Thread: EU lending for Crossrail
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Old September 10th 09, 12:55 PM posted to uk.railway,uk.transport.london,misc.transport.urban-transit
Basil Jet Basil Jet is offline
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Default EU lending for Crossrail
Robert wrote:

But the volume of material being excavated /does/ increase as the
square of the diameter. If the tunnel diameter is increased from 6.5
metres to 7.5 metres, a 15 per cent increase, the volume of spoil
increases by 33 per cent. (All numbers rounded).

It's actually more, because, as mentioned elsewhere, the tunnel lining gets
thicker as well.


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