To tunnel somewhere means to make a tunnel there. The rebels tunnelled out of a maximum security jail see also wind 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. Ancient civilizations used tunnels to carry water for irrigation and drinking, and in the 22nd century BC the Babylonians built a tunnel for pedestrian traffic under the Euphrates River. The Romans built aqueduct tunnels through mountains by heating the rock face with fire and rapidly cooling it with water, causing the rock to crack. The introduction of gunpowder blasting in the 17th century marked a great advance in solid-rock excavation. For softer soils, excavation is accomplished using devices such as the tunneling mole, with its rotating wheel that continuously excavates material and loads it onto a conveyor belt. Railroad transportation in the 19th-20th century led to a tremendous expansion in the number and length of tunnels. Brick and stone were used for support in early tunnels, but in modern tunneling steel is generally used until a concrete lining can be installed. A common method of lining involves spraying shotcrete onto the tunnel crown immediately after excavation. carpal tunnel syndrome Channel Tunnel wind tunnel
1 A structure, installation, or facility incorporating apparatus to simulate flight conditions in one way or another, specially designed for testing or experimenting with power plants, or with aircraft, rockets, or other aerodynamically designed bodies, engine installations, or models; specifically, a wind tunnel
a tunnel used to carry a roadway through a mountain or under a river instead of around or over those obstacles Tunnels can be very expensive to construct and maintain due to drilling and ventilation requirements Generally, most tunnels are located in mountainous or hilly regions, and examples include the Fort Pitt Tunnel (Interstate 279) in Pittsburgh and the Waldo Tunnel (U S 101) north of San Francisco
1 the space or channel between the bottom of the hull center section, or main hull, and the sponson inner walls and air traps, in which air flow is directed and compressed by the boat's forward motion, generating a high- pressure air cushion to partially support the weight of the boat
- the horizontal excavation On the Nancy Creek Tunnel, the main tunnel extends 43,700 feet from the Johnson Ferry Road shaft to the RM Clayton shaft Along the alignment, the depth of the tunnel ranges from 95 to 330 feet Only about 800 feet of the 43,700-foot length will be excavated by drilling and blasting (400 foot long TBM starter tunnels at the RM Clayton and Roswell Road shafts) The remaining length will be excavated using TBMs
a large, underground structure used to store and transport wastewater, combined sewage or storm water during rain storms Tunnels usually have higher storage capacities than basins and are capable of transporting their flows directly to a wastewater treatment plant
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