Analysis Of Cascading Failure Propagation Mechanism In Comprehensive In Comprehensive Transportation Infrastructure Network

As one of the most important components of critical infrastructure,transportation infrastructure is responsible for the transportation service function of the entire society.With the continuous construction and development of transportation infrastructure,our country has formed an comprehensive transportation network extending in all directions,at the same time the transportation infrastructure also faces many risks.There is a complex correlation between the various transportation modes infrastructure,and the failure of any transportation mode transportation infrastructure may affect the normal operation of its own network and associated network.Analyze the correlation between transportation infrastructure and its mechanism,study the loss of network infrastructure failure network,classify the traffic infrastructure,identify the high-risk infrastructure in the transportation infrastructure network has important practical significance for the operation and maintenance of the transportation infrastructure.Firstly,from the perspective of infrastructure relevance,this paper determines the type and characteristics of the relationship between transportation infrastructures;analyzes the relevance of transportation infrastructure from the perspectives of structural association,geographic association and physical association.And uses the complex network related theory to propose the structural correlation degree and structural importance calculation model of the infrastructure.Analysis the mechanism of geographic infrastructure association and physical association risk propagation of traffic infrastructure.Secondly,it analyzes the risk factors of traffic infrastructure and the failure probability of the traffic infrastructure network under natural disasters.Using traditional network correlation theory to improve the initial load,capacity limit and load redistribution mechanism of nodes and edges in the network based on the traditional cascade failure model.Finally,taking Chengdu urban agglomeration as an example,analyzing the risk probability of traffic infrastructure network under earthquake disaster,using Matlab software to simulate and analyze the cascading loss of Chengdu urban agglomeration transportation infrastructure network,determine the cascading loss of traffic infrastructure network,calculate the traffic infrastructure risk values of Chengdu City Group,classify the risks,and identify the most risky sites and sections in the transportation infrastructure network under earthquake disasters.The research results can be Provide decision-making basis for relevant departments of transportation infrastructure management.