Technical specifications

2 single-track railway tunnels

  • Length: 2 x 6,822 m
  • Internal diameter: 9.60 m

2 cut and cover tunnel sections

  • Each approximately 75 m long
  • 13 cross-passages
  • 2 tunnels for technical purposes

Railway sections in a cutting and on an embankment

  • Lengths: 1,000 m and 340 m

Construction of sonic boom structures at all 4 tunnel portals in order to avoid the sonic boom effect

  • Length: 75 m

Construction method

  • TBM tunnelling using 2 Mixshields (slurry shields)
  • Shield diameter: 10.88 m
  • After 1,500 m conversion of TBMs from slurry shield mode to hard rock mode
  • Segmental lining
  • Thickness of segments: 45 cm
  • Lowering of groundwater table by means of deep wells during tunnelling in open mode (water pressure 6.1 bar)

Geology

  • Buntsandstein (variegated sandstone)
  • Fault zone with Keuper sandstone formations

General data

Project
Finne Tunnel
Part of new Erfurt-Leipzig-Halle railway line
Single-track railway tunnel

Client
DB Netz AG [German rail company]
represented by DB Projekt Bau GmbH
Projektzentrum Leipzig

Contractor
Wayss & Freytag Ingenieurbau AG
as technical leader of a joint leader

Construction period
December 2006 to September 2012

Construction costs
€ 270 million

Utilisation
Infrastructure
Type
Railway tunnel, single-track
Length
2 x 6,822 m
Construction Method
TBM tunneling using 2 Mixshields

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