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Colin Rosenstiel · July 24th 08, 05:04 PM posted to uk.transport.london

In article ,
(Tom Anderson) wrote:

Anyway, the upshot of all that is that, with the possible exception
of the far eastern end of the core tunnel, there isn't a geological
constraint on depth. It's clearly possible to tunnel through the
Lambeth Group, as that happens in the east, so i see no reason why
that wouldn't be possible in the west. I assume the real constraint
is therefore the presence of specific awkward things underground,
which are not shown on those maps.

I guess the costs of tunnelling in clay and Lambeth Group could be rather
different. Wouldn't you need compressed air and/or chemical consolidation
in the latter case?

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Colin Rosenstiel