Analysis And Research On Risk Evolution Of Metro Shield Construction Based On Complex Network Model

In recent years,the process of modernization in my country has been changing with each passing day.Under the impetus of the wave of informatization,the subway is an efficient and convenient modern transportation tool because of its high safety,large passenger capacity,high punctuality,and fast driving speed.In the process of modernization and upgrading of transportation modes in our country,rapid development has been achieved,and it has also effectively alleviated the pressure of urban travel.In this context,the safety of subway construction is particularly important.Because the construction work surface is underground,the observation of the construction environment is not intuitive and concealed.The process of shield construction often has great dynamic changes.Due to the complex environment of underground accidents,a variety of risk combinations and connections often lead to large-scale accidents.The causes and results of accidents are often very complicated.The current analysis of the causes of some subway shield accidents does not fully consider the internal evolution mechanism of construction risks,and the occurrence of underground engineering accidents often brings serious economic losses.Therefore,this article makes a systematic analysis of the causes of subway shield construction and accidents,takes the rules and connectivity of the internal risks of the system as the main object of research,and explores the mutual conduction and evolution of various risks in subway shield construction accidents.,And through the risk impact relationship and importance evaluation,trace the key links of the accident,block its internal evolutionary cause chain,and adopt effective methods to reduce the occurrence of subway shield construction accidents,which is of positive research significance.of.Not only that,it also provides new ideas for existing research and supplements risk management programs.This article mainly collects the domestic and foreign subway shield construction accidents in recent decades.With the help of official disclosure or published accident cause investigation reports,the risk point system is established based on the disclosure of accident content and the analysis of the cause of the accident.With the help of the relevant theories of complex networks,the established system is modeled and studied,its internal evolution relationship is explained,the risk evolution mechanism is clarified,and immune measures are proposed.The main research contents are as follows:(1)Through reference,starting from the collected data of 125 subway shield construction accidents,according to accident data analysis,according to the sequence of the occurrence time of risk points and the causal relationship,the accident chain is extracted from it,and the accident risk point system is established to reveal The evolution mechanism between the related risk points in the accident during the subway shield construction.(2)Use complex network theory to model and simulate the evolution of risks,and use the network model to show the relationship between the risks in the accident and the mutual evolution of the accident.Grasp the overall characteristics of the network through the network’s topological characteristic indicators.In this paper,risk points are regarded as the most basic unit in a complex network—nodes;and nodes are connected by unidirectional connected edges,which represent the relationship between risk points.(3)Based on this,a risk evolution model for subway shield construction accidents is established.With the help of a complex network,the relationship of the system can be expressed,and the characteristics of the system function can be studied by analyzing the system structure.In this paper,risk points are regarded as nodes,and the relationship between risk points is edges.The network is composed of 64 nodes and 323 directed weighted edges.By analyzing multiple representative characteristic indicators of the network model,it is verified that the subway shield construction accident risk evolution model has relevant network characteristics,conforms to the characteristics of complex networks,and can reflect the dynamics of risk evolution to a certain extent.(4)Analyze the internal evolution mechanism of risks in accidents,have a deep understanding of the spread and causality of risks in the system,and have a clearer understanding of causality.Due to the need to propose feasible risk control methods,the importance of risk points to the network was simulated,and the importance of risk points was evaluated through different node attack logic,and a more efficient network reduction plan was proposed.The risk avoidance and management put forward constructive suggestions to improve the research system of subway shield construction accidents.