组织优化模型能够为实际单向交通组织提供理论支持。

In order to improve the traffic capacity of the road network,alleviate the congestion of the trunk road and improve the utilization rate of the branch road,the influence of non-motor vehicle flow on motor vehicle flow was studied,and the influence model was constructed to improve the road resistance function of motor vehicle flow.The improved road resistance function was used to construct a bi-level programming model of unidirectional traffic organization in microcirculation network.The objective of the upper model was to maximize the traffic efficiency of road network,minimize the mean saturation of trunk road and minimize the mean saturation of micro-circulation branch road.The lower layer model was a traffic flow allocation model based on user balanced allocation.Genetic algorithm was used to solve the model.Finally,a microcirculation system in Xisanqi area of Beijing was taken as an example.The results show that one-way traffic can effectively reduce arterial saturation,improve the utilization rate of branch roads and balance the use of road resources.When the influence of non-motor vehicle flow is not considered,there are nine sections for one-way traffic organization.When the influence of non-motor vehicle flow is considered,there are four sections for one-way traffic organization,and only two sections overlap.In both cases,there are obvious differences in road network organization schemes,so the influence of non-motor vehicle flow should be considered in the actual network optimization.Therefore,the microcirculation network organization optimization model considering the influence of non-motor vehicles can provide theoretical support for the actual one-way traffic organization.