Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Relationship Analysis of Volumetric Water Content According to the Dielectric Constant for Stability Analysis of Ground Excavation

굴착의 안정성에 미치는 영향인자 분석을 위한 전자기적 유전상수와 체적함수비와의 상관관계 분석기법 연구

  • Han, Yushik (Geotechnical Engineering Research Institute, Korean Geotechnical Society) ;
  • Sohn, Hee Jeung (Geotechnical Engineering Research Institute, Korean Geotechnical Society) ;
  • Yoo, Ki Cheong (Geotechnical Engineering Research Institute, Korean Geotechnical Society)
  • 한유식 (한국지반공학회 지반공학연구소) ;
  • 손희정 (한국지반공학회 지반공학연구소) ;
  • 류기정 (한국지반공학회 지반공학연구소)
  • Received : 2016.08.18
  • Accepted : 2016.08.26
  • Published : 2016.08.31
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Abstract

In order to prevent ground collapses by groundwater level drawdown, we need to understand the groundwater flow and also make an analytical approach to the cause of the collapses. In this study, we used the result of the soil lab tests to compare and review the suitability of the various interaction equations about the relation between volumetric water content and the dielectric constant. In addition, using GPR (Ground-Penetrating Radar), we reviewed the possibility of calculating an estimate of dielectric constant. Lastly, we applied seepage analysis and stress-strain analysis to the sandy ground given by ground excavation. In comparison with the previous result of the soil lab tests, we similarly predicted the suction of unsaturated soil from results of stress-strain analysis considered the seepage force for the unsaturated soil.

지반 굴착에 따른 지하수위 저하로 인해 발생되는 지반함몰 문제는 지하수 흐름에 대한 이해를 바탕으로 한 해석적인 접근이 필요하다. 이 연구에서는 실내 토질시험 결과를 이용하여 유전상수와 체적함수비 상관식에 대한 여러 경험식의 적합성을 비교 검토하였으며, 수치연산을 통해 GPR 탐사를 이용한 유전상수 추정방법에 대해 검토하였다. 사질토 지반에 대해 굴착에 따른 침투해석과 응력-변형률 해석을 실시하였으며, 기존 실내실험 연구결과와 비교한 결과, 불포화토에 대한 침투압을 고려한 응력해석 결과에서 불포화지반의 모관흡입력 값을 유사하게 예측하였다.

Keywords

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