Analysis of the influence of adding metro line 8 on the topology of Xi'an rail transit network

The topology structure of urban rail transit network is its basic property, based on complex network theory, this paper analyses the influence of metro line 8 on the existing rail transit network topology. This paper firstly constructs the network topology with or without metro line 8 by using space L method, and then makes a comparative analysis of index values and changing trends based on complex network indicators. It is concluded that the addition of metro line 8 can effectively improve network connectivity and improve network efficiency. This paper further analyses the stability of the network under unexpected events by simulating random and deliberate attack experiments, and the results show that the addition of metro line 8 can improve the stability and enhance the anti-risk ability of the network topology. Finally, this paper carries out shortest path matching on the OD data of weekday morning peak passenger flow, and compared the matching results, it is found that the addition of metro line 8 makes the traffic of some edges significantly increase or decrease, so the opening of metro line 8 can share part of the passenger flow of the original line and reduce the congestion in the morning peak.