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  Immersed Tunnel: A Viable Option for The Orlovsky Crossing

  Immersed and Floating Tunnelling. The Orlovsky crossing in St. Petersburg has been a hot topic over the past years. St. Petersburg faces a constant balancing act between river navigation and road traffic. In the ice-free period, the bridges over the Neva River open nightly for an extended period of time to allow ships to pass, stopping road traffic for several hours. A tunnel would provide the first uninterrupted road link between the two parts of the city, which may allow the city’s bridges to be open for longer, effectively increasing the capacity of both road and waterway. The latest design for the link was a two-tier bored tunnel with a TBM diameter of 19.2 m, the largest ever to be constructed. Since the required cover on a TBM tunnel relates directly to its diameter, the depth of the tunnel is significant and the resulting approaches will be long, diminishing the advantages of the bored tunnel.

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