DTR Breakroom (Let it snow, let it snow, let it snow!) 12.06.2009-12.12.2009
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DTR's Locomotive Superhero and the DTR Sweet Tea Specialist
Joined: Jul 2004
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From: Valparaiso, IN
Caught on to that a while ago.

I thought that was a pre-requisite to being in the breakroom!Sounds like someone needs to enrole into Chaikwa's Sarcastic Apprenticeship
I live in a very well drained area, very sandy soil with glacier till for sub base material, in fact this material is perfect for backfill with a proctor of around 147.0. But yes PF can go very deep and is a big pain to dig thru, it’s as hard as concrete. I had a crew I was watching last summer they had to dig a trench thru this area that had been hydro axed and was frozen for hundreds of years if not thousands. It took them 10 hours a day for a week with a backhoe and frost bucket to dig 200 feet, 6 foot deep.
I live in a very well drained area, very sandy soil with glacier till for sub base material, in fact this material is perfect for backfill with a proctor of around 147.0. But yes PF can go very deep and is a big pain to dig thru, it’s as hard as concrete. I had a crew I was watching last summer they had to dig a trench thru this area that had been hydro axed and was frozen for hundreds of years if not thousands. It took them 10 hours a day for a week with a backhoe and frost bucket to dig 200 feet, 6 foot deep.
Does the perma-frost get deeper with every year or does it reach a maximum depth at some point?chaikwa.
I grad-u-ated frum Claudes skool of tpying....
Joined: Jan 2009
Posts: 467
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From: white trash junction
That's pretty interesting stuff Paul, thanks! I'd like to see that tho, 'just because'. But if I were the operator of the backhoe I think I'd have been bored after the first couple of feet!
Does the perma-frost get deeper with every year or does it reach a maximum depth at some point?
chaikwa.
Does the perma-frost get deeper with every year or does it reach a maximum depth at some point?chaikwa.
some good info Here. Page down to
"Time to form deep permafrost"
Time taken for permafrost to reach depth Permafrost
Time (yr) Depth (m)
1 4.44 (0.002759 mi.)
350 79.9 (0.049648 mi.)
3,500 219.3
3,5000 461.4
100,000 567.8
225,000 626.5
775,000 687.7
wiki has some good info Here.



chaikwa.
Thread Starter
DTR's Locomotive Superhero and the DTR Sweet Tea Specialist
Joined: Jul 2004
Posts: 2,883
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From: Valparaiso, IN


