Why Tunnels Don't Collapse

How simple reinforcement is used to prevent collapse of rock tunnels.

Tunnels play an important role in our constructed environment as passageways for mines, conveyance for utilities, and routes for transportation. Rock bolts are a type of reinforcement for stabilizing rock excavations, usually made from steel bars or bolts. This simple construction method dramatically reduces the cost of making tunnels through rock safe from collapse.

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Tonic and Energy by Elexive is licensed under a Creative Commons Attribution License
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Credit for this demonstration that was originally conceived by Tom Lang