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Research Article

Experimental Study to Evaluate Thermal and Mechanical Behaviors of Frozen Soils according to Organic Contents

유기물 함유량에 따른 동토 시료의 열적·역학적 거동 평가를 위한 실험적 연구

Sangyeong Park1
,
Hyeontae Park2
,
Hangseok Choi3
,
YoungSeok Kim4
,
Sewon Kim5*
박 상영1
,
박 현태2
,
최 항석3
,
김 영석4
,
김 세원5*
1Non-Member, Postdoctoral Researcher, School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
2Non-Member, Ph.D. Student, School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
3Member, Professor, School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
4Member, Senior Researcher Fellow, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Gyeonggi-Do 10223, Republic of Korea
5Member, Researcher, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Gyeonggi-Do 10223, Republic of Korea
*Corresponding Author
30 June 2024. pp. 53-62
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Abstract

Recently, development of non-traditional energy such as oil sands has been actively conducted in the cold region such as Canada. Frozen soil has different thermal and mechanical characteristics from general soil due to its high organic contents. This study evaluated the impact of organic matter content on the thermal and mechanical behavior of frozen soil samples collected from Alberta, Canada, and Gangwon Province, South Korea. As the organic content increases, the maximum dry unit weight decreases and the optimum moisture content increases in compaction tests. In uniaxial compression tests under frozen conditions, the strength of the frozen specimens increased as the temperature decreased. The strength of Canada soil sample increased with higher organic matter content at low temperatures. However, the strength of frozen soil was not significantly affected by organic matter content due to the complex behavior and unfrozen water content. Thermal conductivity tests showed higher thermal conductivity in frozen conditions compared to unfrozen conditions, due to the higher thermal conductivity of ice compared to water. These findings provide essential data for geotechnical design and construction in large-scale projects such as oil sands development in cold regions. Further research is needed to explore the impact of organic matter content on different types of frozen soils.

Keywords
Frozen soil
Laboratory experiment
Loss on ignition method
Organic soil

최근 오일샌드와 같은 비전통에너지 개발이 활발히 이루어지고 있는 동토 지역은 지반의 유기물 함유량이 높아 일반적인 지반과 다른 열적⋅역학적 특성을 지니고 있다. 본 논문에서는 캐나다 앨버타주와 국내 강원도에서 채취한 동토 시료를 대상으로 다양한 실내시험을 통해 유기물 함유량이 토양의 열적 및 역학적 거동에 미치는 영향을 평가하였다. 유기물 함유량이 증가할수록 다짐시험에서 최대 건조단위중량은 감소하고 최적 함수비는 증가하는 경향이 나타났다. 동결 일축 압축시험에서는 동결온도가 낮아질수록 시료의 강도가 증가했으나, 모든 시료는 동결 조건에서 얼음 및 부동수분의 양에 따라 복잡한 거동을 보여 유기물 함유량이 강도에 큰 영향을 미치지 않았다. 열전도도 측정시험에서는 동결 조건에서 비동결 조건보다 열전도도가 더 크게 측정되었고, 이는 물보다 얼음의 열전도도가 더 크기 때문으로 판단된다. 또한, 유기물 함유량이 증가할수록 부동 수분량도 증가하는 경향이 나타났다. 이러한 결과는 극한지 건설 프로젝트에서 지반 공학적 설계 및 시공에 중요한 엔지니어링 기초 자료로 활용할 수 있을 것이다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 23
  • No :2
  • Pages :53-62
  • Received Date : 2024-05-30
  • Revised Date : 2024-06-12
  • Accepted Date : 2024-06-14
  • DOI :https://doi.org/10.12814/jkgss.2024.23.2.053
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