Technical specifications

Scope of work

  • 2 parallel tunnel tubes
    Length: 1.15 km each
    Internal diameter: 10.10 m
  • 4 cross-passages
  • 2 ramp structures serving as start and/or target shafts
  • 2 intersections – East and West –
    consisting of bridge structures with 2 roundabouts each

Construction method

  • TBM tunnelling using a Hydroshield (slurry shield)
  • Shield diameter: 11.32 m
  • Reinforced concrete segmental lining
  • Wall thickness: 45 cm


  • Sand
  • Silt
  • Boom Clay
  • Sand containing glauconite

General data

Sluiskil Canal Crossing
twin-bore road tunnel under the Ghent-Terneuzen Canal

Province of Zeeland [Provincie Zeeland]
represented by BV Kanaal-kruising Sluiskil

Wayss & Freytag Ingenieurbau AG
in a joint venture

Construction period
October 2010 to May 2015

Construction costs
€ 233 millions

Road Tunnel
2 x 1.15 km
Construction Method
TBM tunneling using a Hydroshield (slurry shield)

The Combinatie BAM TBI Joint Venture consisting of BAM Civiel bv, Wayss & Freytag Ingenieurbau AG, Mobilis B.V. and Croon Elektrotechniek B.V. has been contracted by the Province of Zeeland, represented by the special purpose company BV Kanaalkruising Sluiskil (BVKKS), to construct a new road tunnel underneath the Ghent-Terneuzen Canal. The region surrounding Terneuzen lies on the central axis between the import antharbour areas of the Netherlands in the north and of Flanders in the south.Terneuzen is undergoing extensive infrastructure upgrades (development of new industrial areas and widening of the canal). A major bottleneck in the region is National Road N61. It currently crosses the canal via a swing bridge, which is closed during shipping traffic.

In view of this situation and taking into consideration a future increasing traffic, a new road crossing in the form of a tunnel is required. The new road connection consists of two separate dual lane tunnels bored with one slurry shield TBM. The tunnels have a length of 1,150 m each, an external diameter of 11.32 m and are lined with 45 cm thick segments. The tunnel overburden is between 3 and 25 m. The tunnel drive begins in very soft ground conditions consisting of sand and silt. With increasing depth, the stiffness of ground increases. At its lowest point the tunnel will be bored through Boom Clay.

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