Research And Application Of Risk Evaluation Method For Construction Of Underground Tunnel In Urban Road

In the construction of urban road underpass tunnel as the engineering background,according to the evaluation method of risk evaluation and application of complex reality,the lack of data,limited qualitative and quantitative analysis,the calculation accuracy is insufficient,the problem is difficult to determine the index weight,Introducing Catastrophe Theory and BIM,it researches the method of urban road underpass tunnel construction risk.In the construction of urban road underpass tunnel,the development and utilization of the general construction cycle is long,the cost is relatively high,after the completion of the renovation or rebuilding the possibility of relatively small,so the development and utilization of the underground space in a multidisciplinary,cautious decision-making at the same time,we must have a complete,scientific,risk assessment methods of river support so,this paper focuses on the research of wear construction risk evaluation method of urban road underpass tunnel,the main research contents and results are as follows:(1)Study on the basic theory of risk evaluation for urban road underpass tunnel construction.This paper based on the current research of relevant theories at home and abroad.First of all,the definition,characteristics and common risk evaluation of the risk evaluation for urban road underpass tunnel construction are defined.In detail,the framework of the risk evaluation theory on the urban road underpass tunnel construction is combed.The framework consists of two parts: first,the risk management foundation based on the content and method of risk identification,the necessity analysis of risk evaluation;The basis of risk Management in urban road underpass tunnel construction based on Three-Dimensional risk Evaluation method,the comparison of different risk Evaluation methods.In this paper,it can be seen from the relevant literature that the research on risk evaluation has gradually changed from the exploration of basic economics to the concrete study of risk analysis methods or means both at home and abroad.On the basis of previous studies,this paper systematically and deeply discusses the risk evaluation and application of urban underpass tunnel construction.(2)Risk evaluation model of urban road underpass tunnel construction.From the perspective of comprehensive risk,the risk evaluation index is further refined,as well as several ways of risk evaluation standard,according to the relevant principles and methods,a more comprehensive and specific risk evaluation index system is put forward,and the risk evaluation index system is constructed and perfected.Multi-level risk evaluation model based on catastrophe theory.The model overcomes the problems of complex application,lack of data,limited qualitative and quantitative analysis,insufficient precision,difficult to determine index weight,etc.This paper makes a holistic evaluation of the risk of the passage under the urban road,which brings new ideas to the risk evaluation,and improves the scientific and accuracy of the risk evaluation.(3)Application of risk evaluation model in urban road underpass tunnel construction in engineering example.First of all,the general situation of engineering geology,hydrogeology and surrounding environment is analyzed in detail.The selected projects have the risk characteristics of the surrounding high-rise buildings,the control of underground water during the construction process,the surface roads around the project,and so on.The risk factors are technical,environmental,artificial and uncertain.In order to carry out risk evaluation objectively,a comprehensive,scientific and reasonable risk evaluation model must be constructed.The risk evaluation model based on catastrophe theory is a qualitative and quantitative evaluation method.It can be used in the construction of t urban road underpass tunnel,and it can be used to evaluate the construction risk of engineering cases easily.Based on the fuzzy analytic hierarchy process and the obtained results,the results tend to be more scientific and practical.(4)Application of BIM technology in risk evaluation.The application of stage BIM in risk evaluation is less,the basic theory research is more,and the engineering application is less and shallower.Based on the analysis of the application value of BIM in risk evaluation,this paper establishes the BIM model of engineering cases,and selects the more complicated parts or processes of construction.The 7 construction conditions are simulated dynamically,and the earth pressure and displacement are obtained.The bending moment,shear force and surface settlement are analyzed,which provides a scientific reference for the risk evaluation of the project.