Research On Network Model And Risk Factors Propagation Of Collapse Risk Factors In Traffic Tunnel Construction

Tunnel engineering is an important part of transportation infrastructure construction,and collapse is a typical accident in the process of tunnel construction.Once it occurs,it will cause huge loss of life and assets of on-site personnel.Therefore,in-depth research on the risk factors of traffic tunnel construction collapse is carried out in order to provide a reference for the prevention and control of tunnel collapse accidents.This thesis organizes the collected 96 accident cases,and uses rooting theory to encode the original data to determine the five categories of people,environment,design,management and engineering structures and construction measures,3 3 risk factors were included.Based on the case analysis method and event chain analysis method,302 non-repeated risk factor chains are extracted.The risk factor chain is integrated into a global network,that is,the risk factor network of the collapse of the traffic tunnel construction.By analyzing the importance of the network through the characteristics of the risk factors of the traffic tunnel construction,the importance of the network structure,extract key risk factors,and analyze the connection and evolution of the network from the small world effects and bidding non-bidding characteristics.Combined with the characteristics of traffic tunnel construction collapse risk,the disaster spread model was improved.On the basis of the constructed risk factor network,the risk factor spread process was analyzed from three aspects:the difference of node importance,the change of risk threshold and the change of initial risk amount.Simulation and analysis of risk factor propagation laws.Combined with the network analysis results in Chapter 4,risk control countermeasures are proposed from three aspects:paying attention to key risk factors,controlling the state of risk factors and improving the tunnel’s own stability maintenance capability.This thesis studied the risk factors of collapses in the process of traffic tunnel construction,carried out risk factor analysis,studied the causal relationship between risk factors and the propagation law of risk factors,and proposes targeted strategies to provided guidance for the prevention and control of collapse accidents in tunnel construction.