Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2009.03a
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- Pages.84-90
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- 2009
Logging for a Stone Column Using Crosshole Seismic Testing
크로스홀 탄성파 시험을 이용한 쇄석다짐말뚝의 검측
- Kim, Hak-Sung (Dept. of Civil Eng., Kyunghee Univ.) ;
- Park, Chul-Soo (Railroad Structure Research Department, Korea Railroad Research Institute) ;
- Lee, Tae-Hee (Dept. of Civil Eng., Kyunghee Univ.) ;
- Mok, Young-Jin (Dept. of Civil Eng., Kyunghee Univ.)
- Published : 2009.03.27
Abstract
An integrity testing for stone columns was attempted using crosshole S-wave logging. The method is conceptionally quite similar to the crosshole sonic logging (CSL) for drilled piers. The critical difference in the logging is the use of s-wave rather than p-wave, which is used in CSL, because s-wave is the only wave sensing the stiffness of slower unbounded materials than water. An electro-mechanical source, which can generate reversed S-wave signals, was utilized in the logging. The stone column was delineated from the S-wave travel times across the stone column, and taking S-wave velocities of the crushed stone and surrounding soil into account. The volume calculated from the diametrical variance delineated is very close to the actual quantity of the stone filled.
Keywords
- granular compaction pile;
- rammed aggregate piers;
- crosshole tests;
- shear wave velocity;
- diametric variation