Evaluation of near surface Vs distribution by using SPT uphole method

SPT 업홀기법을 이용한 지반의 2차원 전단파 속도 분포 도출

  • Kim, Dong-Soo (Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Bang, Eun-Seo (Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jong-Tae (Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • 김동수 (한국과학기술원 건설 및 환경공학과) ;
  • 방은석 (한국과학기술원 건설 및 환경공학과) ;
  • 김종태 (한국과학기술원 건설 및 환경공학과)
  • Published : 2005.09.01

Abstract

SPT-Uphole tomography method was introducedand verified in this paper. In SPT-Uphole method, SPT (Standard Penetration Test) which is common in site investigation, was used as a source and several surface geophones in line were used as receivers. Shear wave velocity (Vs) distribution map which has triangular shape around the boring point can be obtained by tomography inversion. The factors for obtaining reliable result of SPT-Uphole tomography are exact travel time information and accurate inversion method. To establish of the SPT-Uphole tomography procedure, the most reliable method for obtaining exact travel time information and verification of tomography inversion method were studied by using theoretical travel time information and finite element method (FEM) analysis. finally, SPT-Uphole tomography method was performed at the weathered soil site in Kimje. By comparing with several boring data including SPT-N value, feasibility of this method was verified in the field.