The meaning of TUNNEL is a covered passageway; specifically : a horizontal passageway through or under an obstruction. How to use tunnel in a sentence. a covered passageway; specifically : a horizontal passageway through or under an obstruction; a subterranean gallery (as in a mine); burrow… See the full definition

Tunnel engineers, like bridge engineers, must be concerned with an area of physics known as statics.Statics describes how the following forces interact to produce equilibrium on structures such as tunnels and bridges: Tension, which expands, or pulls on, material ; Compression, which shortens, or squeezes material ; Shearing, which causes parts of a material to slide past one …