Study On Risk Assessment And Preventive Measures Of Metro Shield Tunnel Crossing High-speed Railway

With the rapid development of China's economy,urban rail transit is becoming a hot topic in today's construction.In order to reduce the occupation of urban space,urban rail transit structure in the form of underground tunnels.The shield construction method with its high construction efficiency,small footprint,the surrounding environment is relatively small and other advantages,in the subway construction is generally used.Due to the integrity of the city,the scarcity of land and traffic passenger flow clustering and other factors,inevitably bring the subway and high-speed rail between the two modes of communication between the cross.Unlike the common structures in the tunnel crossing project,the key to crossing the high-speed railway project is to ensure the normal construction of the tunnel and to ensure the normal operation of the existing high-speed railway.Due to the high speed of high-speed railway operation,the deformation of the foundation under the track is very strict,the construction is difficult.If the tunnel does not take effective control measures during the tunnel crossing,it will likely adversely affect the infrastructure of the existing high-speed railway,which will bring serious safety risks to the safe operation of the high-speed railway and greatly increase the safety risk of the project.Therefore,it is of great significance to carry out the research on the safety risk of the subway shield tunnel through the existing high-speed railway.In this paper,the safety risk identification,risk analysis and evaluation of Shield Tunneling through high-speed railway project are studied,and the shield tunnel is traversed by the existing high-speed rail structure and the relative position relationship between the tunnel and the existing high-speed railway line.There are high-speed rail project classification,and the tunnel through the high-speed rail construction technology technical difficulties were analyzed.Based on the principles of science,comprehensiveness,qualitative and quantitative,the evaluation index of safety risk assessment for the crossing project is selected,and the tunneling tunnel is established through the combination of survey scoring method and numerical simulation.Finally,the Nanjing Metro Line 5 shield tunnel through the Beijing-Shanghai high-speed railway project as the object of analysis,the use of survey scoring method and numerical simulation of the combination of the tunnel through the Beijing-Shanghai high-speed rail project safety risk assessment,the results that the crossing project Higher risk,need to take some security measures to protect.Finally,by comparing the results of the numerical analysis and the field monitoring data after the implementation of the risk response measures,the research ideas and achievements of this paper are verified.