基于重要度轨道交通初始线网生成技术——以合肥为例

Initial Rail Transit Network Generation Technique Based on Importance:A Case Study of Hefei City

针对现有轨道线网规划方法主要是以定性判断为主,对线网生成的定量研究不足,提出基于重要度理论的轨道交通初始线网生成技术,从"面、点、线"3个层面进行定量化描述。基于交通小区重要度确定轨道线网初始形态。以客流集散点覆盖最大化为目标,基于随机搜索法的轨道交通网络生成技术确定初始线网虚拟路径,结合最短路客流分配量调整初始线路实体路径,形成轨道交通路径。以合肥市轨道交通为案例进行实证研究,将初始生成的线网与合肥轨道规划的线网进行对比分析,2张网的吻合度为77.6%,表明基于重要度轨道交通初始线网生成技术是切实可行的。

The existing method of rail line network planning is based mainly on qualitative judgment. It lacks quan- titative studies of rail network generation. Therefore, this paper proposes a method of generating the initial rail transit network based on importance indicator system. The method gives quantitative description of a rail path from three aspects of plane, hub, and path. First of all, the paper determines the initial morphology of the rail transit network based on the importance indicator of traffic zones. Second, aiming at maximizing the coverage of passenger hubs, the paper determines the virtual paths in the initial network based on the random search method. Third, the paper adjusts the virtual paths and generates real paths according to the shortest path model. Finally, the paper uses a real rail transit in Hefei as a case for an empirical study. The similarity between the initial rail transit network and rail transit network of Hefei is up to 77. 6%. It shows that the method of generating the initial rail transit network based on importance indicator system is practical.