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Bookmark or Share- Tunnels and underground excavations - Tunneling techniquesTunnels and underground excavations - Tunneling techniques: Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous. While these four broad types of ground condition require very different methods of excavation ...
- Tunnel Definition & Meaning - Merriam-WebsterThe 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 BritannicaTunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock. Tunnels have many uses: for mining ores, for transportation—including road vehicles, trains, subways, and canals—and for conducting water and sewage.
- Tunnel Construction | NATM & TBM » Geology ScienceA tunnel is an underground passageway that is excavated through soil, rock or both. Tunnels are used for transportation, water conveyance, sewage, and utility conduits. They have a long history of use, dating back to ancient civilizations, and have become increasingly important in modern society for transportation and infrastructure development.
- Channel Tunnel | Description, History, Construction, & FactsIt is 50 km (31 miles) long and consists of three tunnels: two for rail traffic and a central tunnel for services and security. Learn more about the Channel Tunnel, including its history.
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