ISSN : 2233-8292
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.
(1997) 반사탄성파를 이용한 지층불연속면 탐지와 이의 공학적 응용에 관한 연구,
(2002) 반사탄성파를 이용한 터널막장 전방 파쇄대의 3차원적 예측,
(2001) Seismic Imaging Ahead of a Tunnel Face with Three-Component Geophones,
(1976) Rock Mass Classifications in Rock Engineering,
(1989) Engineering Rock Mass Classifications,
(2001) Study of the Application of VSP to Exploration Ahead of a Tunnel,