Undersea transport links – a bored tunnel in a major shipping lane
Christoph Eberle, Mott MacDonald: Undersea transport links – a bored tunnel in a major shipping lane
The 42’ / 12.8m diameter steel fibre reinforced concrete (SFRC) Parallel Thimble Shoals Tunnel (PTST) is projected to improve transport links across the Chesapeake Bay between the mainland United States and the Delmarva Peninsula. Local space constraints require the construction of the tunnel through berms and submarine sediments and organic material, leading to consolidation settlements of the tunnel bedding after construction. The use of the Thimble Shoals channel as a major shipping lane triggers the necessity to consider ship impacts as well as loading from sunken ships.
This presentation will illustrate the safety concept substantiating the design and focus on key challenges in the design of one of the largest segmentally lined tunnels relying solely on steel fibre reinforcement”