How Are Underground Tunnels Built?

There are three basic types of tunnel construction in common use. Cut-and-cover tunnels are constructed in a shallow trench and then covered over. Bored tunnels are constructed in situ, without removing the ground above. Finally, a tube can be sunk into a body of water, which is called an immersed tunnel.

How Are Underground Tunnels Built?

Underground tunnels are some of the most fascinating and complex engineering projects ever undertaken. From large transport tunnels to small drainage systems, these feats of engineering are designed to make our lives easier and more efficient. But how exactly are they built?

The process of building an underground tunnel is quite complicated and has a few distinct stages. First, the desired route of the tunnel must be determined and the surrounding geology must be studied. This is done to ensure that the tunnel will be safe and able to withstand the pressures that it will be subject to in the future.

Once the route of the tunnel has been determined, the construction team will begin the excavation process. This involves removing the earth and rock above and around the tunnel route. Depending on the location and size of the tunnel, this step can be done by hand, with heavy machinery, or a combination of the two.

Once the tunnel is dug out, the next step is to install the lining. This lining is typically made of concrete and steel and is designed to keep the walls of the tunnel stable and structurally sound. This lining also helps keep water out of the tunnel, which is especially important for tunnels that are used for transport purposes.

Finally, any additional infrastructure will be installed

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