Micro-disturbance construction in closely overlapped shield tunneling based on automatic monitoring

摘要

This paper presents the tunneling construction of the second-stage of Metro line 13 project.rnAccording to the construction of overlapping shield tunnel in soft soil area, in this paper the displacements andrninternal forces and longitudinal crack of the existing tunnel are monitored. Through real-time monitoring andrndata feedback, the power tunnel construction control is realized. In the process, some key technologies are putrnforward, such as the setting of earth pressure value and excavation speed, synchronous grouting control andrntransformation of the shield machine. Finally undercrossing construction attains the expected results and meetsrnprotection requirements of the existing tunnel structure.