SPT hammer motion and its effect on impact energy

C. Lee, S. An, W. Woo, W. Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Standard Penetration Test (SPT) is widely used as an in-situ investigation method in geotechnical engineering in the world although the measured N-value (NF) in the field is affected by many factors due to energy losses. This paper investigates the real-time motions of the SPT hammeranvil during SPT and their effects on impact energy. The real-time hammer and anvil motions are monitored using a high-speed Digital Line-Scan Camera (DLSC) and stress waves are measured using a Pile Driving Analyzer (PDA) during SPT with a donut hammer and rope-pulley system. It is found that two types of the hammer-anvil motion exist; recontact and restrike of the hammer-anvil after primary impact are observed, depending on the soil resistance. The recontact contributes to the maximum impact energy and the sampler penetration while the restrike has no effect on either of these. Dominance of the hammer-anvil motion transits from recontact to restrike as the penetration resistance of the ground increases.

Original languageEnglish
Title of host publicationGeotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4
Pages251-256
Number of pages6
Publication statusPublished - 2013 Jan 1
Event4th International Conference on Site Characterization, ISC'4 - Pernambuco, Brazil
Duration: 2012 Sep 182012 Sep 21

Publication series

NameGeotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4
Volume1

Other

Other4th International Conference on Site Characterization, ISC'4
CountryBrazil
CityPernambuco
Period12/9/1812/9/21

ASJC Scopus subject areas

  • Geophysics
  • Geotechnical Engineering and Engineering Geology

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