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2026 Vol.42, Issue 4 Preview Page
Sensitivity Analysis of Retaining Wall Displacement Based on Statistical Analysis of Layer-Specific Shear Strength

지층별 전단강도의 통계분석을 통한 흙막이 벽체의 변위 민감도 분석

Jun-Seok Lee1
,
Young-Min Kim2
,
Kang-Il Lee3*
이 준석1
,
김 영민2
,
이 강일3*
1Member, Ph.D. Student, Dept, of Civil Engineering and Environment Engineering, Daejin Univ.
2Member, Ph.D. Student, Dept, of Smart City and Construction Convergence Engineering, Daejin Univ.
3Member, Prof., Dept. of Smart Construction and Environmental Engineering, Daejin Univ.
1정회원, 대진대학교 토목환경공학과 박사과정
2정회원, 대진대학교 스마트시티건설융합공학과 박사과정
3정회원, 대진대학교 스마트건설환경공학과 교수
*Corresponding Author
31 August 2026. pp. 179-189
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Abstract

This study evaluated how statistical variability in layer-specific shear strength parameters affects retaining wall displacement using geotechnical investigation data from approximately 50 sites in Korea. Descriptive statistics for the internal friction angle and cohesion of fill, alluvial deposits, weathered soil, and weathered rock were calculated, and the suitability of normal, log-normal, exponential, and uniform distributions was compared using chi-square goodness-of-fit tests. Five input levels were established based on the mean and standard deviation of each parameter, and the maximum lateral wall displacements across 35 cases were analyzed using a single-layer elastoplastic beam model. Normal distributions provided the best fits to the internal friction angles of fill and weathered soil and the cohesion values of weathered soil and weathered rock, whereas log-normal distributions were generally more suitable for the remaining parameters. The calculated sensitivity ranges were 0.20–2.64 for the cohesion of the clayey alluvial layer and 0.43–2.55 and 0.52–2.08 for the internal friction angles of the sandy alluvial layer and fill, respectively. Both cohesion and internal friction angle strongly affected wall displacement in weathered soil, whereas their effects in weathered rock were limited to ~10%.

Keywords
Elastoplastic beam method
Flexible retaining wall
Sensitivity analysis
Shear strength parameter
Statistical variability

본 연구는 국내 약 50개 현장의 지반조사자료를 이용하여 지층별 전단강도정수의 통계적 분석을 통해서 흙막이 벽체의 변위에 미치는 영향을 평가하였다. 매립층, 퇴적층, 풍화토층 및 풍화암층의 내부마찰각과 점착력에 대해 기초통계량을 산정하고, 카이제곱 검정을 통해 정규분포, 로그정규분포, 지수분포 및 균등분포의 적합성을 비교하였다. 평균과 표준편차를 기준으로 전단강도정수를 다섯 단계로 설정하고, 단일지층 탄소성보법 모델을 이용하여 총 35개 조건의 최대 벽체 수평변위를 분석하였다. 매립층과 풍화토층의 내부마찰각 및 풍화토층과 풍화암층의 점착력은 정규분포가 적합하였으며, 나머지 분석대상은 로그정규분포가 상대적으로 적합하였다. 민감도는 점토질 퇴적층의 점착력에서 0.20~2.64, 모래질 퇴적층과 매립층의 내부마찰각에서 각각 0.43~2.55와 0.52~2.08로 나타났다. 풍화토층에서는 내부마찰각과 점착력이 모두 주요 변수로 평가된반면, 풍화암층에서는 두 매개변수의 영향이 약 10% 내외로 제한적이었다.

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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 : 42
  • No :4
  • Pages :179-189
  • Received Date : 2026-07-16
  • Revised Date : 2026-08-07
  • Accepted Date : 2026-08-09
  • DOI :https://doi.org/10.7843/kgs.2026.42.4.179
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