Tunnels of the world
Contents |
[edit] Channel Tunnel (UK and France)
The Channel Tunnel carries high-speed Eurostar trains beneath the English Channel to and from Folkestone in Kent, UK and Pas-de-Calais in France. The tunnel’s total length is 31.4 miles (50.5 km), with 23.5 miles (37.9 km) undersea, making it the longest undersea tunnel in the world.
Whilst the original idea was proposed as far back as 1802, it was only in June 1988 that the first tunnelling work began, and it was formally opened in May 1994.
At its lowest point the tunnel is 75 m (250 ft) deep, and trains are capable of travelling at 160 km/hr (99 mph).
[edit] Laerdal Tunnel (Aurland, Norway)
The Laerdal Tunnel (see top image) is a road tunnel connecting Laerdal and Aurland in West Norway. At 15.23 miles (24.51 km), it is the longest road tunnel in the world. Work began in 1995, and involved tunnelling through a mountain range. It was completed in 2000.
The project was innovative in the way that engineers sought to alleviate the psychological strain of driving for 20 minutes through a tunnel. It is lit with white and yellow lights to give the impression of sunrise, together with three large cave sections that allow for rest breaks and to give the illusion that drivers are travelling through a number of smaller tunnels.
[edit] Tokyo Bay Aqua-Line (Tokyo, Japan)
The Aqua Line crosses Tokyo Bay connecting the cities of Kawasaki and Kisarazu. With an overall length of 14 km (8.7 miles) it incorporates a 4.4 km section of steel box girder bridge with orthotropic deck and a 9.6 km section of underwater bored shield tunnel. Where the bridge and tunnel intersect there is an artificial island that serves as a rest area for drivers.
After 23 years of planning, the Aqua Line opened in December 1997, setting a precedent for constructing two-lane road tunnels. It was designed with earthquake resilience in mind, as was demonstrated in a 2011 earthquake that caused severe damage to Tokyo Bay.
[edit] Eisenhower Tunnel (Colorado, USA)
The Eisenhower Tunnel is a twin-bore tunnel under the Continental Divide in the Rocky Mountains. Though the project was only supposed to take 3 years to complete, complications arose when the boring machines could not work to their usual productivity level at such high elevations. When completed in 1979 it became the highest road tunnel in the world, at 3,401 m (11,158 ft) above sea level. The length of the tunnel is 1.7 miles (2.72 km).
[edit] SMART (Kuala Lumpur, Malaysia)
The ‘Stormwater Management and Road Tunnel’ is the second longest stormwater tunnel in Asia, at 6 miles (9.7 km). The main purpose of the tunnel is to alleviate the problem of Kuala Lumpur’s flash flooding, by allowing storm water to flood the tunnel, as well as serving as a road to reduce rush hour traffic congestion. The rainwater is diverted into a lower channel, whilst road traffic travels along the upper level. Automated water-tight gates are opened and closed to allow the flood waters to pass through.
[edit] Seikan Tunnel (Japan)
At 14.2 miles (23 km) long and 140 m (460 ft), the Seikan is the longest and deepest rail tunnel in the world. It spans the Tsugaru Strait that connects the islands of Honshu and Hokkaido, a risky journey by water due to the unpredictable weather such that an underground tunnel had long been an aspiration. The double track rail tunnel allows an operating speed of 140 km/h (85 mph).
The rock and soil under the strait made it impossible to use a tunnel boring machine, so dynamite and drills had to be used to blast out more than 30 miles of the tunnel, a considerable engineering feat especially since it was achieved through a known earthquake zone.
[edit] Related articles on Designing Buildings Wiki
- 7 Engineering Wonders of the World.
- 9 of the world’s most impressive structures.
- Bridge construction.
- Bridges of the world.
- Building of the week series.
- Channel.
- Chesapeake Bay Bridge-Tunnel.
- Civil engineering dream projects.
- East West Metro Tunnel, Calcutta.
- Follo Line, Norway.
- Global undergrounds - exploring cities within.
- River engineering.
- Stad Ship Tunnel.
- Tunnelling.
- Tunnel Engineering Exhibition 2017.
[edit] External references
- CNN - Great tunnels
Featured articles and news
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.
Architectural Technologist CPDs and Communications
CIAT CPD… and how you can do it!
Cooling centres and cool spaces
Managing extreme heat in cities by directing the public to places for heat stress relief and water sources.
Winter gardens: A brief history and warm variations
Extending the season with glass in different forms and terms.
Restoring Great Yarmouth's Winter Gardens
Transforming one of the least sustainable constructions imaginable.
Construction Skills Mission Board launch sector drive
Newly formed government and industry collaboration set strategy for recruiting an additional 100,000 construction workers a year.
New Architects Code comes into effect in September 2025
ARB Architects Code of Conduct and Practice available with ongoing consultation regarding guidance.
Welsh Skills Body (Medr) launches ambitious plan
The new skills body brings together funding and regulation of tertiary education and research for the devolved nation.
Paul Gandy FCIOB announced as next CIOB President
Former Tilbury Douglas CEO takes helm.
UK Infrastructure: A 10 Year Strategy. In brief with reactions
With the National Infrastructure and Service Transformation Authority (NISTA).
Ebenezer Howard: inventor of the garden city. Book review.
The Grenfell Tower fire, eight years on
A time to pause and reflect as Dubai tower block fire reported just before anniversary.
Airtightness Topic Guide BSRIA TG 27/2025
Explaining the basics of airtightness, what it is, why it's important, when it's required and how it's carried out.
Construction contract awards hit lowest point of 2025
Plummeting for second consecutive month, intensifying concerns for housing and infrastructure goals.
Understanding Mental Health in the Built Environment 2025
Examining the state of mental health in construction, shedding light on levels of stress, anxiety and depression.
The benefits of engaging with insulation manufacturers
When considering ground floor constructions.
Lighting Industry endorses Blueprint for Electrification
The Lighting Industry Association fully supports the ECA Blueprint as a timely, urgent call to action.
Comments
The excavation method of TBM + Conveyor is the most efficient way for long and wide tunnels.
A vertical conveyor for deep shaft to lift mucks to ground is safer and quicker.