Study On Safety Early Warning Of Collapse Accident In Subway Construction

The state has given great support to urban subway construction in terms of policy and funding.However,the number of construction accidents in urban subway construction is high,and the security situation is far from optimistic.Through the analysis of the accident case database collected by the team,it is found that the collapse accident is the most important dangerous source of subway construction.Therefore,the subway collapse accident is focused on and the measures to prevent and control the collapse process of subway construction is mainly discussed.After determining the collapse of the subway as a research object,the accident-induced stratification model is used to analyze the mechanism of a subway construction collapse accident,and the foundation is laid for the next step to extract the precursor information of the collapse accident from the accident case.Precursory information is now being used more and more for security risk management.previous research experience is draw on,and using the construction site precursor information and the precursors and immediate contributory factors investigation model,the precursor information is identified from the subway construction collapse accident in the past 14 years.It is necessary to monitor the observed information of the precursor information for early warning which is based on the precursor information.Therefore,the acquisition methods of several real-time monitoring information is analyzed in detail,and the precursor information monitoring data for the early warning is provided.According to the different safety status of the construction site for the classification of early warning,respectively on single-index warning and multi-index integrated early warning mode,established a different early warning mechanism.Taking the 68 monitoring data of a subway construction site as an example,the forecasting accuracy is 87.5%,and the good warning effect is achieved.In the end,the construction of the early warning system of subway construction collapse accident is completed.On this basis,taking the underground pit project of a subway station in Nanjing as an example,Visual Studio is used to develop the secondary software of GIS software.Based on the predicting model of collapsing accident,the visualization of early warning system is realized.