rock mole

References

rock mole

tunneling machine

Written by

The Information Architects of Encyclopaedia Britannica

Learn about this topic in these articles:

tunnels and underground excavations
Preserving rock strength
…is the American development of rock moles that cut a smooth surface in the tunnel, thus minimizing rock damage and support needs—here limited to rock bolts connected by steel straps for this sandstone tunnel. In stronger rocks (as the 1970 Chicago sewers in dolomite) mole excavation not only largely eliminated…
Read More
…is the American development of rock moles that cut a smooth surface in the tunnel, thus minimizing rock damage and support needs—here limited to rock bolts connected by steel straps for this sandstone tunnel. In stronger rocks (as the 1970 Chicago sewers in dolomite) mole excavation not only largely eliminated…
Read More