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RE: Garage surcharge

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I don't think that adding a fictitious 2 feet of soil is equivalent to a
surcharge of 200 to 250 PSF.

If the Equivalent Fluid Pressure (EFP) is 30 PCF and the soil density is 120
PCF, two feet of earth is equal to 60 PSF of surcharge. The same results can
be obtained using Ka x gamma.

Regards,

T. William (Bill) Allen, S.E. (CA #2607)

-----Original Message-----
From: Dmitri Wright [mailto:dmitri(--nospam--at)pciengineers.com] 
Sent: Wednesday, June 30, 2004 9:39 AM
To: Seaint
Subject: Re: Garage surcharge

Joe,

A "rule of thumb" method I have seen used by many engineers (and that I use
myself) is to add a fictitious 2 feet of soil to the retained soil.  This
works out to a 200 to 250 psf distributed surcharge depending on your soil
density.  I don't think this is in any code, but it is quick and easy, and
can be justified by soil stress distribution theories if necessary.

Dmitri Wright, PE
Progressive Consultants Inc.



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