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2013 Vol.29, Issue 11 Preview Page
A Case Study on the Restoration of Collapsed Geosynthetics Reinforced Soil Wall Using Limit Equilibrium and Numerical Analyses

한계평형해석과 수치해석에 의한 붕괴된 보강토 옹벽 복구 사례에 관한 연구

Myoung-Soo Won1*
,
Hyeong-Joo Kim2
,
Young-Shin Kim3
,
Jeong-Ho Choi4
원 명수1*
,
김 형주2
,
김 영신3
,
최 정호4
1Assistant Prof., Dept. of Civil Engrg., Kunsan National Univ.
2Prof., Dept. of Civil Engrg., Kunsan National Univ.
3Ph.D Candidate/P.E., Dept. of Civil and Environmental Engrg., Kunsan National Univ.
4Ph.D Candidate, Dept. of Civil and Environmental Engrg., Kunsan National Univ.
1군산대학교 토목공학과 조교수
2군산대학교 토목공학과 교수
3군산대학교 토목환경공학부 박사과정
4군산대학교 토목환경공학부 박사과정
*교신저자. *Corresponding Author. 
30 November 2013. pp. 107-118
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Abstract

Geosynthetic reinforced soil (GRS) walls have been increasingly applied recently due to its numerous geotechnical engineering applications. However failure occurs in some cases of constructed GRS walls. These GRS wall failures are mostly due to the unpredictable characteristics of intensive rainfall. Hence, the need for new and innovative ideas for rehabilitation methods has been getting attention. This paper introduces a case study for the design and restoration method of collapsed GRS wall using Limit equilibrium and Numerical Analyses. Restoration method includes: (1) soil nailing without backfill excavation and (2) reconstruction with GRS wall after collapsed backfill excavation. Analyses results show minimal horizontal displacements and shear strain on the reinforced concrete facing for the restoration case with soil nailing. On the other hand, horizontal displacements are developed in the middle of the mortar block facing and shear strains are developed at the bottom facing with spiral curves for the reconstructed GRS wall after collapsed backfill excavation. Therefore, the collapsed GRS wall was restored with the soil nailing without backfill excavation and its construction procedures are discussed in this paper.

Keywords
Soil nailing
GRS wall, Reinforcement
Geogrid, Failures
Restoration

보강토 옹벽의 적용사례가 날로 증가하고, 일반화됨에 따라 그에 따른 피해도 종종 발생하고 있다. 최근 들어 게릴라성 집중강우 등으로 인해 보강토 옹벽이 붕괴되는 사례가 종종 발생되면서 붕괴된 옹벽의 복구방법에 대한 관심이 커지고 있다. 이와 같은 배경 하에 이 논문에서는 (1) 피해상태로 쏘일네일링을 사용하여 복구하는 안과 (2) 붕괴된 보강토 옹벽에 대해 보강토체 제거 후 재시공하는 안에 대해 한계평형해석과 수치해석을 수행하여 안정성과 거동을 분석하여 설계하고 시공한 사례를 소개하였다. 검토결과, 쏘일네일링 복구 옹벽의 경우 보강콘크리트 전면벽체에서 수평변위와 전단변형률 등은 거의 발생하지 않았으나, 재시공 옹벽은 수평변위의 경우 벽체 중앙부에서 발달하고 전단변형률은 옹벽의 저부를 중심으로 나선 형태로 발달하는 것으로 나타났다. 따라서, 피해옹벽은 쏘일네일링으로 복구하였으며, 일련의 시공과정을 소개하였다.

References
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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :11
  • Pages :107-118
  • Received Date : 2013-10-18
  • Revised Date : 2013-11-10
  • Accepted Date : 2013-11-14
  • DOI :https://doi.org/10.7843/kgs.2013.29.11.107
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