关键词: 城市轨道交通网络（URTN）, 复杂网络, 级联失效, 鲁棒性

Abstract: To explore the network characteristics of the urban rail transit network（URTN） and its robustness in the face of emergencies, as well as to improve operational efficiency, firstly, based on the theory of complex networks, the Space-L method is used to construct the URTN topology, and a comprehensive evaluation index for the importance of URTN sites is proposed. Secondly, the cascading failure model of URTN is established, and the cascading failure simulation algorithm is designed. The robustness of URTN cascading failure under different attack strategies is quantitatively analyzed by two robustness evaluation indexes of network efficiency and relative size of largest connected subgraph ratio. Finally, the paper takes the Shanghai rail transit network as an example to make an empirical analysis. The research results show that Shanghai rail transit network has the network characteristics of a small-world network and a scale-free network in the L space; regardless of whether there is a cascade failure, Shanghai rail transit network is more robust in the face of random attacks than a deliberate attack. In the case of cascading failure, rail transit networks that consider site load redistribution are more vulnerable; important site failures have a wider range of influence on the network, and the overall damage to the network is greater.

Key words: urban rail transit network（URTN）, complex network, cascading failure, robustness