2016
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The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction. How to use tunnel in a sentence.
A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is perfectly enclosed except for the two portals common at each end.
Tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock. Tunnels have many uses: for mining ores, for transportation—including road vehicles, trains, subways, and canals—and for conducting water and sewage.
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.
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.
an underground passage. a passageway, as for trains or automobiles, through or under an obstruction, as a city, mountain, river, harbor, or the like. an approximately horizontal gallery or corridor in a mine. the burrow of an animal. Dialect. a funnel.
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.
