TBM safe havens were incorporated as part of the segmentally lined Slurry Tunnel Boring Machine (STBM) tunnels beneath Sunnyside Yard on the East Side Access Project in Queens, New York, and included one frozen safe haven. Considerations were given to providing a good seal behind the TBM, keeping it from freezing into the block, and the slurry procedures for mining into and out of the block. However, the frozen ground did not provide the safe haven that was hoped. This paper will discuss the experience with the safe haven and the lessons learned by multiple parties for application to future projects.
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