implies to me a long-term deformation, whereas the modulus relates to
short-term deformation. I would say the formula is:
applied bearing pressure/immediate soil deformation = modulus of
subgrade reaction
It also should be noted that the modulus is typically based on a
standard test with a plate of a particular size. The modulus must be
adjusted based on actual bearing area.
Bill Sherman
CH2M HILL / DEN
720-286-2792
-----Original Message-----
From: Bob Freeman [mailto:robert.freeman@idsse.com]
Sent: Tuesday, March 25, 2008 3:47 PM
To: seaint@seaint.org
Subject: RE: subgrade modulus
Abdolnasir:
The best way is to ask the Geotechnical engineer.
The formula is:
bearing pressure/settlement = coefficient of Subgrade Reaction (subgrade
modulus). k sub s = q/delta
Respectfully,
Bob Freeman, AIA, EIT
IDS Group, Inc.
(949) 387-8500
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