한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제23권5호
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  • Pages.143-151
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  • 2007
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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응력조건에 따른 고결모래의 강도정수 평가

Effect of Stress Level on Strength Parameters of Cemented Sand

  • 이문주 (고려대학교 사회환경시스템공학과) ;
  • 최성근 (고려대학교 사회환경시스템공학과) ;
  • 추현욱 (고려대학교 사회환경시스템공학과) ;
  • 조용순 (고려대학교 사회환경시스템공학과) ;
  • 이우진 (고려대학교 사회환경시스템공학과)
  • Lee, Moon-Joo (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Choi, Sung-Kun (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Choo, Hyun-Wook (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Cho, Yong-Soon (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Lee, Woo-Jin (Dept. of Civil and Environmental Engrg., Korea Univ.)
  • 발행 : 2007.05.31
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초록

고결모래의 거동은 고결정도, 상대밀도, 응력조건, 그리고 입자특성 등에 의해 영향을 받으며, 특히 고결모래의 강도에 영향을 끼치는 고결결합은 응력에 의해 파괴되기 때문에 고결모래의 강도정수는 응력조건을 고려하여 평가되어야 한다. 일반적으로 고결모래의 마찰각은 고결결합에 의해 영향을 받지 않기 때문에 미고결 상태의 마찰각과 동일한 반면, 점착력은 고결결합에 의해 증가하는 것으로 알려지고 있다. 따라서 본 연구에서는 석고를 고결유발제로 하는 고결시료를 조성하여 다양한 구속압 조건에서 배수전단시험을 실시함으로써, 구속압 변화에 따른 고결모래의 강도정수를 평가하였다. 실험결과 고결모래의 점착력은 고결정도와 구속압의 크기에 따라 고결지배구간, 천이구간, 응력지배구간에서 다르게 평가되었다. 또한 본 연구에서는 고결결합을 파괴시키지 않고 강도정수를 평가하기 위한 적정 구속압을 결정하기 위해 고결정도를 표현하는 일축압축강도와 고결결합을 파괴시키지 않는 최대 구속압의 관계를 결정하였다.

The factors affecting the geotechnical properties of cemented sands are known to be relative density, cementation level, stress level, and particle characteristics such as particle size, shape and surface conditions. It has been widely accepted that the friction angle of cemented sands is not affected by cementation while the cohesion of cemented sands was significantly influenced by cementation. The cementation that is a critical component of the strength of cemented sands will be broken with increasing confining pressure and great caution is required in evaluating the cohesion of cemented specimens due to their fragilities. In this study, a series of drained shear tests were performed with specimens at various cementation levels and confining stresses to evaluate the strength parameters of cemented sands. From the experiments, it was concluded that the cohesion intercept of cemented sand experiences three distinctive zone(cementation control zone, transition zone, and stress control zone), as the cementation level and the confining stress varies. In addition, for accurate evaluation of the strength parameters, the level of confining stress triggering the breakage of cementation bond should be determined. In this study, the relationship between the maximum confining stresses capable of maintaining the cementation bond intact and unconfined compression strength of the cemented sand was established.

키워드

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