Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
권호 표지

Relationship between Dynamic Elastic Modulus and Lithology using Borehole Prospecting

시추공 물리탐사를 이용한 동탄성계수와 암상과의 상관성 분석

  • Park, Chung-Hwa (Department of Earth System, Engineering, Daejeon University) ;
  • Song, Moo-Young (Department of Geology, Chungnam National University) ;
  • Park, Jong-Oh (Department of Earth System, Engineering, Daejeon University)
  • 박충화 (대전대학교 지구시스템공학과) ;
  • 송무영 (충남대학교 지질학과) ;
  • 박종오 (대전대학교 지구시스템공학과)
  • Published : 2002.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

To delineate the relationship between dynamic elastic modulus and lithologies, suspension PS logging was applied to Yuseong granite, Paldang banded gneiss, and Sabuk sedimentary rock. P and S wave velocities were also measured for these lithologies. In addition, uniaxial strength and Poisson’s ratio were measured in a laboratory for Yuseong granite and Paldang banded gneiss. In laboratory measurements, P and S wave velocities in Paldang banded gneiss were higher than those in Yuseong granite whereas Poisson’s ratio in Paldang banded gneiss was lower than that in Yuseong granite. This implies that P and S wave velocities correlate reversely with Poisson’s ratio. The dynamic Young modulus obtained from suspension PS logging was high compared to the dynamic bulk modulus and the dynamic shear modulus.

유성일대 화강암, 팔당일대 호상 편마암 및 사북일대 퇴적암 지역에서 동탄성계수와 탄성파 속도와의 관계를 밝히기 위하여 완전파형음파검층을 통해 이들 암상에서 탄성파 P파와 S파 속도를 측정하였다. 또한 유성일대 화강암과 팔당일대 편마암 지역에 대해서는 일축압축강도와 포아송비를 실내시험에서 측정하였다. 실내실험 자료에서는 팔당 호상편마암 지역의 탄성파 P파 및 S파 속도가 유성의 화강암 지역보다 높게 나타난 반면, 포아송비가 낮은 값을 보이므로 포아송비의 증가함에 따라 탄성파 P파 및 S파 속도가 감소하는 상관관계를 보였다. 완전파형음파검층을 통하여 얻어진 동탄성계수는 동체적탄성계수와 동전단탄성계수에 비하여 높은 값을 보인다.

Keywords

References

  1. 대한지질학회, 1999, 한국의 지질, 시그마프레스, 890 p
  2. 박희인, 이준동, 정지곤, 1977, 1:50,000 한국지질도 유성 도폭, 한국자원연구소
  3. 송무영 , 김환석, 박종오, 2002, 시추공물리탐사를 통한 지반 물성과 암상과의 상관성 분석, 대한지질공학회지, 12(2), 127-135
  4. 한국암반공학회, 한국지구물리탐사학회, 한국자원연구소, 1999, 건설기술자를 위한 지반조사 및 시험기술, 799 p
  5. Dutta, N.R, 1984, Seimic refraction method to study the foundation rock of a Dam, Geophysical prospecting, 32, 1103-1110 https://doi.org/10.1111/j.1365-2478.1984.tb00757.x
  6. Homby, B.E., Luthi, S.M., and Plumb, R.,A., 1992, Comparison of fracture apertures computed from electrical borehole scans and reflected Stoneley waves: an integrated interpretation, The Log Analyst, 33(1), 50-66
  7. Homby, B.E. and Muiphy m W. R, 1987, Vp$_p$/V$_s$, in unconsolidated oil sands: Shear from Stoneley, Geophysics, 52, 502-513 https://doi.org/10.1190/1.1442320
  8. Kitsunezaki, C., 1980, A new method for shear-wave logging, Geophysics, 45, 1489-1506 https://doi.org/10.1190/1.1441044
  9. Ogura, K., 1988, Expansion of Applicability for Suspension P-S Logging, OYO Technical Roport, No. 10, 69-98
  10. Paillet, F.L., Cheng, C.H., and Pennington, W.D., 1992, Acoustic-waveform logging: Advancees in theory and application, The Log Analyst, 33, 239-258
  11. Sjogren, B., Ofsthus A., and Sandberg, J., 1979, Seismic classification of rock mass qualities, Geophysical prospeting, 27, 409-442 https://doi.org/10.1111/j.1365-2478.1979.tb00977.x
  12. Yoshikazu K., Shigeru M., Tadao H., and Kiyoshi M., 1997, Correlation between the results of geophysical prospecting and geotechnical properties, Soils and Foundations, The Japanese Geotechnical Society, 45(9), Ser. No. 476, 11-14 (in Japanese)