Field testing to verify allowable design bearing pressure

[phllp]

How do DCP test results correlate to verifing allowable design bearing pressure? I know you can correlate DCP blows to a N-value which is how the orginal alowable bearing pressure is based upon along with other soil properties (phi angle(friction angle), coheision value, unit weight, etc). I have heard that a DCP is 2.5 to 3 times a a N-value. Are there any papers, publications, or standards that better descibe how to verify allowable bearing pressure in both sands and clays with DCP or hand penetrometer tests? My geotech textbook only explains how to calculate bearing capacity using terzaghi and other methods to check for settlement and bearing capacity with soil boring data but there no explaination on how to verify that allowable bearing pressure has been achieved in the field during the actual construction process.

 

[vollEngineer]

I hope I am not repeating someone - but at LEAST run correlation DCP near the borings you have SPT values for in Piedmont. I correlate DCP to SPT per site within residuum that way to make sure the senior techs aren't just waving contractors forward with a 6. I didn't read it, but I hope that it is a given when someone asks what the "equation" is for "sands and clays."