Study On Safety Resilience Evaluation And Improvement Strategy Of Railway Tunnel Construction In Complex And Dangerous Areas

Tunnel construction in complex and dangerous areas involves many natural factors and social system control problems,safety management during the construction period will face great challenges,in the prevention and response to various natural disasters,accidents and disasters and other aspects of the situation is very serious.In order to improve the safety risk management level of tunnel construction in complex and difficult mountain areas,it is urgent to further develop the applicable safety risk assessment technology during construction according to the characteristics of the project,so as to improve the overall level of construction safety.This paper is based on the national key research and development plan "Risk Identification and Comprehensive Prevention and Control Technology of Ultra-large Railway Construction in Complex and Dangerous Areas" Project 3 "Research on Major Safety Risk Warning and Prevention Technology of Ultra-large Railway Construction in Complex and Dangerous Areas(2021YFB2301803)".In view of the sudden,complexity and unpredictability of tunnel construction risks in complex and dangerous areas,this thesis integrates the resilience theory focusing on prior management into the tunnel construction safety assessment work,analyzes and explores the application of safety resilience in tunnel construction system,and provides new ideas for tunnel construction safety assessment.The main conclusions are as follows:(1)Defined the connotation of railway tunnel construction safety resilience in complex and dangerous areas,constructed the concept curve of tunnel construction safety resilience,and analyzed the change law of the whole process of tunnel resilience.According to the different resilience characteristics of tunnel in different stages after disturbance,four resilience characteristics including absorption capacity,adaptation capacity,recovery capacity and lifting capacity were summarized.(2)Through the literature measurement method and combined with the construction characteristics of tunnel engineering in complex and difficult areas,the index suitable for the evaluation of railway tunnel construction safety and resilience in complex and difficult areas was summarized,and the final index was determined according to the questionnaire survey,validity(KMO value is greater than 0.7)and reliability(α0.817(29)=0.8).A tunnel construction safety resilience evaluation system is constructed,which takes the characteristic elements of resilience as the first-level index and 29 resilience index factors as the second-level index,and the indexes are described.(3)If AHP-entropy weight was used to assign the index combination weight,and TOPSIS method was improved based on the obstacle degree model to construct the tunnel construction safety resilience evaluation model.Combined with a railway tunnel engineering example,it is obtained that five construction sections of the tunnel are grade Ⅲ,grade Ⅱ,grade Ⅱ,grade Ⅱ,grade Ⅱ,grade Ⅱ,and the resilience level is low.The obstacle indexes that have great influence on tunnel resilience include tunnel surrounding rock grade,mechanical equipment safety state performance,personnel safety literacy,field safety protection command,emergency plan response implementation,etc.The calculated results are in line with the engineering practice.(4)In combination with the basic theory and working principle of blockchain,a tunnel construction safety and resilience improvement system based on blockchain is proposed.Based on the evaluation results of actual projects,organizational system management guarantee strategy,equipment information resource management guarantee strategy,construction environment monitoring protection guarantee strategy and safety management mechanism guarantee strategy are proposed.