Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Strength Parameters of Cemented Sand

고결모래의 강도정수 평가

  • Lee, Hoon-Joo (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Choi, Sung-Kun (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Lee, Woo-Jin (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.)
  • 이문주 (고려대학교 건축.사회환경공학과) ;
  • 최성근 (고려대학교 건축.사회환경공학과) ;
  • 이우진 (고려대학교 건축.사회환경공학과)
  • Published : 2008.11.30
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Abstract

This study proposes the equations evaluating the shear strength of cemented sand by analytical interpretation based on Mohr-Coulomb failure criteria, and verifies them using the results of triaxial and unconfined compression tests. The internal friction angle of cemented sand is identical to that of uncemented one regardless of the stress level, while the cohesion intercept of cemented sand is constant before the breakage of cementation bonds. Therefore, the shear strength of cemented sand can be represented as a summation of the shear strength of uncemented sand and the unconfined compressive strength of cemented sand. In addition, the cohesion intercept of cemented specimen can be expressed as a function of unconfined compressive strength and friction angle. In the transition zone, assuming a constant shear strength, the equations to evaluate shear strength and cohesion intercept of cemented sand are also represented. It is observed that the predicted values using these solutions agree well with the experimental results. The experimental results also show a linear relationship between the unconfined compressive strength and the breaking point of cementation bonds.

본 연구에서는 Mohr-Coulomb 파괴기준에 따라 고결모래의 전단강도를 유도하고, 삼축 및 일축압축시험으로 검증하였다. 모래의 마찰각은 고결의 영향을 받지 않으며, 일정구속압 이하에서 고결모래의 점착력은 고결정도에 따라 일정하다. 따라서 고결모래의 전단강도는 미고결 모래의 전단강도와 고결모래의 일축압축강도의 합으로 표현되며, 고결모래의 점착력은 마찰각과 일축압축강도의 함수로 표현되었다. 또한 고결결합 파괴구속압 이후인 전이구간에서 고결모래의 전단강도는 비교적 일정하게 유지된다고 가정하여 전이구간에서 고결모래의 전단강도와 점착력을 유도하였다. 추정된 고결모래의 전단강도와 점착력은 실험결과와 잘 일치하였다. 실험 결과는 또한 고결모래의 점착력 변화에 큰 영향을 미치는 고결결합 파괴구속압이 일축압축강도와 선형비례관계임을 보여준다.

Keywords

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