Research Of Construction Safety Risk Assessment Of Urban Underground Utility Tunnel

Compared with the general surface engineering construction safety risk management,the urban underground utility tunnel construction process is faced with more uncertain factors,which also leads to more construction safety accidents.At present,there are few theoretical researches and engineering practices on the construction safety risk of urban underground utility tunnel,and most of them are based on the existing construction safety risk methods of urban underground engineering,and lack of pertinence,especially the lack of the construction safety risk evaluation system of urban underground utility tunnel,which can not effectively identify and predict the risks and construction of urban underground utility tunnel The risk degree of consequences leads to insufficient prevention and control of construction safety risks of urban underground utility tunnel.First of all,according to the collection and analysis of the construction safety accident cases of the urban underground utility tunnel,as well as the description of the construction safety accident of the urban underground utility tunnel in the existing literature,the thesis summarizes the construction safety accident characteristics of the urban underground utility tunnel.On the basis of determining the construction safety risk range of the urban underground utility tunnel,the thesis analyzes the construction safety risk of the urban underground utility tunnel with the methods of literature analysis and expert consultation,and constructs the construction safety risk list of the urban underground utility tunnel,including the construction safety risk of the foundation pit project of the urban underground utility tunnel,the lifting and assembling construction safety wind of the urban underground utility tunnel Risk,urban underground utility tunnel mechanical and electrical engineering construction safety risks in three aspects.Secondly,based on the analysis of common risk assessment methods,combined with the purpose of construction safety risk assessment of urban underground utility tunnel,the thesis describes the construction safety risk assessment model of urban underground utility tunnel,and determines the construction safety risk assessment model of urban underground utility tunnel to solve the problem.Based on the identification results of the construction safety risk of the urban underground utility tunnel,the evaluation index system of the construction safety risk of the urban underground utility tunnel is established;the estimation method of the consequence severity of the construction safety risk of the urban underground utility tunnel,the estimation method of the occurrence probability of the construction safety risk of the urban underground utility tunnel and the hazard degree of the construction safety risk of the urban underground utility tunnel are determined Evaluation methods.Finally,three engineering examples are selected to test the construction safety risk evaluation index system of the foundation pit engineering of the urban underground utility tunnel,the hoisting and assembling construction safety risk evaluation index system of the urban underground utility tunnel,and the construction safety risk evaluation index system of the mechanical and electrical engineering of the urban underground utility tunnel.The significance of the research on the construction safety risk assessment of urban underground utility tunnel is that it is expected to supplement the deficiencies in the current construction safety risk management of urban underground utility tunnel and enrich the construction safety risk assessment methods of urban underground utility tunnel.The construction safety risk assessment model of urban underground utility tunnel can provide a scientific and reasonable decision-making method for the construction safety management of urban underground utility tunnel.Through the construction safety risk assessment and control of urban underground utility tunnel,the possibility of safety accidents and the loss of accident consequences can be reduced,so as to ensure the construction safety and management objectives of urban underground utility tunnel.