Estimation of SPT-N and Relative Densityby Michael A. Fardis, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Massachusetts Inst. of Technology, Cambridge, Mass.,
Daniele Veneziano, (A.M.ASCE), Assoc. Prof. of Civ. Engrg.; Massachusetts Inst. of Technology, Cambridge, Mass.,
Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 10, Pg. 1345-1359
Document Type: Journal Paper
A consistent set of models is developed for inference of the relative density (Dr) from the blowcount number of the SPT (N) under both laboratory and field conditions. The model in the laboratory (reference model) is based on a large data set, which consists of essentially all available laboratory information on joint measurements of N, Dr and vertical effective stress. It takes explicitly into account errors in the laboratory determination of Dr and is of a form which makes its use particularly simple. The reference model is not directly applicable in situ. However, the model can be applied in the field after a simple, but sometimes depth dependent, modification which requires a few measurements of N and Dr at the site.
Subject Headings: Data processing | Structural models | Vertical loads | Effective stress | Joints | Information management | Job satisfaction | Field tests
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