An underground passageway.

Cut and Cover

A method of tunnel construction that involves digging a trench, building a tunnel, and then covering it with fill.


An ancient tunneling technique in which rock is heated with fire and then doused with cold water, causing the rock to fracture.

Rock Tunnel

A passage constructed through solid rock.

Soft-Ground Tunnel

A passage constructed through loose, unstable, or wet ground, requiring supports to keep the walls from collapsing.

Tunnel Boring Machine

A mechanical device that tunnels through the ground.

Tunnel Shield

A cylinder pushed ahead of tunneling equipment to provide advance support for the tunnel roof; used when tunneling in soft or unstable ground.

See also: Cut and Cover, Fire-Setting, Rock Tunnel, Soft-Ground Tunnel, Tunnel Boring Machine, Tunnel Shield.

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Subjects: Civil Engineering