- Tunnel - Wikipedia
It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length
- Tunnels and underground excavations | History, Methods, Uses, Facts . . .
tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock, such as limestone A vertical opening is usually called a shaft
- How Tunnels Work - HowStuffWorks
Constructing a tunnel is one of the most complex challenges in the field of civil engineering Learn about the basics behind tunnels
- TUNNEL Definition Meaning - Merriam-Webster
The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction How to use tunnel in a sentence
- TUNNEL | English meaning - Cambridge Dictionary
TUNNEL definition: 1 a long passage under or through the ground, especially one made by people: 2 the long passage… Learn more
- Tunnel - New World Encyclopedia
In general, tunnels are at least twice as long as they are wide and are completely enclosed on all sides, save for the openings at each end A tunnel may be used by pedestrians, cyclists, motor vehicles, or rail traffic
- Norway is building the world’s longest, deepest undersea road tunnel
The world’s longest and deepest undersea road tunnel is being built in Norway, intended to cut travel time between major cities and become part of a ferry-free highway along its western coast
- Tunnels - Structures - Bridges Structures - Federal Highway . . .
Due to their higher capital costs and additional levels of maintenance, significantly fewer road tunnels have been built within the U S when compared with other highway structure alternatives such as bridges, viaducts and depressed roadways
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