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"I can't see much wrong with that. Someone enlighten me if that's a problem."

FW, a couple of things, briefly, to avoid my being sniped at, as might happen.

"re-enter Silbury Hill via the tunnel dug to its centre in 1968" is a nice way of saying boring a much bigger, entirely new tunnel. Words, eh?

There's more than this press release. A big chunk of material. Arrived Friday. Press release Monday. Timing, eh?
(Still, they've taken to calling me Nigel, which is nice.)

The likely collateral damage for each option is further explained. Guess which will cause VASTLY the most collateral damage? Yep, tunnelling.

Guess which will be VASTLY the most expensive? Yep, tunnelling.

Guess which THEY have chosen? (Before showing the data to you the concerned person or me the taxpayer?) Yep, tunnelling.

Oh and as a piece de resistance, having shown that tunnelling is by far the most damaging on the basis of their ASSUMPTIONS, they then admit that the amount of collateral damage that will happen in terms of collapses adjacent to the new tunnel actually CANNOT be known!

If they put the options before a hard bitten parliamentary accounts committee that asks them to PROPERLY explain why the most damaging and most uncertain and most expensive solution is being proposed, then fine. I don't think this press release or the data that lies behind it will do it for them though.

Hi, Nigel,

At least they seem to have moved away from the shoring-up of the void spaces, recommended by their own commitee earlier this year:

http://www.english-heritage.org.uk/FileStore/about-us/pdf/ehac/EHAC_minutes_Feb05.pdf.

>*ITEM 5 – SILBURY HILL: OPTIONS FOR STABILISATION (EHAC 2005/4)
5.1 The Committee was asked to consider three options for the future of Silbury Hill following the collapse of the vertical shaft:
1) do nothing;
2) fill the voids;
3) support the voids.<

The section concludes:

>5.11 The Committee agreed that:
i)
Option 3 was preferable, more engineering advice was needed and there was no need for haste;
ii) the site should be open for monitoring purposes and in situ preservation would be one of the key strategies in future.

With regard to the retunneling of the 1968 tunnel, it could be that EH see the amalgamating of all the tunnels into one big hole as the best way to unify the backfilling progress: according to Figure 11 in the report by Canti et al at:

http://www.english-heritage.org.uk/upload/pdf/Silbury_Hill_CFAreport.pdf


both the 1849 tunnel, the 1968 tunnel, and the produced void would need to be addressed to at least the start of Silbury II.

Personally, I don't know what's best fo the Poor Bloody Hill, but at least this news seems to indicate a shift in policy in the treatment of its ailment: a shift perhaps bought about via HA muscle!


Peace

Pilgrim

X

>...they then admit that the amount of collateral damage that will happen in terms of collapses adjacent to the new tunnel actually CANNOT be known!<

I'm a little confused here Nigel. Where is this new tunnel? I don't trust EH any more than you do but the policy they seem to be advocating (re: http://www.english-heritage.org.uk/server/show/nav.8820) suggests a controlled back-filling (with chalk) of all existing vertical and horizontal tunnels (or am I missing something here?).

>is a nice way of saying boring a much bigger, entirely new tunnel. Words, eh?

eh? Entirely new tunnel?
Where did you get that idea from then?
Seems like your not going to be happy unless you are personaly in charge!