Mannvit has decades of experience in land and subsea tunnel design, engineering, and consulting. The company employs experts in the field of road and aqueduct tunnels and offers a full range of related services covering all phases of tunnel design and engineering. Project experience spans the full range from subsea road tunnels to mountain tunnels to cut and cover tunnels.
The company offers a multidisciplinary approach to tunnel projects, drawing on specialists from other sectors to ensure the success of every project we run. And, with company services spanning the range of all civil engineering disciplines, Mannvit provides its customers with every service they need for a successful tunnel project of any size.
General tunnel engineering services:
- Design
- Engineering geology and rock mechanics
- Geotechnics
- Geophysics
Design services:
- Rock tunneling
- Cut and cover tunnels
- Bored tunnels
- Immersed tunnels
- Engineering geology and rock mechanics:
- Tunnels in soft soils
- Steel sheet pile walls
- Ground anchors
- Reinforced soils
- Driven piles
- Tunnels in rock
- Primary site exploration
- Detailed field investigations
- Detailed sub-surface investigations and engineering geology
- Tunnel mapping and rock mass classification using the Q-method
- Rock support determination
- Detecting and tackling problems caused by water influx
- Grouting
- Ventilation design
- Modeling using RocLab and Phase2
Project examples - Road tunnels:
Project: Vaðlaheiði Road Tunnel, North Iceland
Size: 7.5 km long 60 m2 road tunnel
Value: ~45 M€
Period: 2008
Mannvit services: Preliminary design, feasibility study and project planning of double lane 7.5 km road tunnel between Eyjafjörður and Fnjóskadalur. BOT contract documents.
Project: Norðfjörður road tunnel, East Iceland
Size: 7.8 km long 54 m2 road tunnel
Value: ~45 M€
Period: 2008
Mannvit services: EIA, design of roads and utilities. Design and rock support evaluation for 7.8 km long double lane road tunnel between Eskifjörður and Norðfjörður. Tender documents and final design.
Project: Dýrafjörður Road Tunnel, NW Iceland.
Size: 5.5 km long 54 m2 road tunnel
Value: ~25 M€
Period: 2007‐2008
Mannvit services: Feasibility study followed by project planning and design of a double lane 5.5 km long road tunnel between Dýrafjörður and Arnarfjörður
Project: Design study of Subsea Road Tunnel, Reykjavík, Iceland
Size: Total of about 11 km of tunnels, including double tube tunnel with emergency and connection tunnels
Value: ~125 M€
Period: 2007 ‐ 2008
Mannvit services: Rock mechanics , design review and cost estimation of a two lane double tube subsea tunnel in cooperation with Rambøll.
Project: Óshlíð Road Tunnel, NW Iceland
Size: The project included 53 m2 wide, 5.3 km long two lanes road tunnel
Value: ~25 M€
Period: 2006‐2007
Mannvit services: Design of a road tunnel in Northwest Iceland and rock support evaluation, tender documents and final design.
Project: Héðinsfjörður Road Tunnel, North Iceland
Size: The project included a two‐lane tunnel, about 10.5 km long and 53 m2 wide
Value: ~50 M€
Period: 2006
Mannvit services: Tunnel design, rock support evaluation and preparation of new contract documents.
Project: Road tunnel under Almannaskarð, SE Iceland
Size: The project included 54 m2 wide, 1.3 km long mountain tunnel, with two lanes
Value: ~ 5 M€
Period: 2003
Mannvit services: Design of the tunnel , rock support evaluation as well as preparation of tender documents and final design.
Project: Héðinsfjörður Road Tunnel, North Iceland
Size: The project included a two‐lane tunnel, about 10.5 km long and 53 m2 wide
Value: ~47 M€
Period: 2001‐2002
Mannvit services: Tunnel design and preparation of contract documents.
Project: Fáskrúðsfjörður Road Tunnel, East Iceland
Size: The project included a two‐lane tunnel, about 6 km long and 52.8 m2 wide
Value: ~25 M€
Period: 2001‐2002
Mannvit services: Tunnel design and preparation of contract document for a undersea road tunnel in East Iceland.
Project: Hvalfjarðargöng Subsea Road Tunnel, SW Iceland
Size: 5.7 km long subsea road tunnel with low elevation at –165 m a.s.l. The tunnel cross section area varies from 58 m2 to 78 m2 with some 100 m2 sections in niches and junctions.
Value: ~25 M€
Period: 1996‐1998
Mannvit services: Tunnel field supervision
Project: Botnsdals and Breiðdals Road Tunnel, NW Iceland
Size: The project included a 9 km tunnel
Period: 1993
Mannvit services: Geological engineering consultation in connection with extreme high inflow of water into the road tunnel.
Hydroelectric Projects:
Project: Budarhals Hydroelectric Power Plant, South Iceland
Size: About 4 km of 150 m2 headrace tunnel.
Period: 2001
Mannvit services: Site exploration, rock mechanics and project planning design.
Project: Karahnjukar Hydroelectric Power Plant, East Iceland
Size: A total of about 5 km of tunnels and caverns, including access tunnel, cable tunnel, tailrace tunnel, powerhouse and transformer hall caverns and two over 400 m long vertical shafts
Period: 2003-2005
Mannvit services: Field supervision and rock support determination.
Project: Hraunaveita Diversion, East Iceland
Size: A total of about 3,5 km of 20 m2 diversion tunnels
Period: 2006
Mannvit services: Tender design and tender documents
Project: Hvammur Hydroelectric Power Plant, South Iceland
Size: A total of about 1,5 km of 160 m2 tailrace tunnels
Period: 2008-
Mannvit services: Site exploration, rock mechanics and tender design of tunnel with relatively little rock cover and in active seismic area.
Project: Urridafoss Hydroelectric Power Plant, South Iceland
Size: A total of about 2 km of 200 m2 tailrace tunnels
Period: 2008-
Mannvit services: Site exploration, rock mechanics and design of tailrace tunnel in active seismic area.
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