Swinoujscie

Project Swinoujscie, Poland

The Polish city of Świnoujście extends over the eastern part of the island of Uznam as well as over the islands of Wolin and Karsibór. Uznam and Wolin (the largest islands of Świnoujście) are separated by the Świna Strait, an arm of the Baltic Sea. Traffic between the islands is currently carried out via ferry connections across the Świna. Due to the high-capacity utilization of the ferry crossings, waiting times during the holiday season can be up to several hours. Fluctuating weather conditions make ferry operations even more difficult. In the event of unfavorable weather conditions, it happens that Świnoujście is cut off from the rest of the country, which in turn poses a threat to its security. Building a permanent connection - tunnel will ultimately solve these problems.

The total length of the project is approximately 3.2 km. This includes a 1.44 km TBM-excavation in the slurry shield procedure. The breakout diameter of the tunnel will be 13.5 m. A two-way roadway will be constructed with traffic lanes with a width of 3.5 m and evacuation niches will be built using ground freezing. 

Geologie Information:
The tunnel features a crown overburden of approximate 26m and the minimum horizontal turning radius is 300m. The tunnel alignment crosses fine sand and fine-medium sand with gravel in Uznam and Wolin sides, while below Swina strait main deposits are fine-medium sand with gravel, OC sandy clay with gravel and chalk.

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