Research On Causes And Treatment Measures Of Uplift Failure In Basement Construction

With the acceleration of urbanization,urban space is becoming more and more limited.The expansion of underground space has become an inevitable trend in the development of modern society.However,the development and utilization of underground space will inevitably encounter structural anti-floating problems,which will seriously affect the safety,applicability and durability of the building structure.Most of the existing researches are based on the qualitative description of anti-floating related concepts and theories.The research on the safety hazard feed-forward signal in the basement construction site is not paid enough attention,and the prediction accuracy of the safety risk is far from satisfactory.There is still a big gap between the forecasting requirements.Therefore,the research goal of this dissertation is to search the feed-forward signal of the hazard source of the basement floating accident from the perspective of the feed-forward signal of the basement floating accident,and to design a method for real-time monitoring of the hazard source and real-time prediction of the risk.(1)Literature review,research ideas and technical route.Based on the detailed literature review,the status quo and direction of the incidents of basement floating accidents are analyzed,and the current research deficiencies are pointed out.Further clarify the research objectives and methods,and design research ideas.(2)Explain the theory and methods.Through literature review,master the basic theory of basement floating accidents,accidental cause theory and system dynamics theory,and elaborate the theory and application around the research direction of basement floating accidents,and provide theoretical basis for the later PaICFs model construction.(3)Analyze the cause of the accident in the basement.From the perspective of system dynamics,the causal factors of the occurrence of basement floating accidents were discussed.The system simulation study of basement floating accidents was conducted using Vensim.We can understand that the cross-coupling of various unsafe behaviors that affect the stability of the buoyancy in the basement caused by the basement floating accident caused the buoyancy stability of the basement to drop to the safety warning value.(4)Construction of accident feed-forward signal and attempted failure investigation model.Based on the PaICFs model,a survey questionnaire was designed to obtain the degree of recognition of the feedforward signal obtained by the project manager of the domestic construction unit.From the statistical results of the questionnaire,the availability and effectiveness of the feedforward signal obtained by the PaICFs model are mostly The project manager gave more positive comments.In addition,the degree of internal consistency between the questionnaire participants was further measured.The Kappa statistic of "multiple options,multiple scorers" was used to measure whether the questionnaire results were affected by chance.The final average weight Kappa value indicates that the project manager's internal consistency is moderate.Moreover,from the final average positive consistency index and the final average negative consistency index,the average positive consistency index is significantly higher thanthe average negative consistency index,indicating that the inconsistency mainly comes from the negative evaluation.(5)case analysis.The specific case accidents were analyzed.Firstly,on the basis of the accidents,the direct cause of the accidents was analyzed.Then,according to the routine treatment methods of the basement floating accidents,the treatment method that was most suitable for the accident was selected.Based on the analysis of the cause of the accident,the feedforward signal and the attempted event of the cause of the accident are analyzed.The feedforward signal and the failed event will be obtained from the near PaICFs database.