ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 6

A Field Study of an Automatic SPT Hammer System

Riggs, CO
Research engineer and president, Central Mine Equipment Company, St. Louis, MO

Mathes, GM
Vice-president, John Mathes and Associates, Columbia, IL

Rassieur, CL
Research engineer and president, Central Mine Equipment Company, St. Louis, MO

Abstract

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.

Keywords:
auger borings, drilling, foundation investigations, geological investigations, loess, penetration resistance, penetration tests, sampling, soil investigations, soundings, split spoon

Paper ID: GTJ10492J
DOI: 10.1520/GTJ10492J
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