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Re: Subgrade Modulus for Mat Foundations

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The typical geotechnical recommendations for large mats would include guidance for allowable soil bearing, potential total and differential settlement, and an appropriate modulus of subgrade reaction suitable for the engineer to develop one way soil springs for a computer model.  For large mats the trick is normally in providing the correction factors for size effects as oppose to just reporting the 1 foot by 1 foot plate test results.  Typically soil bearing is given in either ksf or psf, settlement in inches, and MSR in kcf, kci, or pci.

Thomas Hunt, S.E.

"Souther, Joseph" <SoutherJT(--nospam--at)>
01/29/2009 10:00 AM
Please respond to seaint
Subgrade Modulus for Mat Foundations

As a geotechnical engineer, I wish to provide geotechnical design parameters to the structural engineer for design of a large (100 to 200 foot) circular mat foundation. What parameters does the structural expect? What units (US job) are used for the design?


Joseph T Souther, PE

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