Study On Safety Risk Evaluation Of Urban Deep Foundation Pit Construction Based On Set Pair Analysis

In recent years,China has accelerated the process of urbanization,urban construction is in full swing,land planning is optimized and upgraded,and the development and utilization of underground space has become an effective way to solve the shortage of urban construction land.Deep foundation pit engineering as the basis of the numerous construction projects,the security situation in restricted by such as geology,environment,construction technology,construction of deep foundation pit safety accidents occur frequently in the process,the construction process of high-risk sexual makes the project risk management has been a necessary research subject,in order to improve risk control ability,to the construction safety risk assessment of urban deep foundation pit construction,the analysis of risk factors and risk control and prevention measures are put forward in order to improve the safety of foundation pit ontology.This paper takes the construction safety risk of urban deep foundation pit as the research object,extracts the key safety risk factors with the help of WBS-RBS coupling matrix according to the "4M1E" principle through the field investigation and application of accident cause theory,and establishes the evaluation index system of safety risk of urban deep foundation pit construction with 28 specific indexes.After comparison and analysis of traditional risk assessment method based on set pair analysis theory,"the same and different" idea of quaternary comprehensive evaluation model,fuzzy connection number to determine evaluation index weights,the traditional grey correlation method,the entropy weight method is optimized to improve,and with the help of MATLAB program to get the weight of the result of calculation is more accurate and reasonable.Then,based on the linear weighting principle,the proportion of the two weighting methods is divided equally,and the final comprehensive weight value of each index is calculated,which guarantees the scientificity and rationality of index weighting.Finally,the comprehensive evaluation mathematical model established in this paper is used to analyze the case of a deep foundation pit project of a building in Shenzhen city.According to the risk information shown in the evaluation results,the corresponding risk control and prevention measures are put forward.Research results show that the risk index system,and established in this paper,the improved comprehensive evaluation mathematical model can be a reasonable project risk level,at the same time the research content of this article expands the set pair analysis theory of application fields,for the foundation pit engineering construction safety risk assessment provides a theoretical method,also has certain reference for the similar risk assessment.