Evacuation And Risk Analysis Of Metro Station Construction Workers Based On BIM Technology

Metro stations are mostly located at urban road intersections.However,the number of underground pipelines at urban road intersections is large and criss-crossing,and there are often complex buildings nearby.These characteristics determine that the subway station construction process has a relatively high security risk.Therefore,carrying out the research on the identification of risk factors,the prediction of risks and the evacuation of construction workers after the emergence of urban subway has important theoretical and engineering significance.Based on this background and purpose,the dissertation,supported by the National Natural Science Foundation of China(51308355),takes the risk identification and prediction of subway station construction as the research object and conducts a series of researches.Firstly,based on Bayesian network,various risk factors of metro station construction are identified and analyzed.Secondly,BIM related software is used to build the subway station model.Finally,we further simulate the evacuation of construction workers after the occurrence of the risk.The specific research contents and work results are as follows:1.Based on the construction procedure of metro station cover-dredging method,the status quo of risk analysis of subway construction at home and abroad,the research status of BIM at home and abroad and the development of safety evacuation theory are summarized,and the development trend and existing problems of relevant theoretical research are summarized,Is the basis for subject selection.2.Identify the construction risks of metro stations and summarize the six major construction categories of metro stations and their respective risk factors;obtain the initial prior probability of each risk factor by means of questionnaire survey,and then calculate the posterior probability.Based on the characteristics of construction risk,risk reasoning and checking of subway stations are carried out based on Bayesian network's diagnostic reasoning,causal reasoning and sensitivity analysis,and finally the probability of construction risk of subway stations is obtained and the most sensitive risk factors are calculated.The method of identifying risk factors with the reasoning method,the feasibility of Bayesian network in risk assessment of metro station construction is verified.At the same time,the influence of other risk factors on the other factors is studied.3.Summarize the basic theory of BIM technology,analyze the traditional technology,analyze the existing problems and causes;and analyze the advantages and the value of BIM technology.Afterwards,Revit software was used to construct the subway station building model and extract the engineering quantity of the model.The detailed structure and schedule were introduced and the subway station construction organization plan was compiled according to the actual project conditions.Based on the above contents,the 4D model of subway station construction is constructed to simulate the station construction process and provide the model foundation for evacuation simulation.4.Based on the BIM technology,a multi-agent evacuation simulation system is proposed,and a real construction dynamic scenario is established by using BIM technology.The model foundation is built for the evacuation of labors on construction site,and evacuation simulation is combined with evacuation simulation Simulation analysis.Taking the construction 4D model of metro station construction as the research object,the Bayesian network is used to calculate and reason the result.The simulation of the evacuation of labors in different construction scenes is carried out by using Pathfinder evacuation simulation software.From the perspective of evacuation safety,The progress and construction layout are optimized in two aspects,providing reference and suggestions for construction safety management.