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Silbury's structural integrity
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whipangel
137 posts

Re: Silbury's structural integrity
Aug 01, 2007, 19:16
nigelswift wrote:
...In the first half of the tunnel the voiding is said to be no more than 0.5 metres above Atkinson’s steel support arches...


I thought 0.5m was the 'overbreak', the waterlogged crumbly material which 0.5m above would become solid roof again. Not that they should go breaking it off!

http://www.english-heritage.org.uk/upload/pdf/Silbury_Hill_web_update_11.pdf

nigelswift wrote:
...One thing that makes me think “big” might mean “very big” is that I’ve heard, rightly or wrongly, that the Atkinson rings far in (of which no account or photographs have been provided) are badly distorted. To me, that suggests massive forces. Confirmation that I have been misinformed would be very helpful...


I can confirm from my own phone call to EH that mention was made of the Atkinson supports being distorted under the pressures - they were going to have to add their own safety measures as they could no longer rely on these to protect those working on the project.


http://www.themodernantiquarian.com/forum/?thread=41033&message=530317
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