Drill Rod Influence on Standard Penetration Test

by Ralph E. Brown, (M.ASCE),


Serial Information: Journal of the Geotechnical Engineering Division, 1977, Vol. 103, Issue 11, Pg. 1332-1336


Document Type: Journal Paper

Abstract: The many factors that affect the standard penetration test variability have been listed and examined qualitatively by Fletcher and others. One factor listed is the rod linking the split spoon sampler to the surface. Intuitively, one would expect the rod stiffness and inertia to affect the SPT resistance. Several different approaches have been used to evaluate the influence of rod type on the SPT.

Subject Headings: Rods | Penetration tests | Stiffening | Inertia | Load and resistance factor design | Drilling

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