rapid excavation and tunneling conference

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tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… … Universalium
Heathrow Airside Road Tunnel — It connects the airside roads around Terminals 1, 2 and 3 to the airside roads around Terminal 5.The ART is 1.42 km long, consisting of 60 m of twin cell cut and cover box at each end, linked by a pair of 1.3 km bored tunnels. The ART was… … Wikipedia

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