Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
(OP)
Hello everyone,
I got a figure for approximate relationship between allowable soil bearing pressure and sub grade modulus Ks.
The figure is from my co-worker. However, he did not remember what reference it is from.
Is there anyone can help me to figure out the reference?
Thank you very much.
I got a figure for approximate relationship between allowable soil bearing pressure and sub grade modulus Ks.
The figure is from my co-worker. However, he did not remember what reference it is from.
Is there anyone can help me to figure out the reference?
Thank you very much.






RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
I did come across a Structure magazine article that discusses the subject though. Here is a link to the article:
Link
http://www.structuremag.org/?p=1239
Halfway down they start to discuss bearing capacity & subgrade mod correlation:
"The most common – and probably the safest – answer to the question of correlation between bearing capacity and the modulus of subgrade reaction is that there is no correlation. But there should be one, as both are the measurements of soil capacities and any of these two parameters can be used to design a regular foundation."
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
For example:
2000 PSF = 27.8 PCI
3000 PSF = 41.7 PCI
4000 PSF = 55.6 PCI
DaveAtkins
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
Best advice is talk with your geotechnical engineer about what kind of performance you need, your loads, and a good geotechnical engineer can give you good values. If you continue to get bad values, then you need to retain better geotechnical engineer for your projects.
Mike Lambert
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
To me, this means there IS some relationship between allowable bearing pressure and subgrade modulus. Geotechnical engineers typically limit the allowable bearing pressure to the pressure which causes 1/2" settlement. That is how I came up with my numbers.
But--I do agree the relationship is rough. A good geotechnical engineer will be able to come up with more accurate values.
DaveAtkins
RE: Approximate relationship between allowable soil bearing pressure and sub grade modulus Ks
I realize this may sound like splitting hairs, but the difference can be substantial in many soil deposits.
Mike Lambert