Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Comparison of dynamic and static methods in the measurement of the initial stiffness of soil

동적 및 정적 실험 방법으로 평가한 지반의 초기 강성 비교

  • Choo, Jin-Hyun (Dept. of Civil and Environmental Eng. Seoul National University) ;
  • Jung, Young-Hoon (Underground Structure Research Division, Korea Institute of Construction Technology) ;
  • Chung, Choong-Ki (Dept. of Civil and Environmental Eng., Seoul National University)
  • 주진현 (서울대학교 건설환경공학부) ;
  • 정영훈 (한국건설기술연구원) ;
  • 정충기 (서울대학교 건설환경공학부)
  • Published : 2009.03.27
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Abstract

A comparative study on dynamic and static measurement of initial stiffness was conducted. Because soil stiffness decreases even at very small strains, the initial stiffness has been measured by dynamic tests using shear wave velocity measurement. On the other hand, due to the advance of local strain measurement, the triaxial testing device is capable of measuring the static initial stiffness. It has been known that initial stiffness measured by static triaxial tests is generally lower than that measured by dynamic tests possibly due to the limitation of static measurement of displacement at very small strains. This study presents experimental results indicating that the elastic shear moduli could be the same both in dynamic and static measurements owing to the soil anisotropy induced by anisotropic stresses.

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