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Effect of Cycles of Freezing and Thawing on the Behavior of Retaining Walls using Reduced-Scale Model Tests

축소 모형실험을 이용한 동결-융해 반복작용이 옹벽 구조물의 거동에 미치는 영향

Chungsik Yoo1*
,
Dong-Wook Jang2
유 충식1*
,
장 동욱2
1Professor, Dept. of Civil and Envir. Engrg., Sungkyunkwan Univ.
2Former Graduate Student, Dept. of Civil and Envir. Engrg., Sungkyunkwan Univ.
*교신저자. *Corresponding Author. 
30 September 2014. pp. 49-58
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Abstract

This paper presents the results of a reduced-scale physical model investigation into the behavior of retaining walls subject to cycles of freezing and thawing due to seasonal temperature change. Reduced-scale model walls equipped with a temperature control chamber that can simulate freezing and thawing conditions were first constructed and a series of tests were conducted with due consideration of different initial water contents of backfill soil and soil types. The results indicate that cycles of freezing and thawing process increase wall deformation as well as earth pressure acting on the wall. Also revealed was that the effect of the freezing and thawing cycles becomes more pronounced for cases with a larger initial water content and for soils with a larger fine content. Practical implications of the findings from this study are discussed in great detail.

Keywords
Reduced scale model test
Retaining wall
Braced excavation
Freezing and thawing

본 논문에서는 계절적 환경변화로 인한 동결-융해 반복과정에 노출되는 옹벽구조물의 거동에 관한 축소 모형실험 연구 내용을 다루었다. 이를 위해 먼저 동결-융해 과정을 모사할 수 있는 모형 옹벽 실험 장치를 구현하고 실제 계절별 온도 변화 과정을 모사하였으며 다양한 흙의 함수비 및 뒤채움흙의 종류 등을 따른 영향 변화를 고찰을 위한 모형실험을 수행하였다. 실험 결과 계절별 온도변화에 따른 동결-융해 반복 과정은 옹벽의 변위를 증가시키고 토압을 증가시키는 것으로 검토되었다. 아울러 동결-융해 반복 사이클의 영향은 흙의 초기 함수비가 클수록 그리고 세립분을 많이 포함할수록 증가되는 것으로 검토되었다. 본 논문에서는 도출된 연구결과가 실무적 차원에서 지니는 의미에 대한 내용을 기술하였다.

References
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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 : 13
  • No :3
  • Pages :49-58
  • Received Date : 2014-04-30
  • Revised Date : 2014-09-22
  • Accepted Date : 2014-09-24
  • DOI :https://doi.org/10.12814/jkgss.2014.13.3.049
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