Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Assessment of the Correlation between Segregation Potential and Hydraulic Conductivity with Fines Fraction

세립분 함유량에 따른 동상민감성 지수와 수리전도도의 상관관계 평가

  • Jin, Hyunwoo (Dept. of Future & Smart Construction Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Kim, Incheol (Dept. of Civil and Environmental Engrg., College of Engrg., Univ. of Nebraska-Lincoln) ;
  • Eun, Jongwan (Dept. of Civil and Environmental Engrg., College of Engrg., Univ. of Nebraska-Lincoln) ;
  • Ryu, Byung Hyun (Dept. of Future & Smart Construction Research, Korea Institute of Civil Engrg. and Building Technology) ;
  • Lee, Jangguen (Dept. of Future & Smart Construction Research, Korea Institute of Civil Engrg. and Building Technology)
  • 진현우 (한국건설기술연구원 미래스마트건설연구본부) ;
  • 김인철 (네브라스카대학교) ;
  • 은종완 (네브라스카대학교) ;
  • 유병현 (한국건설기술연구원 미래스마트건설연구본부) ;
  • 이장근 (한국건설기술연구원 미래스마트건설연구본부)
  • Received : 2021.11.18
  • Accepted : 2021.11.23
  • Published : 2021.12.31
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Abstract

The cryosuction (negative pore pressure) in freezing soils causes groundwater migration from the frozen fringe to freezing front for ice lens formation. Frost heave and heaving pressure by ice lens cause damage to ground infrastructure. In order to prevent damage by the frost heave, various frost susceptibility criteria have been proposed. The SP (Segregation Potential) is the most widely used classification criterion for frost susceptibility in cold regions. The expansion of the ice lens by the migration of the groundwater is a key role in frost heave mechanism, and thus it is necessary to evaluate the hydraulic conductivity. In this paper, soil mixtures of coarse-fines (sand-silt) were prepared in various weight fractions and used for frost heave and column permeability test. For each case, the SP and the hydraulic conductivity were derived and correlations were analyzed. As a results, the transition threshold of the SP and the hydraulic conductivity were shown at 20% and 50% of the silt weight fraction, respectively. Although there are difference between these transition thresholds, these two coefficients show a specific correlation. In the future, additional study should be conducted for detailed analysis of the threshold transition values between SP and hydraulic conductivity.

영하의 온도에 의해 지반이 동결되며 발생하는 음의 간극수압은 frozen fringe로부터 간극수 이동을 유발해 ice lens를 형성시키며, ice lens 형성으로 인한 흙의 동상 및 동상팽창압은 지반구조물의 피해를 발생시킨다. 동상에 의한 피해를 방지하기 위해 다양한 동상민감성 판정이 수행되고 있으며, 그 중 가장 활발하게 활용되는 방법은 SP(Segregation Potential)를 이용한 동상민감성 판정이다. 또한, 간극수 이동에 의한 ice lens의 확장은 동상 메커니즘의 핵심 원인으로 작용하기 때문에 수리전도도에 관한 평가가 필요한 실정이다. 본 연구에서는 모래와 실트를 다양한 중량비로 혼합해 동상실험 및 투수실험에 활용하였으며, 각 경우에 대해 SP 및 수리전도도를 도출하여 비교분석하였다. 그 결과 SP 및 수리전도도가 급격하게 변화하는 임계 전이값이 각각 실트 함유량이 20% 및 50% 인 경우에 나타났다. 이러한 임계 전이값의 차이에도 불구하고 SP는 수리전도도가 감소함에 따라 일정 값에 수렴하는 상관관계를 나타내고 있으며, 향후 임계 전이값 사이에 관한 추가적인 연구가 필요할 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원의 주요사업인 "동결지반의 동상 해석 및 장기강도 평가 기술 개발(20210489-001)" 과제의 지원으로 수행되었으며, 이에 깊은 감사를 드립니다.

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