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  The Extension of the U12 Lot 3 in Stuttgart – Tunneling at its Best

  The capital of Baden Württemberg, Stuttgart, is extending its commuting network. The subway line U12 is therefore being completely reorganized: some parts of it are being closed down and other parts are being built from scratch. A joint venture consisting of Leonhard Weiß Ingenieurbau, Alfred Kunz Untertagebau and Bauer Spezialtiefbau was awarded the construction of lot 3 of subway U12. Altred Kunz Untertagebau München has been working since February 22, 2014, on the Waltraud Tunnel, which is the key structure in this extension of the U12. The tunnel has a length of 200 meters and is mostly constructed of artificial backfill material. It passes under a railroad embankment that will remain in operation. The embankment and the rails are sensitive with regard to settlement, so the biggest challenge is a reduction in settlement dur- ing the underpass of the railroad. The tender design consisted of two side headings with a cross section of 77 m².

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