S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Civil & Environmental Engineering (건설환경공학부) Theses (Master's Degree_건설환경공학부)
Assessment of Shear Band Characteristics in Cohesive Soils using Plane Strain Test with Digital Image Analysis
평면변형률 시험에서 디지털 이미지 해석을 통한 점성토에서의 전단면 특성 평가
- 공과대학 건설환경공학부
- Issue Date
- 서울대학교 대학원
- "Plane strain test"; "Digital image analysis"; "Strain distribution"; "Deformation condition"
- 학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 2. 정충기.
- Soil failure which affects the stability and deformation characteristics of structures is relevant to settlement by consolidation, and shear banding, the localization of deformation into thin zones. However, most of the existing researches for plane strain tests were performed with granular soils to evaluate those spatial deformations. Little research has been conducted with cohesive soils
even the existing research has no regard to spatial deformation, only considering the entire deformation which is measured by the conventional method (LVDT). Moreover, cohesive soils show significant heterogeneous deformation behaviors due to the non-uniform distribution of stress. Accordingly, the understanding of the characteristics of spatial deformation during consolidation and shear process is necessary as well as the assessment of stress-strain response of the soil. In this paper, digital image analysis technique with the advantage of high resolution for deformation at any point of a soil was adopted to evaluate the consolidation behavior and shear band characteristics of normally consolidated clays. Overall stress-strain behavior from initial to post peak has been analyzed together with spatial distributions of deformations from digital images at 5 distinct loading intervals. Failure mechanism and strain softening is strongly related to the shear band forming and evolution.