Study On Risk Assessment And Control Of Subway Tunnel Construction On Adjacent Buildings

During the construction of the subway tunnel,due to the geological conditions and the surrounding environment,it is easy to cause damage to neighboring houses,pavements,municipal pipelines,etc.,which seriously threatens the safety of surrounding buildings and causes greater economic losses.Therefore,it is necessary to evaluate the risk of adjacent buildings in the subway tunnel construction identify risks in time and take measures to reduce the probability of occurrence,reduce losses,and ensure normal construction.Based on the urban shield shallow-buried tunnel,this paper uses WBS-RBS coupling matrix method to identify the risk of adjacent buildings.With the improved Monte Carlo method as the basic method,a comprehensive risk consequence assessment model of metro shield construction on adjacent buildings is established and applied to a tunnel of Zhengzhou Metro.The main research results are as follows:(1)Shield tunneling is often used in urban metro tunnel construction.Through literature research at home and abroad,WBS-RBS risk identification method is used to identify the possible risks of adjacent buildings,and the risk assessment index system of adjacent buildings is constructed.(2)By using the method of literature research the paper counts the cases of damage to adjacent buildings caused by shield tunneling of urban metro in China,transforms the risk of metro tunnel construction to a quantifiable probability event,uses Monte Carlo method and combines the improved analytic hierarchy process to calculate the weight of risk factors.The probability simulation analysis is carried out with MATLAB software,and the comprehens ive risk consequence evaluation model is established.(3)Applying the established comprehensive risk consequence assessment model to a tunnel of Zhengzhou Metro Line 4,combining with the specific engineering situation,the risk grade is calculated,and according to the weight of risk factors,the corresponding risk measures are put forward to ensure the construction safety.calculated,and according to the weight of risk factors,the corresponding risk measures are put forward to ensure the construction safety.(4)The finite element software MIDAS/GTS is used to simulate the construction stage of a section tunnel of Zhengzhou Metro Line 4,and a new numerical model is established based on the results of risk assessment and the proposed risk treatment measures.At the same time,the monitoring and measurement of adjacent buildings in the construction site are carried out,and the monitoring and measurement results are compared with the original model and the optimized model after taking risk treatment measures to verify the feasibility of the risk treatment measures and the accuracy of the risk assessment model in this paper.