한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제35권9호
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  • Pages.5-13
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  • 2019
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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연속 가압 함수특성 시험 평가에 관한 연구

Assessment of Continuous Pressurization Method for Soil-water Characteristic Curve

  • 박현수 (단국대학교 토목환경공학과) ;
  • 김병수 (오카야마 국립대학교) ;
  • 이어령 (단국대학교 토목환경공학과) ;
  • 박성완 (단국대학교 토목환경공학과)
  • Park, Hyun-Su (Dept. of Civil & Environment Engineering, Dankook Univ.) ;
  • Kim, Byeong-Su (Graduate School of Environment & Life Science, Okayama Univ.) ;
  • Lee, Eo-Ryeong (Dept. of Civil & Environment Engineering, Dankook Univ.) ;
  • Park, Seong-Wan (Dept. of Civil & Environment Engineering, Dankook Univ.)
  • 투고 : 2019.02.28
  • 심사 : 2019.09.09
  • 발행 : 2019.09.30
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초록

함수특성 곡선은 불포화 지반의 침투 또는 전단 거동 예측을 위해 필요한 입력 변수 중 하나이며, 불포화 함수특성의 이력현상에 따라 다른 거동을 보이기 때문에 건조과정과 습윤과정이 고려되어야 한다. 보편적으로 단계적 가압식을 이용하여 함수특성 곡선을 획득하지만, 함수특성 곡선의 건조과정과 습윤과정을 모두 측정하기 위해서는 오랜 시간 소요된다는 단점이 있다. 연속 가압시험법은 이러한 단점이 개선되었으며, 기존의 시험 방법보다 측정시간이 크게 단축되는 결과가 나타났다. 하지만, 새롭게 제안된 연속 가압시험법의 결괏값에 대한 검증이 부족한 상황이다. 이에 본 연구에서는 연속 가압방법으로 획득한 함수특성 곡선을 기존의 시험법인 단계 가압방법과 증발방법의 결과와 비교하였다. 비교 결과, 서로 다른 시험법으로 획득한 함수특성 곡선과 차이가 거의 존재하지 않았으며, 측정시간이 크게 단축되는 결과를 보였다. 따라서, 연속 가압방법을 통하여 다양한 조건에서의 함수특성 곡선을 빠르고 정확하게 획득할 수 있을 것으로 판단된다.

The soil-water characteristic curve (SWCC) plays an important role in determining the soil suction parameters required to predict the seepage or shear behaviors of unsaturated soils. In addition, path dependency of the SWCC affects the mechanical and hydrologic behaviors. In general, there is a disadvantage that it takes a long time to measure both the drying and wetting paths of the SWCC by a stepwise pressurization method. Thus, the continuous pressurization method as an improved testing method for the SWCC was suggested, and the testing time for two paths of the SWCC was significantly shorter than the conventional methods. For the applicability evaluation of this method, the results of the SWCC obtained by the stepwise pressurization method and the evaporation method in this study were compared to the result obtained from this method. As a result, it was found that the difference among three methods was negligible, and the testing time of the continuous pressurization method was greatly decreased. Therefore, it can be said that it is possible to quickly and accurately measure the SWCC under various conditions by the continuous pressurization method.

키워드

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