Research On Construction And Application Of Urban Metro Network Vulnerability Assessment Model Considering Site Interaction

With the rapid increase in urban population and the development of social economy,the subway has gradually become the lifeline of urban transport system.However,the urban rail transit system is susceptible to earthquakes,floods,fires and other devastating accidents,and its recovery process requires a lot of manpower and material resources.Therefore,it is very important to analyze the impact of emergencies on the subway network and to study the vulnerability and robustness of different subway network structure types in the face of external attacks.A new subway network vulnerability evaluation model is constructed on the basis of existing research by using the method of graph theory and complex network theory,introducing the vulnerability index of daily accessibility and considering the mutual influence between sites.Using Matlab to simulate the attack process of emergent events,the differences between the two evaluation models can be found by comparing with the existing research.Finally,combining the star,radio,grid,radio with ring,grid with ring five typical subway network types,the vulnerability is contrasted to find the more robust subway network structure type in the face of random attack and deliberate attack and provide a reference for the security planning and management of subway network.The results show that the improved subway network vulnerability evaluation model is more practical;subway networks show a strong vulnerability to deliberate attacks on node betweenness;different types of subway networks exhibit different vulnerabilities.