Monitoring Technique and Operation Organization for Super-diameter Shield Tunnel Crossing Operating Tunnel

With the increasing utilization rate of urban underground space, shield tunnel excavation of new tunnel will inevitably cause disturbance and deformation to existing ones, which is bound to increase the difficulty of metro monitoring. It is of great significance for underground construction and operation to reduce the operating tunnel deformation caused by shield tunneling construction through construction techniques, protection schemes and countermeasures. Based on the project of super-diameter shield of Shanghai North Cross Passage undercrossing Metro Line 11 interval tunnel, combined with procedure nodes including crossing preparation and process, monitoring technique and operation organization such as risk analysis, crossing scheme, countermeasure strategy and control standards are considered to control the structure deformation of operating tunnel and to ensure the safety of metro operation.