Analysis And Evaluation Of Construction Risk Of Immersed Tunnel Based On SNA Method

With the rapid development of science and technology and inter-city traffic,and across the river in sea-crossing increasing infrastructure investment condition of the immersed tube tunnel geological conditions of strong adaptability,small buried depth,slope,operating conditions and comfortable,good waterproof performance,construction conditions and good adaptability to reduction of significant advantage has gradually become one of the main forms of underwater tunnel,so the immersed tube tunnel is more and more get the attention of the world,as a result,the project will get greater development in our country.However,with the rapid development of immersed tube tunnel,the risks in the construction have been paid more and more attention by the society.The whole construction process of immersed tube tunnel with difficult,complex technology,characteristics of hydrogeological environment variable,so there are a large number of risk factors in construction process,however,to carry out the relevant domestic engineering practice time late,the immersed tube tunnel construction risk management of related theory research and scientific immersed tube tunnel construction risk management practice is still relatively weak,with the engineering practice of immersed tube tunnel construction risk management is more and more high request does not adapt,It is of great theoretical significance and engineering practical value to carry out the research on the risk management theory of immersed tube tunnel construction,especially the theoretical research on the key technologies such as the tunnel construction risk assessment,so as to improve and enrich the risk analysis theory of immersed tube tunnel construction and improve the scientific level of the risk management and control of immersed tube tunnel construction.Firstly,this paper summarizes the current research status of immersed tube tunnel and the research status of social network analysis,and expounds the relevant concepts and theoretical basis.Secondly,based on the research of the related literature about the immersed tube tunnel and the integrated use of WBS-RBS risk identification model,immersed tube tunnel construction risk factors for the identification and summary of the immersed tube tunnel construction stage of risk factors,and to identify the risk factors and reliability analysis of description statistics,according to the analysis results show that conform to the requirements of the identification of risk factors.Again,based on the theory of social network analysis and so on,through to the immersed tube tunnel construction risk identification of risk factors for node,determine the relationship,the consistency analysis,and in the network of immersed tube tunnel construction risk,on the basis of overall analysis and individual analysis,obtained the immersed tube tunnel construction in the core and the key risk factors,and builds the immersed tube tunnel construction risk evaluation model;In this chapter,a method for risk management and control of immersed tunnel construction is proposed,and an index system is established to check and evaluate the effect of management and control.Finally,combining with the concrete immersed tube tunnel project as an example,using Ucinet6.645 carries on the empirical analysis,through the analysis of six core risk factors and key relationships,based on the research results,proposed for an immersed tube tunnel construction cycle of risk prevention countermeasures to the core of the control or reduce the happening of the risk factors,through the detection of risk control before and after,come to the conclusion that the complexity of the risk of an immersed tube tunnel network and risk factors of cohesive degrees were significantly decreased,the accessibility of a large number of risk factors is blocked.This paper studies the construction risk of immersed tube tunnel from the perspective of the relationship between risk factors,improves and enriches the traditional risk analysis theory of immersed tube tunnel construction,and provides a new way of thinking for the future research on the construction risk management of immersed tube tunnel project.