Abstract: To study the stress and deformation characteristics of the segments at the connecting gallery of shield tunnels under different opening types of steel pipe, and select a safer and faster opening method, a case study is conducted on #1 connecting gallery of Pazhou west stationXiancun station in Guangzhou, China. The numerical simulation and field measurement methods are carried out to study the rapid opening technology of steel pipe sheet of shield tunnel. The results show the following: (1) The use of steel pipe sheets at the connecting gallery of shield tunnel can reduce the disturbance to the surrounding rock and the tunnel segments. (2) The opening type with four steel pipe sheets is proposed to ensure the force of the segments and avoid structural instability. The formed homocentric squares loadbearing structure retains a complete force system, which can alleviate the stress concentration at the opening of the connection gallery. (3) The connection gallery construction adopts the support method of four steel sheets and concrete pipe support, and temporary support can guarantee the bearing capacity of the structure.

Key words: connecting gallery, opening form, steel pipe sheet, numerical simulation, segment assembly