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2015 Vol.14, Issue 3 Preview Page
Slope Stability Analysis according to Repeated Freezing and Thawing of the Soil

토질의 동결 융해 반복에 따른 사면의 안정성에 관한 연구

Eun Chul Shin1*
,
Hui Su Shin2
,
Cheol Gyu Jung3
신 은철1*
,
신 희수2
,
정 철규3
1Professor, Dept. of Civil and Environmental Enginnering, Incheon National University
2Ph.D. Student, Dept. of Civil and Environmental Enginnering, Incheon National University
3Ph.D. Student, Dept. of Civil and Environmental Enginnering, Incheon National University
*교신저자. *Corresponding Author. 
30 September 2015. pp. 43-51
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Abstract

In seasonal frozen areas which have a temperature difference in the winter and spring season like south korea, if stiffness reduction by repeated freezing and thawing occurs to slopes adjacent to private facilities or mountain slopes, safety factor is insufficient to design criteria and landslide could be occurs due to rainfall or snowfall. It can lead to large damage of human life and property. In this study, in order to examine the safety changes of mountain slopes by repeated freezing and thawing, soil samples series of SP and SM by USCS distributed in surface soil of mountain slopes were collected for specimens. Through the direct shear test, the characterestics of frozen soil shear strength were analyzed and by utilizing numerical methods, chracteristics of strength reduction of weathered granite soil according to repeated action of freezing and thawing, changes in the stability of the slopes when applying freezing and thawing of the soil samples were examined. As a result, the maximum shear stress decreased approximately 10%, and slope stability analysis confirmed that required safety factor is less than compare with the non-frozen samples.

Keywords
Frost heave
Frost reduction effect
Slope stability analysis
Freezing and Thawing

우리나라와 같이 4계절이 뚜렷한 지역은 동결․융해반복에 따른 강성도의 감소가 민간 시설물 인접 사면이나 산비탈면에 발생하였을 경우 안전율이 설계기준에 미흡하게 되는 현상이 발생되어 강우나 강설에 의한 산사태가 발생하여 큰 인명 및 재산 피해로 이어질 우려가 있다. 이 연구에서는 동결·융해 반복에 따른 산지 사면의 안정성 변화를 알아보기 위하여 산지 사면의 표토에 분포하는 통일 분류법상의 SP와 SM계열의 흙시료를 채취하여 공시체를 제작하고 직접전단실험을 통하여 동토전단강도에 대한 특성을 분석하고, 수치해석적 방법을 활용하여 동결융해의 반복작용에 따른 화강풍화토의 강도감소특성과 흙시료의 동결 융해 적용시의 사면의 안정성의 변화를 검토하였다. 그결과 최대 전단응력은 약 10%정도의 감소율을 보였고, 사면 안정성해석결과 비동결시료에 비하여 요구안전율 이하의 경우가 있음을 확인하였다.

References
1
1.Shin, E.C., Ryu, B.H., Kang, H.H. and Hwang, S.G. (2014), “Behavior Characteristics of Water Supply Pipeline Due to Freezing Temperature”, Korean Geosynthetics, Vol.13, No.4, pp.1-10.
2
2.Hoekstra, P. and Dywayne M., (1965), “Migration of Interlamellar Water During Freezing and Thawing of Wyoming Bentonite”, Soil Science Society of America Journal, Vol.29, No.5, pp.498-504.
3
3.Yong, R. and Warkentin, B. (1975), Soil Properties and Behaviour, Elsevier Scientific Publishing Company, Chapter 11. Soil freezing and permafrost, pp.383-419.
4
4.Shin, E.C., and Park, J.J. (2003), “An Experimental Study on Frost Heaving Pressure Characteristics”, Korean Geotechnical Society, Vol.19, No.2, pp.65-74.
5
5.Kim, Y.C., Bae, J.H. and Song, W.G. (2002), “An experimental Study on the Unfrozen Water Contents and Ultrasonic Wave Velocity in Frozen Soil”, Korean Soiciety of Civil Engineers, Vol.22, No.3-C, pp.207-217.
6
6.Han, Y.D. (2012) A Study on the Stability of Earthen Slope under Freezing-thawing Cycle, Master’s Thesis, Incheon National University, pp.23.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 14
  • No :3
  • Pages :43-51
  • Received Date : 2015-07-28
  • Revised Date : 2015-08-28
  • Accepted Date : 2015-08-31
  • DOI :https://doi.org/10.12814/jkgss.2015.14.3.043
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