Deep level underground
Construction 20 meters or more below ground, using methods other than cut-and-cover / From Wikipedia, the free encyclopedia
Deep level underground is construction that is 20 m (66 ft) or more below ground and not using the cut-and-cover method, especially train stations, air raid shelters and bunkers, and some tunnels and mines. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support structure that is strong enough to carry the load of what is to be built above the tunnel.
The examples and perspective in this article deal primarily with the United Kingdom and do not represent a worldwide view of the subject. (June 2017) |