Establishment and Verification of SPT-uphole method for Evaluating Shearwave Velocity of a site

지반의 전단파 속도 도출을 위한 SPT 업홀 기법의 확립 및 검증

  • 방은석 (한국지질자원연구원 지반안전연구부) ;
  • 김정호 (한국지질자원연구원 지반안전연구부) ;
  • 서원석 (텍사스 주립대학 토목공학과) ;
  • 김동수 (한국과학기술원 건설 및 환경공학과)
  • Published : 2008.03.28

Abstract

SPT-Uphole method was introduced for the evaluation of near subsurface shear wave velocity (Vs) profile. In SPT-Uphole method, SPT (Standard Penetration Test) which is common in geotechnical site investigation was used as a source and several surface geophones in line were used as receivers. 1D shearwave velocity profile can be obtained in the manner of downhole method, Vs distribution map which is the triangular shape around the boring point can be developed by tomography inversion. To obtain the exact travel time information of shear wave component, a procedure using the magnitude summation of vertical and horizontal components was used based on the evaluation of particle motion at the surface. It was verified that proposed method could give reliable Vs distribution map through the numerical study using the FEM (Finite Element Method) model. Finally, SPT-Uphole method was performed and the feasibility of proposed method was verified in the field.

Acknowledgement

Supported by : 한국지질자원연구원