Research On Risk Assessment And Countermeasures Of Subway Tunnel Crossing Existing Lines By Mining Method

In recent years,with the expanding operation scale of subway line network in major cities and the intensive construction of new lines,more and more new subway tunnels inevitably go through the tunnels in operation.In all kinds of crossing engineering construction technology,the mine method construction crossing process has the greatest impact on the safety of the existing line operation capacity maintenance and the longest time span,which puts forward new requirements for the safety risk assessment and risk response strategy of metro engineering construction.On the basis of full investigation of relevant literature,combined with questionnaire survey method and expert consultation method,WSR system method and analytic hierarchy process were used to comprehensively analyze the risk of mining method subway tunnel crossing the existing subway line construction process,and a risk evaluation index system oriented to the whole-process risk response strategy was established.It provides reference for the risk assessment of the subsequent construction of similar subway lines and crossing projects.Based on the actual engineering cases of Guangzhou,the application of risk assessment of mine method tunnel construction crossing existing lines is carried out.Based on the actual needs of the relevant operation and management departments of metro,the main risk factors of the risk of subway tunnel crossing the existing lines are identified,and according to the establishment principles of the risk evaluation index system,the risk evaluation index system of the impact of mining method subway tunnel crossing the existing subway lines on the safety of the operating lines is constructed.In this paper,a set of typical flow chart is established to evaluate the impact risk of underground tunnel construction on existing subway lines.At the same time,around the operations through the security in the process of construction in the new line of work target,combining the actual demand of risk control and risk the corresponding work,during the process of each stage of the mining method of tunnel crossing the existing subway line risk and coping strategies,for the domestic other cities like the subway crossing project risk evaluation and operation security.