Study On Safety Risk Assessment Of Deep Foundation

With the accelerated process of urbanization in China,land planning optimization and upgrading,underground space development and utilization has become the mainstream to solve the problem of urban construction land shortage.Underground works are moving towards"building large-scale","deep-seated" and "surrounding environment".However,the construction of deep foundation pit is characterized by "quantity,structure,scale,difficulty" and so on.In addition,the formation of complex,soil uncertainty,complex construction environment,construction safety management level is low,leading to deep foundation pit construction safety accidents often occur.Deep foundation pit construction safety accidents cause huge economic losses and casualties to the country and society.Therefore,the risk assessment model of deep foundation pit is taken as the research object,the construction process of deep foundation pit is analyzed,the risk of construction safety accident is discussed,and the key factors causing safety hazard are found.The quantitative risk assessment model of deep foundation pit construction is established,Predicting the security risk has great theoretical value and practical value,and the countermeasures and measures are put forward.Has been editedFirst of all,this paper discusses the current situation of deep foundation pit engineering research at home and abroad,and according to the relevant research results were compared to determine the deep foundation pit engineering and safety risk concept.Through the theory of deep foundation pit engineering,safety risk management theory and comprehensive evaluation theory analysis.According to the design principle of the comprehensive evaluation index system,the construction process and characteristics of the deep foundation pit engineering are clarified,and the possible risk factors of deep foundation pit construction are identified and classified by WBS-RBS risk identification method.Technical risk,management risk and environmental risk.In this paper,the data of the survey data are analyzed by mathematical method,and 28 key factors for safety accidents in deep foundation pit construction are identified and extracted.Put forward the establishment of evaluation index system and evaluation criteria of the key factors.Secondly,the construction process of safety risk assessment model for deep foundation pit construction is studied.According to the limitation and feasibility of the traditional assessment method,the construction safety risk assessment model is established by using the fuzzy matter-element analysis method in the background of the establishment of the safety risk assessment index system for the deep foundation pit engineering construction.At the same time,through the analysis of the analytic hierarchy process to determine the lack of weight,the introduction of entropy weight method to integrate,to overcome the hierarchical analysis process to determine the subjectivity.In addition,the fuzzy matter-element analysis method can effectively deal with the fuzzy problem,quantify the qualitative problem,intuitively and reliably analyze the result.Finally,this paper uses the case evaluation method to analyze the project of Hang Lung City Hall Square,introduces the general situation of Hang Lung Town Hall Square project,uses the research ideas put forward in this paper to calculate the weight of risk factors,and calculates the construction safety level of project deep foundation pit The The results show that the risk assessment results are compared with the safety risks encountered in the actual construction of the foundation pit to verify the designThe quantitative evaluation of the safety risk assessment model of the foundation pit project can realize the quantitative evaluation of the key risk factors of the construction safety risk control,and provide the theoretical support for the decision-making to provide theoretical support.