Analytical Studies for SASW Measurements Underwater

  • Lee, Byung-Sik (Member, Full Time instructor Department of Civil Eng., Kongj u National University)
  • Published : 1997.06.01

Abstract

Analytical studies were conducted to develop the Spectral-Analysis-of-Surface-Waves (SASW) method for underwater use. For the precise estimation of the in-situ soil stiffness profile from SASW measurements, it is essential to determine economical and reasonable theoretical dispersion curves reflecting various experimental conditions. In this paper, therefore, analytical methods are mainly discussed, which were developed to determine theoretical dispersion curves of surface waves propagated along the soil-water interface. Application of the analytical methods is then illustrated by an example involving estimation of a stiffness profile through a forward modeling process of SASW measurements. Applicabilities of the SASW method as well as the developed analytical methods are evaluated, respectively, from the example.

주파수영역 표면파기법 (SASW)을 수중지반탐사에 적용하기 위한 일련의 해석적 연구가 실시되었다. SASW실험으로 지반강도분포를 정밀히 예측하기 위해서는 실험조건, 고차모드의 영향, 응답파의 정리 기법 등, 실험결과에 영향을 미치는 모든 제반 요소들을 고려한 정확하고도 경제적인 이론분산곡선을 결정해야만 한다. 따라서, 본 논문에서는 수중 표면파의 이론분산곡선을 구하기 위한 해석기법들을 개발하고 그 이론적 배경을 설명하였다. 또한, 개발된 해석기법들을 수중지반에서 실제로 실시된 SASW실험결과의 분석에 적용하여 수중지반의 강도특성을 예측하는 예를 보였다. 이 결과로부터 개발된 해석기법들과 더불어서 수중지반탐사를 위한 SASW 실험방법의 적용성이 검토되었다.

Keywords

References

  1. Elastic Waves in Layered Media Ewing M.W.;W.Jardetzky;F.Press
  2. Bulletin of Seismological Society of America v.71 no.6 Stiffness Matrices for Layered Soils Kausel E.;J.M.Roesset
  3. Ph.D.Dissertation, The University of Texas at Austin Analytical Studies of Surface Wave Propagation along the Seafloor for Appicaiton to Spectral Analysis of Surface Waves (SASW) Lee Byungsik
  4. Ph.D.Dissertation, The University of Texas at Austin In Situ Measurement of Stiffness Profiles in the Seafloor Using the Spectral Analysis of Surface Waves (SASW) method Luke B.A.
  5. Trasportation Research Record v.1070 Use of Surface Waves in Pavement Evaluation Nazarian S.;K.H.;Stokoe Ⅱ.
  6. Proceedings Offshore Technology Conference. Experimental Investigation of Surface Wave Velocities in Simulated Ocean Bottoms Like B.A.;K.H.Stokoe Ⅱ.;S.G.Wright;J.M.Roesset;B.Lee
  7. Soil mechanics and Foundation Engineering v.1 In Situ Seismic Testing with Surface Waves Stokoe K.H.Ⅱ.;G.J.Rix;S.Nazarian
  8. Dynamic Geotechnical Testing Ⅱ,STP 1213, American Society for Testing and materials SASW Measurements at Sites Overlaid by Water Wright S.G.lK.H.Stokoe Ⅱ.;J.M.Roesset