Development and application of 3D migration techniques for tunnel seismic exploration

터널내 탄성파 탐사의 3차원 구조보정기법 개발 및 현장적용

  • 최상순 ((주)청석엔지니어링 지반공학부) ;
  • 한병현 (삼성물산(주) 건설부문 토목기술팀) ;
  • 김재권 (삼성물산(주) 건설부문 토목기술팀) ;
  • 이인모 (고려대학교 사회환경시스템공학과)
  • Published : 2004.09.01

Abstract

Two 3-dimensional data processing techniques to predict the fractured zone ahead of a tunnel face by the tunnel seismic survey were proposed so that the geometric formation of the fractured zone could be estimated. The first 3-dimensional data processing technique was developed based on the principle of ellipsoid, The input data needed for the 3D migration can be obtained from the 2-dimensional tunnel seismic prediction (TSP) test where the TSP test should be performed in each sidewall of a tunnel. The second 3-dimensional migration technique that was developed based on the concept of wave travel plane was proposed. This technique can be applied when the TSP is operated with sources in one sidewall of a tunnel while the receivers are installed in both sidewalls. New migration technique was applied to an in-situ tunnelling site. The 3-dimensional migration was performed using measured TSP data and its results were compared with the geological investigation results that were monitored during tunnel construction. This comparison revealed that the proposed migration technique could reconstruct the discontinuity planes reasonably well.