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Grade beam soil pressures
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Source：Internet Author：Unknow Pubdate：2010-06-12
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PSU08 (Structural)
11 Jun 10 8:02
I am design multiple grade beams running between spreadfooters. The spreadfooters are for building columns which are isolated from the mat foundation that I am also design. So the spreadfooters and grade beams are the perimeter of the mat.
The spreadfooters go below the frost depth (2m) and the grade beams are just in place for the mat foundation, obvioulsy I can't make the mat 2m thick for the frost depth.
My question is should I apply the at-rest pressure to both sides of the grade beam, or apply at-rest pressure on one side and active or passive on the other side??
Thank you
dcarr82775 (Structural)
11 Jun 10 15:44
Can you thicken the mat around the edge? If not, is that the only portion of the mat that will be on fill?
字串8
Ron (Structural)
11 Jun 10 18:26
First...they are "footings" not "footers". Next, why are you concerned about lateral earth pressure when the structural member is only 1 or 2 meters below grade? The lateral pressure is negligible compared to the other loads.
PEinc (Geotechnical)
11 Jun 10 20:28
Also, doesn't a grade beam usually have about equal backfill on each side? Therefore, little or no lateral earth pressure? www.PeirceEngineering.com
paddingtongreen (Structural)
11 Jun 10 23:30
There is the construction condition when they often backfill and tamp the inside so they can go ahead with the slab, and follow up on the outside later. Michael.
Timing has a lot to do with the outcome of a rain dance.
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