Why are all tunnels not excavated via Tunnel Boring Machines?
We have TBM technology but I am hearing there are still some tunnels excavated via NATM, Drill & Blast instead of TBM. Why?Reply on topic: Bulgaria: Zheleznitsa Tunnel Construction Collapsed. 3 Workes in Hospital
This news English better than my English. I think tunnel is drill and blast method tunnelling. https://www.novinite.com/articles/205039/Rock+Mass+Collapsed+During+the+Construction+of+the+Zheleznitsa+Tunnel%2C+Three+Workers+InjuredReply on topic: Australia: Snowy Hydro refutes the claims that the TBM stopped boring
In a separate development; Sky News says Snowy 2.0 suffered partial tunnel collapse due to “drill and blast” operations in an adjacent tunnel. The part ofter 3:47 are relevant. https://youtu.be/ZY5rPjDxXGg?t=226BRO DG carries out first blast at south portal of Sela tunnel on Army Day
Border Roads Organisation (BRO) Director General travelled around 500 km by road carried out the first blast of the south portal of the Se...https://in.news.yahoo.com/bro-dg-carries-first-blast-153...Saudi Arabia selects contractors to bid for NEOM Delta Junction tunnelling works
...nelling method is described as drill and blast, cut and cover in a hard=rock...rded the mountain tunnels (all drill & blast) to two different consortiums...rock excavated as part of this tunneling project will be processed for...e sheer scope and scale of the tunneling work to be undertaken highlig...
cover tunnel photo by: Matt Brown from London, England / CC BY
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