基于复杂网络理论的轨道交通网络脆弱性分析

城市轨道交通是城市客运体系的重要支撑,而突发事件易使某些轨道交通站点瘫痪,从而影响轨道交通网络全局效率。分析城市交通轨道网络的拓扑特征和脆弱性对于优化路网结构、保障稳定运营有重要意义。以重庆市轨道交通网络为例,使用Space L法构建拓扑网络并用Matlab软件分析节点度、平均路径长度、聚类系数等指标和分布规律,定量计算各个站点对于蓄意攻击的脆弱性,以鉴定对网络效率影响最大的关键站点。模拟攻击实验结果表明:现阶段重庆市轨道交通网络平均路径长度较大,聚集系数较小,网络连通性有待提高。面对蓄意攻击时,红旗河沟站和大坪站作为关键节点对网络效率的影响较大。在加快重庆市轨道交通建设的同时,应在运营中加强保护关键站点。

Vulnerability Analysis of Rail Transit Based on Complex Network Theory

Urban rail transit is the key component of urban transit system,but emergencies disrupt operation of rail transit stations and influence transit network efficiency.For ensuring stable operation of urban rail transit,analyzing its topology characteristics and vulnerability is of great importance.Chongqing rail transit network was taken as an example,topology of it was made by space L method,and the value of the degree of the network,average shortest length and clustering coefficient were then computed and analyzed.At last,vulnerabilities of every station under intentional attack were computed and critical stations which influence the network efficiency most were found.Results of simulation experiment show that average shortest length of Chongqing rail transit network is quite large and clustering coefficient of it is small,thus connectivity of it should be improved.The network efficiency of the network is suffered more under intentional attack.Hongqihegou station and Daping station are the most critical components and the protection of them needs to be enhanced in operation especially.