How do you stabilize a tunnel?

Installation of Rock Bolts for Extra Support: Another technology used in stabilizing tunnel portals is the installation of rock bolts. These are metal bars placed in the tunnel's walls and ceiling, providing extra support and improving the structure's overall stability.



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Although this is also seen to a certain extent in bridges, it is not to the extent seen in tunnels. Events such as earthquakes and floods, which are the major causes of collapse of other structures, account for only about 10% to 20% of all tunnel collapses.

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Luckily, tunnels are highly unlikely to fall. Civil engineers work hard to build safe, strong tunnels. They know that tunnels have to stand up to forces of tension, torsion, compression, and shearing. Tunnels also need to carry the weight of people and vehicles traveling through them.

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