Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Assessment of Shear Band Characteristics in Granular Soils Using Digital Image Analysis Technique for Plane Strain Tests

평면변형률 시험에서 이미지 해석을 통한 사질토의 전단면 특성 평가

  • 장의룡 (서울대학교 건설환경공학부) ;
  • 정영훈 (경희대학교 토목공학과) ;
  • 김준영 (서울대학교 건설환경공학부) ;
  • 정충기 (서울대학교 건설환경공학부)
  • Received : 2010.12.28
  • Accepted : 2011.04.13
  • Published : 2011.04.30
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Abstract

Shear banding, the localization of deformation into thin zones, has a quite practical relevance, as stability and deformation characteristics of earth structures are controlled by the soil behavior within the shear band. In this study, for understanding occurrence and developed pattern of shear band, plane strain compression tests were performed on three soils with different particle-size distribution under various conditions. Digital images were captured during the experiments; then, deformation of a specimen was evaluated by digital image analysis technique. The characteristics of a shear band were evaluated from the state shortly after post-peak occurrence to critical state. Additionally, the statistical procedure was developed to determine the reasonable thickness of a shear band.

전단면의 형성과 전단면에 집중되어 국부적으로 발생하는 변형은 지반 구조물의 거동과 안정성에 크게 영향을 미치기 때문에 전단면의 특성을 파악하는 것은 매우 중요하다. 본 연구에서는 전단면의 형성 및 발달 패턴 등을 실험적으로 규명하기 위하여 입도분포가 다른 세 가지 시료에 대하여 밀도와 구속압 조건을 변화시켜가면서 평면변형률 시험을 수행하였다. 전단 중에 이미지를 촬영하고, 전단 초기에서부터 한계 상태까지 하중 단계에 따라서 이미지 해석을 수행하여 시료 내부의 변형을 측정하였다. 이를 바탕으로 전단면이 발생하기 시작하는 단계를 확인하였고, 이 단계부터 응력 연화 단계를 지나 한계 상태에 이를 때까지의 전단면의 특성을 기울기와 두께의 관점에서 평가하였다. 또한, 두께를 합리적으로 산정하기 위하여 통계적인 해석 절차도 마련하였다.

Keywords

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