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- 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
- 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
- List of tunnels in the United States - Wikipedia
More tunnels may be found in each state than are included on this list 5th Avenue North Tunnel, Birmingham Completed in 1909, this road tunnel runs beneath the former Birmingham Terminal Station site, now occupied by the Red Mountain Expressway [1]
- Tunnels and underground excavations - Tunneling techniques | Britannica
Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous
- Tunnel construction - Wikipedia
Tunnels are dug in types of materials varying from soft clay to hard rock
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- Tunnel - definition of tunnel by The Free Dictionary
Define tunnel tunnel synonyms, tunnel pronunciation, tunnel translation, English dictionary definition of tunnel n 1 An underground or underwater passage 2 A passage through or under a barrier such as a mountain 3 A tube-shaped structure v tun·neled ,
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