Tunnel boring machines (TBMs) are very picky about the rocks they chew through. This is why geologists must monitor the rock at the head of every tunnel. On good days, TBMs can bore through rock ...

Tunnel boring machines (TBMs) prefer to chew rocks, not mud. Besides, they can't support the wet ground, so the tunnel walls are collapsing! TBMs work much better in rock tunnels. Try this ...

They consist of a rotating cutting wheel fitted to a series of thrusting mechanisms and conveyors used to advance the machine forward. They can also be referred to as a mole. Tunnel boring machines ...