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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Source: https://www.youtube.com/watch?v=U6fBPdu8w9U
Credit for this demonstration that was originally conceived by Tom Lang