Risk Assessment of Operation Period Structural Stability for Long and Large Immersed Tube Tunnel

Immersed tube tunnel has been widely used in virtue of its characteristics of shallow burial, good waterproof performance, strong stratum adaptability, etc., however, it is also characterized by enclosed space, prolonged submersion of structure in deep water, complicated surrounding environment, etc., particularly, in case of accident of tunnel structure, inestimable losses will be caused, therefore, the control of structural stability risk in operation period is especially important. This article carries out risk source analysis and identification, scenario design and simulation analysis, risk loss judgment standards and weight research for structural stability of long and large immersed tube tunnel in operation period on basis of extra-large immersed tube tunnel of the fourth lane of Shenzhen-Zhongshan Thoroughfare, based on which and in combination with the relevant domestic and foreign risk assessment and expert research results, the structural stability risk levels and risk scores of structural stability in operation period are obtained by quantitative risk calculation method and the relevant suggestions for risk control are proposed.