Safety Risk Identification And Assessment Of Subway Station Construction Based On BIM

China's economy has shifted from the stage of high-speed growth to the stage of highquality development,with the city scope gradually expanding and the underground space continuously being developed and utilized,the subway construction has become an important work in China's infrastructure industry,which can relieve the over ground traffic pressure and improve the urban traffic.However,the surrounding environment of the subway station is complex,and there are extremely complex risks in the construction process,which can easily lead to safety accidents,such as ground subsidence,foundation pit collapse,enclosure structure instability,foundation pit bottom shifting sand and soil,etc.,causing people's lives and property safety to be infringed upon.Only scientific and reasonable risk management can ensure safe construction,thus contributing to the construction of urban infrastructure.Therefore,this paper constructs the knowledge base and safety evaluation index system of subway station construction safety risk with the open-cut method,so as to realize the standardization and standardized management of subway station construction safety.Use of commonly used project decomposition tool-the work breakdown structure(WBS)analysis and decomposition method for subway construction activity,identification of risk factors,after building the subway station construction safety evaluation index system,index system of diversity index,there are some difficult to give a specific numerical indicators,so you can use cloud model to fuzzy definition of the index level,make the evaluation more close to reality,and combining with the matter-element extension method and build a safety assessment method based on extension cloud model.Order relation analysis of the methods and the combination of the entropy weight method to calculate weight comprehensive,repeated many times with the aid of MATLAB programming calculation,the calculation standard of each index and its corresponding level correlation between cloud and safety grade level,effectively reflect the actual problem of fuzziness and randomness,the evaluation results more accurate and intuitive.Based on SQL Server to build a safety risk knowledge base,structured storage of risk knowledge,and follow-up secondary development of Revit API to realize the identification of station construction safety risks in the BIM environment,and put forward improvement measures to effectively improve station construction safety levels.