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Tunnel - Wikipedia 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 length
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 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
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
Tunneling - Geoengineer. org 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
Home - Gateway Program The Hudson Tunnel Project will make two crucial improvements to the national rail network: Building nine miles of new passenger rail track between New York and New Jersey, including nearly five miles of tunnel boring to construct a new, two-tube tunnel under the Hudson River