I hope I get some information about

[abf]

I hope I get some information about bearing capacity of shallow foundations (square,circle & mat) based on N (spt value).

 

[Focht3]

Do you have a specific problem that you need help solving?

 

[cmorgh]

Using "N" value for cohesive soils is a very complicated matter. For the non-cohesive soils (I mean non-plastic) I may introduce a suitable reference as follows:
Karl Terzaghi, Ralph B. Peck, Gholamreza Mesri, 1996, "Soil Mechanics in Engineering Practice", 3rd edition,
Chapter 9, Page 402, article 50.2.8.