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RE: subgrade modulus

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I am not really sure.  I am not a geotechnical engineer, but it has to do with the slab on grade being essentially unreinforced concrete bearing on a prepared subgrade and a small area of applied load as opposed to a large foundation being a reinforced concrete rigid element bearing directly on soil.  It also has to do with the transient loading of a slab on grade vs. more long term effects on a raft foundation. 
 
I just know enough NOT to use the subgrade modulus given in the geotech report for slab on grade when I design a mat foundation. 
 
Regards,
Harold Sprague



From: Truitt(--nospam--at)AshleyVance.com
To: seaint(--nospam--at)seaint.org
Subject: RE: subgrade modulus
Date: Thu, 27 Mar 2008 08:10:08 -0700

Harold,

 

Can you tell me why its markedly different?

 

Thanks,

 

Truitt Vance

 


From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Wednesday, March 26, 2008 9:33 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: subgrade modulus

 

This is a geotech question, but you need to let them know the application.  A subgrade modulus for a raft foundation is markedly different than a subgrade modulus for a slab on grade. 

Regards,
Harold Sprague

> Date: Tue, 25 Mar 2008 14:38:38 -0700
> From: ankiswani(--nospam--at)yahoo.com
> Subject: subgrade modulus
> To: seaint(--nospam--at)seaint.org
>
>
> can any body tell me how to calculate the subgrade
> modulus from the soil test report
>
>
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