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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
- How Tunnels Work - HowStuffWorks
In this article, we'll explore what makes tunnels such an attractive solution for railways, roadways, public utilities and telecommunications We'll look at the defining characteristics of tunnels and examine how tunnels are built
- Tunnel construction - Wikipedia
Tunnels are dug in types of materials varying from soft clay to hard rock
- 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
- List of tunnels in the United States - Wikipedia
Fort George Tunnel, IRT Broadway–Seventh Avenue Line (1 train), 2 miles of rock tunnel from 157th Street to Dyckman Street, the second-longest two-track tunnel in the country (after the Hoosac Tunnel) when completed in 1906
- Holland Tunnel - Wikipedia
The Holland Tunnel is a vehicular tunnel under the Hudson River that connects Hudson Square and Lower Manhattan in New York City in the east to Jersey City, New Jersey, in the west The tunnel is operated by the Port Authority of New York and New Jersey and carries Interstate 78
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