Why Tunnels Don’t Collapse

Tunnels play an important role in our constructed environment as passageways for mines, conveyance for utilities, and routes for transportation. But, excavating a tunnel underground in unstable material can lead to some dangerous situations, like the 2010 mining accident in Chile when 33 men were trapped deep in subsurface for more than 2 months. Rocks are heavy. That may seem self-evident, like many fundamental principles of civil engineering. But when you build things underground, it

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