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excavation
technology
Also known as: underground construction, underground excavation
Learn about this topic in these articles:
main reference
- In tunnels and underground excavations
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,
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