In “full face” method of constructing tunnels, the first operation relates to______________?
(A) removal of bottom portion
(B) excavation of one drift in the centre
(C) removal of top portion
(D) excavation being done along the periphery
Share this... |
Facebook
|
Twitter
|
Linkedin
|
Whatsapp
|
Your email address will not be published. Required fields are marked *