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A tunnel is an underground or undersea passageway. 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 lenth.
The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction. How to use tunnel in a sentence.
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.
A tunnel is a horizontal passageway located underground. While erosion and other forces of nature can form tunnels, in this article we'll talk about man made tunnels -- tunnels created by the process of excavation.
Tunnel construction is a subset of underground construction. There are three basic types of tunnel construction in common use: Cut-and-cover tunnel, constructed in a shallow trench and then covered over. Bored tunnel, constructed in situ, without removing the ground above. They are usually of circular or horseshoe cross-section.
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.
Jul 21, 2024 · Channel Tunnel, rail tunnel between England and France that runs beneath the English Channel. It is 50 km (31 miles) long and consists of three tunnels: two for rail traffic and a central tunnel for services and security. Learn more about the Channel Tunnel, including its history.
TUNNEL definition: 1. a long passage under or through the ground, especially one made by people: 2. the long passage…. Learn more.
A tunnel is an underground structure which is constructed through the surrounding mass of soil or rock. Typically, a tunnel’s length is much greater than its width. Tunnels are designed to withstand earth forces applied from all sides.
Apr 7, 2016 · Tunnels defy landscapes. By design they push away water, burrow through mountains, or simply encase the passenger in a protective shell from the outside. Tunnels provide passage in places that...
