公交接驳场景下轨道交通网络脆弱性研究

Vulnerability research of rail transit network under bus connection scenarios

为准确地评估突发事件下轨道交通网络的脆弱性,提高网络抵抗风险的能力,在轨道交通拓扑脆弱性研究的基础上,考虑网络中实际的客流以及站点失效情景下公交对客流的接驳作用,基于用户的平均出行时间损失构建脆弱性评估模型,以上海市地铁网络为例,识别出网络中的关键站点,同时,分析不同公交接驳效率对轨道交通网络脆弱性的影响。研究结果表明:在公交接驳场景下,轨道交通网络中时间加权度和客流介数中心性较高的站点一旦失效,对用户造成的平均出行时间损失较大;此外,公交接驳效率越高,轨道交通网络的脆弱性越低,当公交接驳效率高于0.4时,对用户造成的平均出行时间损失可降低到5%以下。

In order to evaluate vulnerability of rail transit network in emergencies accurately and improve ability of resisting network risks,based on research of rail transit topology vulnerability,actual passenger flow in network and connecting effect of public transport on passenger flow under scenario of station failure was consided,a vulnerability assessment model was constructed based on average travel time loss of passengers,taking Shanghai Metro network as an example. At the same time,vulnerability of rail transit network under different bus connection efficiency was analyzed. The results show that under bus connection scenarios,stations with high time weighted degree and passengers weighted betweenness will cause more average travel time loss once these stations failed. In the actual emergency connection management,priority should be given to these stations. In addition,the higher the bus connection efficiency is,the lower the vulnerability of rail transit network will be. When connection efficiency is higher than 0. 4,the average travel time loss of passengers can be reduced to less than 5%.