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Underground car park in the Schloßberg, Landsberg upon Lech

The town of Landsberg am Lech with its topographical speciality, the twofold natural barrier provided by the river and its steep bank has tackled the problem of cutting down on traffic through constructing a cavern garage as an important first step within the framework of the reorganisation of inner-urban traffic. The cavern is completely located in tertiary marl, which is covered by a roughly 20 m thick quaternary layer of gravel. The upper part of the tertiary marl is formed by a 3 to 4 m thick water-tight clay layer. The cavern roof is located directly below the clay layer. The groundwater level lies some 4 to 5 m above the cavern roof. The cavern, the access tunnel and shafts were created by shotcreting, which ensured rapid securing of the surrounding rock with steel arches, structural steel meshing and shotcrete. In order to reduce settlements, the cavern was driven in 9 part-sections. In this way, it was intended to avoid damage to the buildings on the Schloßberg in particular. A civil defence bunker tunnel, which crossed the access tunnel after some 30 m, caused special problems. As neither its position nor state was known, far-reaching investigations and substantial additional measures designed to stabilise and fill the former tunnel were required.


  • Country: Germany
  • Region: Bavaria
  • Tunnel utilization: Cavern
  • Type of utilization: Parking garage for 365 cars and civil defence shelter for 5000 persons
  • Client: Stadt Landsberg am Lech
  • Main construction method: Trenchless
  • Type of excavation: Drill-and-blast
  • Lining: Shotcrete
  • No. of tubes: 1
  • Tunnel total length: 182 m
  • Maximum cross-section excavated: 250 m²
  • Total excavated volume: 55,000 m³
  • Construction start/end: June 1988 till Autumn 1992