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The Frost Heaving Susceptibility Evaluation of Subgrade Soils Using Laboratory Freezing System

실내 동상시스템을 이용한 노상토의 동상민감성 평가

Eun Chul Shin1
,
Byung Hyun Ryu2
,
Jeong Jun Park3*
신 은철1
,
류 병현2
,
박 정준3*
1Professor, Dept. of Civil and Environmental Engineering, Incheon National University
2Ph.D. Student, Dept. of Civil and Environmental Engineering, Incheon National University
3Research Professor, Dept. of Civil and Environmental Engineering, Incheon National University
*교신저자. *Corresponding Author. 
30 June 2013. pp. 13-23
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Abstract

The Korean Peninsula is considered as a seasonal frozen area that is thawed in the spring and frozen in the winter. The influence of fines of the frost susceptibility of subgrade soils were established by laboratory freezing tests simulating closely the thermal conditions in the field. During the winter season, the climate is heavily influenced by the cold and dry continental high pressure. Because of siberian air mass, the temperature of January is -6∼-7℃ on average. This chilly weather generate the frost heaving by freezing the moisture of soil and damage potential of the geotechnical structure. In the freezing soil, the ice lenses increase the freeze portion of soil by absorbing the ground water with capillary action. However, the capillary characteristics differ from the sort of soil on the state of freezing condition. In this study, ten soil samples are prepared. The basic physical property tests were performed by following the Korean Industrial Standard and the soil specimens were classified by the Unified Soil Classification System (USCS). These classified soils are used to perform the laboratory opened systems freezing test in order to determine the frost heaving characteristics of soils such as unfrozen water content, heaving amount, and freezing depth.

Keywords
Frost susceptibility
Heave amount
Unfrozen water content
Freezing depth
Laboratory freezing test

겨울에는 시베리아기단에 의해 한랭 건조한 대륙성 고기압의 영향을 받는 계절동토지역인 우리나라는 춥고 건조하여 1월 평균기온이 -6∼-7℃의 영하의 온도로 낮아져 지반동결시 수분이동으로 동상현상이 발생하여 지반구조물의 불균형 동결팽창을 초래한다. 동상 발생시 토립자는 모관력에 의해 지하수를 흡수하여 아이스렌즈를 형성하며, 이 모관 흡수력은 토립자의 크기에 영향을 받는다. 본 연구에서는 흙의 종류에 따른 동상민감성의 차이를 알아보기 위하여 공학적 특성이 다른 10종류의 흙시료에 대하여 물리적 특성 파악과 통일분류법에 의한 흙 분류를 통해 실내동상실험을 실시하였다. 이에 각각 흙의 종류에 따른 동결깊이, 동상팽창량, 부동수분, 아이스렌즈와 같은 동상특성을 확인하여 시료의 동상민감성을 평가하였다.

References
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 1. ASTM D5918-06 (2006), Standard Test Methods for Frost Heave and Thaw Weakening Susceptibility of Soils, American Society for Testing Materials, pp.401-412.
2
 2. Choi, C. (2011), “Development and verification of high effi-ciency experimental apparatus to evaluate freezing phenomenon of soils”, J. of the Korean Geosynthetics Society, Vol.10, No. 4, pp.93-103.
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13
13. Shin, E. C., Ryu, B. H., and Park, J. J. (2010), “The frost heaving characteristics of subgrade soils using laboratory freezing system”, J. of Korean Society of Road Engineers, Vol.12, No.2, pp. 71-79.
14
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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 : 12
  • No :2
  • Pages :13-23
  • Received Date : 2013-03-15
  • Revised Date : 2013-04-08
  • Accepted Date : 2013-04-09
  • DOI :https://doi.org/10.12814/jkgss.2013.12.2.013
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