Research on Safety Risk of Operation and Maintenance of Urban Underground Utility Tunnel Based on Fault Tree and Fuzzy Bayesian Network

Urban underground utility tunnel plays a vital role in the process of urban development. It is the lifeline of the city. Once an accident occurs, it will cause great losses to the society. However, accidents occur occasionally in the process of operation and maintenance. In order to better carry out operation and maintenance management, this paper constructs a risk assessment model of urban underground utility tunnel operation and maintenance based on fault tree and fuzzy Bayesian network. Based on the comprehensive consideration of the risk factors of the pipe gallery, the fault tree model is constructed and mapped into a Bayesian network. Based on this, the fuzzy thought is introduced into Bayesian theory, and the actual case is analyzed. The results show that the method can effectively evaluate the operation and maintenance risk of utility tunnel and meet the needs of practical work.