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A tunnel is relatively long and narrow; the length is often much greater than twice the diameter, although similar shorter excavations can be constructed, such as cross passages between tunnels. A tunnel made by an animal is commonly referred to as a burrow and may or may not have multiple portals.
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. Tunnels have many uses: for mining ores, for transportation —including road vehicles, trains, subways, and canals ...
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 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.
The tunnel engineering is one of the most interesting disciplines in engineering. The work is complex and difficult throughout its course, even though it is interesting. The tunnels are defined as the underground passages that are used for the transportation purposes.
A tunnel construction is an underground passage provided beneath earth surface or water. Different methods of tunnel construction and their details are discussed. In most of the cases tunnel construction is expensive but it saves time and provides comfort.
At its most basic, a tunnel is a tube hollowed through soil or stone. Constructing a tunnel, however, is one of the most complex challenges in the field of civil engineering. Many tunnels are considered technological masterpieces and governments have honored tunnel engineers as heroes.
A soft-ground tunnel below the water table involves a constant risk of a run-in—i.e., soil and water flowing into the tunnel, which often results in complete loss of the heading. One solution is to lower the water table below the tunnel bottom before construction begins.
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, Horizontal or nearly horizontal underground or underwater passageway. Tunnels are used for mining, as passageways for trains and motor vehicles, for diverting rivers around damsites, for housing underground installations such as power plants, and for conducting water.
