Slip Failure Analysis and Evaluation of Wave Pressure Effects on Rubble Mound Breakwater using the Strength Reduction Method

Hyeok-Ju Lee; Jong-In Lee; Jae-Min Kim

doi:10.7734/COSEIK.2026.39.1.15

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2026 Vol.39, Issue 1 Preview Page Next Page

Research Paper

Slip Failure Analysis and Evaluation of Wave Pressure Effects on Rubble Mound Breakwater using the Strength Reduction Method 강도감소법을 이용한 경사식 방파제의 슬립 파괴 해석 및 파압 영향 평가

28 February 2026. pp. 15-24

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Abstract

This study performed a slip failure analysis and evaluated the structural stability of a rubble mound breakwater under wave pressure using the strength reduction method (SRM). The reliability of the SRM was verified by reproducing the results of a conventional slope stability analysis using ABAQUS finite element analysis. Considering the wave pressure distribution acting on the crown wall, the slip failure behavior within the rubble mound was analyzed. The analysis results showed that, under the sectional configuration and material properties adopted in this study, a non-circular slip failure surface was formed at a wave height of 7m, and the factor of safety was estimated to be approximately 1.68. In addition, uncertainty analysis using the Latin hypercube sampling was conducted to derive the fragility curve of the rubble mound breakwater with respect to variations in wave height. The results demonstrated that the probability of failure increased rapidly with wave height, and the critical wave height was evaluated to be approximately 6.85m. This study demonstrates the effective applicability of numerical analysis based on SRM to the wave-resisting stability and fragility evaluation of rubble mound breakwaters.

Keywords

strength reduction method

rubble mound breakwater

slip failure

fragility evaluation

이 연구에서는 파랑 하중을 받는 경사식 방파제의 구조적 안정성을 평가하기 위하여 강도감소법(Strength Reduction Method)을 이용한 슬립 파괴 해석을 수행하였다. 강도감소법의 신뢰성은 기존의 사면 안정 해석 결과를 유한요소해석 프로그램인 ABAQUS로 재현함으로써 검증하였다. 또한, 상치 콘크리트에 작용하는 파압 분포를 고려하여 경사식 방파제 내부의 슬립 파괴 거동을 분석하였다. 해석 결과, 이 연구에서 사용한 단면 형상 및 물성 조건 하에서 파고 7m 조건에서 비원형 슬립 파괴면이 발생하였고, 안전율은 약 1.68로 산정되었다. 추가적으로 Latin Hypercube Sampling을 이용한 불확실성 해석을 수행하여 파고 변화에 따른 경사식 방파제의 취약도 곡선을 도출하였다. 분석 결과 파고가 증가함에 따라 파괴 확률이 급격히 증가하였으며, 임계 파고는 약 6.85m로 평가되었다. 이 연구는 강도감소법 기반 수치해석이 경사식 방파제의 내파 안정성 및 취약도 평가에 효과적으로 적용될 수 있음을 보여준다.

키워드

강도감소법

경사식 방파제

슬립 파괴

취약도 평가

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 39
No :1
Pages :15-24
Received Date : 2025-10-28
Revised Date : 2025-12-04
Accepted Date : 2025-12-08
DOI :https://doi.org/10.7734/COSEIK.2026.39.1.15

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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