On 04/06/2015 16:14, Basil Jet wrote:

On 2015\06\04 15:58, Mizter T wrote:

On 04/06/2015 09:43, Jim Chisholm wrote:
So reports BBC:
http://www.bbc.co.uk/news/uk-england-london-33002819

"Tunnelling work in London has been completed in the £14.8bn Crossrail
scheme.
Eight boring machines have been cutting their way through earth to
create 26 miles (42km) of tunnels."


AFAIAA, there haven't been any tunnelling mishaps, which is perhaps
worthy of note and acclaim.

What would a "tunnelling mishap" be? I remember the NATM problem at
Heathrow, but that was surely a rare incident.


There was a significant tunnelling collapse in Stratford during the
boring for the CTRL tunnels.

Were there not some issues with 'Big Ben' leaning over a bit too much
during the JLE construction and needing extra underpinning?

Also I've read something about some urgent phone calls being made from
King's College at Aldwych to LT because of some ground movement when the
original Jubilee line was being bored (of course that stretch was never
used in the end).