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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
Tunnel construction - Wikipedia 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
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 and underground excavations - Encyclopedia Britannica 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
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
22 Types of Tunnels - Uses, Advantages . . . - Engineering Learn Tunnels are counterfeit submerged burrows that are worked without harming the outer layer of the earth The passages are submerged paths utilized for the most part for transport purposes They might be utilized to move cargo and voyagers, water, and disinfection, individually
Tunnels: Essential Structures in Transportation Infrastructure . . . Tunnels are underground or underwater passages designed to allow transportation through or beneath natural and man-made barriers Engineers use tunnels in diverse applications, including roads, railways, subways, and water systems
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