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Geotechnical and Geological Engineering
Erschienen in: Geotechnical and Geological Engineering 2/2017

19.12.2016 | Technical note

SPT Energy Measurements: Manual vs. Automatic Hammer Release

verfasst von: A. V. Batilas, P. C. Pelekis, P. G. Roussos, G. A. Athanasopoulos

Erschienen in: Geotechnical and Geological Engineering | Ausgabe 2/2017

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Abstract

The results of SPT measurements performed at five locations in Greece with varying stratigraphy, using manual or automatic hammer release along with ~900 recordings of the impact energy transmitted to the string of rods, are presented. The measured values of energy ratio (ER) and associated uncertainty (standard deviation, σ, and coefficient of variation, COV) are the first to be reported regarding the Greek practice of test. The results were analyzed in terms of hammer release technique, depth, soil type and blow count (NSPT) and they were compared to pertinent published results. It was found that the ER and related uncertainty values depend mainly on the hammer release technique, and the following values are proposed for practical use under soil conditions similar to the ones encountered in the present study: ERman. = 46 ± 3.8% and ERauto = 77 ± 4.6%.
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Metadaten
Titel
SPT Energy Measurements: Manual vs. Automatic Hammer Release
verfasst von
A. V. Batilas
P. C. Pelekis
P. G. Roussos
G. A. Athanasopoulos
Publikationsdatum
19.12.2016
Verlag
Springer International Publishing
Erschienen in
Geotechnical and Geological Engineering / Ausgabe 2/2017
Print ISSN: 0960-3182
Elektronische ISSN: 1573-1529
DOI
https://doi.org/10.1007/s10706-016-0138-z

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