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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#11
September 10th 09, 12:55 PM
posted to uk.railway,uk.transport.london,misc.transport.urban-transit
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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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