Journal Published Online: 01 September 1984
Volume 7, Issue 3

A Field Study of an Automatic SPT Hammer System



A field comparison is made of standard penetration test (SPT) N values obtained using three automatic free fall hammers of the same design with N values obtained by five cathead and rope operators using four different drill rigs. A comparison of mean N values using the t-statistic at the 5% significance level generally indicates no significant difference in means. The tests were performed in a loessial soil in several parallel borings. The field N values were in the range of 5 to 15.

Author Information

Riggs, CO
Central Mine Equipment Company, St. Louis, MO
Mathes, GM
John Mathes and Associates, Columbia, IL
Rassieur, CL
Central Mine Equipment Company, St. Louis, MO
Pages: 6
Price: $25.00
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Stock #: GTJ10492J
ISSN: 0149-6115
DOI: 10.1520/GTJ10492J