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 language | English |
|---|---|
| Title of host publication | Geotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4 |
| Pages | 251-256 |
| Number of pages | 6 |
| Volume | 1 |
| Publication status | Published - 2013 Jan 1 |
| Event | 4th International Conference on Site Characterization, ISC'4 - Pernambuco, Brazil Duration: 2012 Sep 18 → 2012 Sep 21 |
Other
| Other | 4th International Conference on Site Characterization, ISC'4 |
|---|---|
| Country | Brazil |
| City | Pernambuco |
| Period | 12/9/18 → 12/9/21 |
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ASJC Scopus subject areas
- Geophysics
- Geotechnical Engineering and Engineering Geology
Cite this
SPT hammer motion and its effect on impact energy. / Lee, C.; An, S.; Woo, W.; Lee, Woojin.
Geotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4. Vol. 1 2013. p. 251-256.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - SPT hammer motion and its effect on impact energy
AU - Lee, C.
AU - An, S.
AU - Woo, W.
AU - Lee, Woojin
PY - 2013/1/1
Y1 - 2013/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84866950559&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84866950559&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84866950559
SN - 9780415660693
VL - 1
SP - 251
EP - 256
BT - Geotechnical and Geophysical Site Characterization 4 - Proceedings of the 4th International Conference on Site Characterization 4, ISC-4
ER -