Converting a CBR Value into a Modulus of Subgrade Reaction
Converting a CBR Value into a Modulus of Subgrade Reaction
(OP)
As the title states I am looking to convert the CBR value of a poorly graded sand and gravel into a modulus of subgrade reaction to be used in foundation design (not pavement design). I have found some information related to this while searching through this forum and others, however I am finding it difficult to find specific references for CBR to k for foundations.
The average CBR for the material at 95% Modified Proctor density is 30 (measured at 0.2").
The average CBR for the material at 95% Modified Proctor density is 30 (measured at 0.2").





RE: Converting a CBR Value into a Modulus of Subgrade Reaction
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Converting a CBR Value into a Modulus of Subgrade Reaction
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Converting a CBR Value into a Modulus of Subgrade Reaction
RE: Converting a CBR Value into a Modulus of Subgrade Reaction
The "k" value used for foundation design is about 1/4 of the "k" used for pavement design.
A "k" value of 50pci is actually a relatively high value, whereas a "k" value for pavement modulus of subgrade reaction would be on the order of 150 to 200, in similar soils.
RE: Converting a CBR Value into a Modulus of Subgrade Reaction
RE: Converting a CBR Value into a Modulus of Subgrade Reaction
RE: Converting a CBR Value into a Modulus of Subgrade Reaction