Related terms:
new austrian tunnelling method
than copper
relief etching
printing plates
steel plates
cutter head
rock mass classification
construction method
copper plates
machine used
ferric chloride
key features
rock mass
tunnel boring machine
roughened
excavate
shotcrete
aquatint
off against
Wikipedia sources:
Etching
Tunnel boring machine
New Austrian Tunnelling method
Context for words:
soft
ground
|
|