基于OD需求的城市轨道交通网络扩张设计

Designing Urban Rail Transit Network Expansion for Optimal Origin-Destination Demand Capture

为了解决在已有部分轨道交通线路的基础上进一步网络扩张设计的问题,以最大化轨道交通网络能满足的起讫点(OD)需求为目标,建立了城市轨道交通网络扩张设计的整数规划模型,并提出了考虑乘客在扩张后的轨道交通网络中实际出行路径与交通方式间竞争的多项式Logit模型,以获得合理的轨道交通出行需求分担率.通过无锡市轨道交通规划案例验证了网络扩张设计模型的有效性与高效性,该模型能在不同预算下提供科学有效的网络扩张设计方案,并可用于分析新建线路间建设优先级以及区域交通发展潜力,为城市发展与用地规划提出建设性意见.此外,通过对Logit模型中的关键参数进行灵敏性分析,发现乘客越在意旅行时间和费用,轨道交通网络越能在较少的预算下满足更多需求,修建轨道交通的性价比越高.

Designing the urban rail transit network expansion over time for matching with urban development and emerging travel demand remains to be a crucial yet challenging task.A binary integer linear programming model was developed with the objective of maximizing the origin-destination demand capture under limited budget.In order to make the problem to be tractable,a modeling strategy was proposed.And the ratio of OD demand for urban rail transit was calculated by a multinomial Logit model,which considered not only mode competition,but also passengers’actual path in the expanded network.The linear programming model was applied to a real large-scale case in Wuxi,for validating its practicality and computing efficiency.The results demonstrate that satisfactory urban rail transit network design patterns with good connection between new lines and existing network can be obtained.Under tight budget conditions,those corridors and sections with higher priorities can also be identified.And a sensitively analysis indicates that passengers’concern about time and fares is conducive to the construction of the urban rail transit network.