There is 2 possibilities to how the tunnel has been designed. It is either a semi circle of corrugated metal on top of a concrete base, or it is a pipe shape of corrugated metal throughout.
From previous work I can say that a pipe shape is very strong but it would have required more drilling when building the tunnel so I am going to assume it is the first option. Therefore the forces acting on the tunnel are as follows:
Arches are always under compression. The force of compression is pushed outward along the curve of the arch into the earth around the tunnel. This means that the actual forces on the tunnel are relatively small in comparison to the overall dissipated forces.
Matthew Dean
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