TECHNICAL NOTES
Jul 1, 1996
Influence of Hammer Type on SPT Results
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VIEW THE REPLYAuthors: Elliott E. Drumright, Associate Member, ASCE,, Charles W. Pfingsten, Member, ASCE,, and Robert G. Lukas, Member, ASCE Author Affiliations
Publication: Journal of Geotechnical Engineering
Volume 122, Issue 7
Abstract
The case of a relatively uniform sand site in Chicago is presented. Standard penetration test (SPT) values from samples driven using a drilling rig equipped with an automatic hammer were consistently lower than those from samples driven using a safety hammer. This is due to the higher efficiency of the automatic hammer, which results in greater energy delivered per blow. When averaged at each depth, the results indicated that SPT values using an automatic sampling hammer were approximately 75% of those recorded using the older-style safety hammer. The trend was consistent throughout the sand profile. This agrees with previously published relationships that indicate SPT results using automatic hammers can be expected to be approximately two-thirds of those recorded using safety hammers.
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Reference
1.
Kovacs, W. D. (1994). “Effects of SPT equipment and procedures on the design of shallow foundations on sand.”Proc., Settlement '94, ASCE Geotech. Spec. Publ. No. 40, Vol. 1, ASCE, New York, N.Y., 121–131.
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Copyright © 1996 American Society of Civil Engineers.
History
Published online: Jul 1, 1996
Published in print: Jul 1996
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Elliott E. Drumright, Associate Member, ASCE,
Profl. Engr., Eckland Consultants, Inc., 3 Pkwy. North, Ste. 100, Deerfield, IL 60015; formerly, Sr. Proj. Engr., STS Consultants, Ltd., Deerfield, IL.
Charles W. Pfingsten, Member, ASCE,
Prin. Engr., STS Consultants, Ltd., 1415 Lake Cook Rd., Deer- field, IL.
Robert G. Lukas, Member, ASCE
Pres., Ground Engineering Consultants, 350 Pfingsten Rd. No. 106, Northbrook, IL 60062.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.