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Re: Frozen soil = disturbed earth?

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Another approach was used in the hangar I designed for NARL, Barrow AK a million years ago, in which the offices were elevated a few feet above the ground on wooden piles frozen into the permafrost) and the floor of the unheated (or minimally heated) hangar itself was humped up three feet in the center, with metal landings mats as the flooring, figuring that it would slowly settle.  I don't know if that has happened as predicted since it was built 40+ years ago.

Ralph Hueston Kratz, S.,E.
Richmond CA USA

In a message dated 3/23/09 9:31:23 PM, spraguehope(--nospam--at) writes:
That is similar to what is done for the pipeline.  They keep the frozen soil frozen. 

Regards, Harold Sprague

> Date: Mon, 23 Mar 2009 11:42:15 -0800
> From: dmorris(--nospam--at)
> To: seaint(--nospam--at)
> Subject: Re: Frozen soil = disturbed earth?
> Typically the concrete is protected by insulation blankets with heated
> air blown in. I was at a foundation job in Deadhorse at -20 degrees (F)
> and they had a movable heated shed that would move along the foundation
> line allowing the gravel pad that was placed upon the native soil to
> thaw and allow the foundation to be placed. The concrete would cure in
> the shed for a few days and then the shed would be moved along and the
> blankets and heated blown air added for another few days. The gravel
> pad (2 or more feet) and insulation is added to separate the native
> frozen soil from the heated building pad. Over time, the building will
> transmit heat to the permafrost and settlement will occur. To prevent
> this, air ducts are placed in the gravel pad to circulate cold air in
> the winter to keep the pad cold enough to prevent thawing of the native
> soil.
> Harold Sprague wrote:
> > Is the concrete protected from freezing?
> >
> > Regards, Harold Sprague
> >
> >
> >
> > > From: jkeyser(--nospam--at)
> > > To: Seaint(--nospam--at)
> > > Date: Mon, 23 Mar 2009 08:19:17 -0800
> > > Subject: Re: Frozen soil = disturbed earth?
> > >
> > > The majority of our projects are in rural Alaska, and as such are
> > typically supported by permafrost. The key to this issue is the last
> > paragraph of IBC Section 1805.2, "Footings shall not bear on frozen
> > soil unless such frozen condition is of permanent character."
> > >
> > > Jared
> > >

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