Stress Analysis for Pipeline Buried in Peat
Stress Analysis for Pipeline Buried in Peat
(OP)
Hi all,
Has anyone performed stress analysis for a pipeline buried in peat? I'm attempting a preliminary stress analysis using Caesar II and an American Lifelines Alliance soil model. Actual soil data is not yet available. Does anyone have typical soil properties for peat? Although an imported / engineered backfill may be used I would like to start by analysing pipeline behaviour in the native soil.
Thanks
Mark
Has anyone performed stress analysis for a pipeline buried in peat? I'm attempting a preliminary stress analysis using Caesar II and an American Lifelines Alliance soil model. Actual soil data is not yet available. Does anyone have typical soil properties for peat? Although an imported / engineered backfill may be used I would like to start by analysing pipeline behaviour in the native soil.
Thanks
Mark





RE: Stress Analysis for Pipeline Buried in Peat
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
or is that even easier than suspending it across peat? 8<)
RE: Stress Analysis for Pipeline Buried in Peat
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Stress Analysis for Pipeline Buried in Peat
hope this helps. Good luck!
-pmover
RE: Stress Analysis for Pipeline Buried in Peat
If the pipe is anything bigger than 6", or 6" with std wall or less, it will float without concrete coating.
The shear strength hardly has enough strength to support any negatively buoyant load.
The friction angle must be in the dry condition as, wet it is nearly fully fluidized and has a 0 friction angle.
No matter what the friction angle is, there isn't much point to try to use any material with such a low, low density.
Excavate the peat and sell it to a whiskey distilling company. Hopefully you're in Scotland.
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
Here is one of the articles I read, or shall I say "scanned briefly":
http://www.sgem.pwr.wroc.pl/n34-05/art04_n34_2005....
I was pretty tired and perhaps I should have spent some more time correctly interpreting the data. Hopefully, the OP can make use of the data from this and similar links.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
My fav is Dalwhinnie.
Carefull. If it's 8" and there's water around, it wants to float.
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
elbows always get bent in Scotland, but perhaps for different reasons than you're thinking.
rconner, OK.
Well it wasn't TOTALLY obvious.
I was there a couple of years ago and can't wait to go back.
Not for the peat.. for the REpeat.
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Stress Analysis for Pipeline Buried in Peat
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
on the Liverpool to Manchester railway. His novel solution was to use a mattress to distribute the load. Perhaps your could do the same in the trench bottom? Not sure how much Glenfiddich he had to consume to come up with that gem.
“The beautiful thing about learning is that no one can take it away from you.”
---B.B. King
http://waterhammer.hopout.com.au/
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
The Floodwood swamp in Minnesota brings back a lot of memories if you have ever been there BigInch...
RE: Stress Analysis for Pipeline Buried in Peat
"In 1830 Robert Stephenson (of "Rocket" fame to all of you who know about the history of early railways) was building a rail line between Liverpool and Manchester. The route had go over several miles of of a peat bog known as "Chat Moss". His solution was to put bails of cotton onto the moss, covered by bracken with a top layer of shale. The rail line, without substantial structural modification, is still in use today carrying regular passenger trains and some 6000 ton coal trains."
Anyone who has been around Northern Minnesota much knows that many of the at least older roads are sort of like riding on a roller coaster. I guess this is perhaps some due to differential support of the subgrade, but I've also thought may have had something also to do with sort of ice lenses formed periodically in the near always very high water content native soil (as from personal experience I know it's just so darn cold to boot!))
RE: Stress Analysis for Pipeline Buried in Peat
rc, yes the freezing ice lenses jacks up the roads wherever they form. In near permafrost, after a few thousand years, they eventually build into small hills 20 to 50 feet tall. They freeze, thaw, but not completely, then freeze again.
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
RE: Stress Analysis for Pipeline Buried in Peat
Independent events are seldomly independent.
RE: Stress Analysis for Pipeline Buried in Peat