Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Application of Geophysical Exploration Technique to the Identification of Active Weak Zones in Large Scale Mountainous Region

대규모 산지지반 활동연약대 규명을 위한 지구물리탐사기법의 활용 연구

  • Shin, Hyung Ohk (Forest Engineering Research Institute, Forest Technology Division, National Forestry Cooperative Federation) ;
  • Kim, Man-Il (Forest Engineering Research Institute, Forest Technology Division, National Forestry Cooperative Federation) ;
  • Yoon, Wang Joong (Department of Energy & Resources Engineering, Chonnam National University)
  • 신형옥 (산림조합중앙회 산림종합기술본부 산림공학연구소) ;
  • 김만일 (산림조합중앙회 산림종합기술본부 산림공학연구소) ;
  • 윤왕중 (전남대학교 에너지자원공학과)
  • Received : 2018.07.25
  • Accepted : 2018.08.10
  • Published : 2018.08.31
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Abstract

The purpose of this study is to understand the ground change of large scale mountainous region and to estimate the active weak zone using geophysical exploration (electrical resistivity and refraction seismic explorations) in large scale deep landslide area located in Wanjugun, Jeollabukdo. We also analyzed the characteristics of deep landslides occurred in metamorphic rocks region and confirmed the approximate scale. As a result of comparative analysis of N-value by standard penetration test (SPT), low resistivity anomaly, and tension crack identified from field investigation, a discontinuity in soil layer was estimated at 10 ~ 15 m below the surface. Based on this results, the distribution pattern of active weak zone was confirmed between the discontinuity in soil layer and estimation line of bedrock.

본 연구는 전라북도 완주군 ${\bigcirc}{\bigcirc}$지역에서 발생한 대규모 땅밀림 산사태 지역에서 지구물리탐사(전기비저항 탐사, 굴절법 탄성파탐사) 기법을 활용하여 대규모 산지지반 변화를 파악하고 활동연약대를 추정하고자 수행 하였다. 또한 변성암 지역에서 발생한 땅밀림 산사태 특성을 파악하고, 대략적인 규모를 파악하였다. 표준관입시험으로 얻어진 N치와 전기비저항 탐사의 저비저항 이상대, 지표지질조사로 얻어진 인장균열 위치를 비교 분석한 결과, 지표하부 10 ~ 15 m 사이에 형성되어 있는 토사층에 존재하는 불연속면을 추정하였다. 이를 토대로 토사층의 불연속면과 연구결과로 얻어진 기반암의 추정선 사이의 활동연약대 분포를 확인하였다.

Keywords

References

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