Abstract:

The consolidation of shafts for large diameter shield boring is discussed in this paper, with the shield tunneling of the underground transit line in Beijing as an example. The method of consolidation by plain piles is studied in detail. For the sake of the consolidation method adopted, the problems of safe launching of large diameter shield in sandy cobble stratum and the cutter replacing under the atmospheric pressure during long distance boring are successfully solved. The practice shows that the consolidation by plain piles is effective, with the shield being launched successful with little ground settlement and zero collapse.

Key words: large diameter shield, launching, cutter replacing, shaft consolidation, plain concrete pile