6.3 Replacement Technology of Pressured Cutter in ...
With the continuous application and development of shield technology in China，the river-crossing tunnel shows the characteristics of large diameter，long distance，high water pressure and soft and hard excavation surface.Long-distance tunneling in upper soft and lower hard strata puts forward higher requirements for the life of the cutter.It is inevitable to repair or replace the cutter in the tunneling process.However，due to the complexity and variability of the geological conditions and the limitations of the surrounding conditions，it is often difficult to implement atmospheric cabin entry by reinforcing the soil in front of the excavation.With the characteristics of no need for stratum reinforcement，strong geological adaptability，low requirements for the surrounding environment and small influence，the technology of pressurized cabin entry solves the problem of tool change under harsh conditions.