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2025 Vol.41, Issue 4 Preview Page
Rainfall-induced Slope Stability of Panel-type Retaining Walls Based on Construction Methods

강우시 시공방식에 따른 판넬식 옹벽 비탈면 안정성 분석

Jae-Hong Kim1
,
Dae-Yong Hwang2
,
Jaw-Il Shin3
,
Tae-Wan Kim4*
김 재홍1
,
황 대용2
,
신 좌일3
,
김 태완4*
1Member, Associate Prof., Dept. of Civil and Environmental Engineering, Dongshin Univ.
2Managing Director, Yooshin Engineering Co
3Member, Graduate Student, Dept. of Civil and Environmental Engineering, Dongshin Univ.
4Member, Graduate Student, Dept. of Civil and Environmental Engineering, Dongshin Univ.
1정회원, 동신대학교 토목환경공학과 부교수
2비회원, (주)유신 건설사업관리부 상무
3정회원, 동신대학교 토목환경공학과 박사과정
4정회원, 동신대학교 토목환경공학과 박사과정
*Corresponding Author
31 August 2025. pp. 145-154
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Abstract

Panel-type retaining walls are classified into top-down and bottom-up construction methods, which should be applied appropriately depending on the geometric conditions. This study analyzed variations in the safety factor of a panel-type retaining wall at the OO site in Yeonggwang-gun, Jeollanam-do, under actual rainfall conditions, according to the construction method (top-down or bottom-up). The numerical analysis considered variables including construction method, rainfall duration, field scale, and soil strength. Under the geometric conditions of this study, the top-down method satisfied the standard safety factor (Fs = 1.3) during the rainy season at every construction stage, whereas the bottom-up method failed to meet the standard safety factor starting from the first stage of construction. The retaining wall, constructed with 2-week intervals between stages, experienced a rapid decrease in the safety factor due to rainfall, showing its vulnerability in the early construction phases. The results of this analysis confirmed that the top-down method demonstrated initial construction stability; however, the bottom-up method highlighted the risk of retaining wall collapse due to rainfall. To develop more specific design methods in the future, it will be necessary to investigate the interrelationship between changes in soil strength parameters and safety factors at each construction stage, considering variations in the slope inclination of the retaining wall.

Keywords
Bottom-up
Numerical analysis
Panel-type retaining wall
Rainfall infiltration
Top-down

판넬식 옹벽은 시공방식에 따라 하향식(Top-down)과 상향식(Bottom-up) 공법으로 구분되며 지형 조건에 따라 적합한 방식을 선택한다. 본 연구는 전라남도 영광군 소재의 OO현장에 설치된 판넬식 옹벽을 대상으로 시공방식(Top-down, Bottom-up)에 따라 현장 강우를 적용하여 안전율의 변화를 해석하였다. 수치해석 조건은 시공방식, 강우조건, 현장 규모, 지반 강도 등의 변수를 고려하였다. 본 연구의 현장 지형 조건에서 Top-down 방식은 시공 단계별 조건에서 우기시 기준 안전율(Fs=1.3)을 만족하였으나, Bottom-up 방식은 1단 시공 단계부터 기준 안전율을 만족하지 못하였다. 단계별 2주 시공 기간이 적용된 옹벽은 강우로 인한 급격한 안전율 저하가 발생하여 초기 시공 구간의 취약성이 나타났다. 이러한 결과는 초기 안정성 확보가 가능한 Top-down 방식이 Bottom-up 방식보다 비탈면 옹벽 시공에 유리한 방식임을 확인하였다. 향후 설계 방법들을 구체적으로 제안하기 위해서 지반 강도정수에 대한 차이와 옹벽의 비탈면 기울기 변화에 대한 시공 단계별 안전율의 상호 관계 검토가 필요할 것으로 판단된다.

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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 : 41
  • No :4
  • Pages :145-154
  • Received Date : 2025-07-21
  • Revised Date : 2025-08-17
  • Accepted Date : 2025-08-17
  • DOI :https://doi.org/10.7843/kgs.2025.41.4.145
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