corelation of Subgrade modulus and bearing capacity. 1

[zaes73]

is there any corelation of bearing capacity and subgrade modulus. if the bearing capacity is 2 ksf, then can we deduce subgrade modulus from this value ?

 

[SlideRuleEra]

See that "California Bearing Ratio (CBR) Correlation Charts", contributed by member BigH and hosted on this page of my website

http://www.slideruleera.net/contributions.html

It should have what you need.

http://www.SlideRuleEra.net

 

[shin25]

Try the following-

http://www.cement.org/buildings/subgrade_modulus.asp

 

[zaes73]

thanks a lot SlideRuleEra very usefull link.

 

[KCRatnayake]

According to Joseph E. Bowels,

Modulus of Sub-grade Reaction = S.F. x 40 x Bear. Cap.

Usually S.F. = 2.0

His book "Foundation Analysis and Design" is a useful guide in designing foundations. You'll have to consider two values (one higher and other lower) for the spring constant.

Clefcon

 

[twinnell]

Contact the project geotech or a geotech and ask him/her. Subgrade modulus has to do with soil displacement as well. If you have so much displacement under a certain bearing pressure, that correlates to the subgrade modulus for that condition.

 

[shin25]

Also, subgrade modulus is tested based on a standard size plate bearing. If the size of the footing is significantly larger than the size of the plate, the modulus needs correction.