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Research Article

Evaluation of Dynamic Stability of Slopes Using 1g Shaking Table Tests and Finite Element Analysis

1g 진동대 실험과 유한요소해석을 통한 사면의 동적 안전성 평가

Minseo Moon1
,
Geonju Park1
,
Sugeun Jeong2
,
Daehyeon Kim3*
문 민서1
,
박 건주1
,
정 수근2
,
김 대현3*
1Non-Member, Graduate Student, School of Civil Engineering, Chosun Univ., 10 Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea
2Non-Member, Ph.D Student, School of Civil Engineering, Chosun Univ., 10 Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea
3Member, Professor, School of Civil Engineering, Chosun Univ., 10 Chosundae 1-gil, Dong-gu, Gwangju 61452, Republic of Korea
*Corresponding Author
30 September 2025. pp. 13-25
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Abstract

Approximately 70% of South Korea’s land area consists of mountainous regions, and public awareness of seismic hazards has significantly increased following the 2016 Gyeongju and 2017 Pohang earthquakes. This study aims to quantitatively evaluate the dynamic stability of slopes under seismic loading by conducting 1g shaking table tests in parallel with finite element analysis. Laboratory model experiments were performed under various slope inclinations, and ABAQUS-based numerical models were developed under identical conditions. Time-history analysis was conducted to track the temporal variations in shear stress and shear strength, and the dynamic factor of safety (FS) was calculated along predefined slip surfaces. A comparison between experimental and numerical results verified the reliability of the numerical model. The proposed analysis method was found to effectively complement the limitations of pseudo-static analysis and contribute to more accurate seismic slope stability assessment.

Keywords
1g shaking table test
Numerical analysis
Slope stability
Safety factor

우리나라 국토의 약 70%는 산지로 구성되어 있으며, 최근 경주 및 포항 지역에서 발생한 지진을 계기로 지진에 대한 사회적 경각심이 크게 고조되었다. 이러한 배경 속에서, 지진 시 사면의 안정성 확보는 인명과 재산을 보호하기 위한 핵심 과제로 인식되고 있다. 본 연구는 지진하중에 따른 사면의 동적 안정성을 정량적으로 평가하기 위해, 1g 진동대 실험과 유한요소해석(Finite Element Analysis)을 병행하여 수행하였다. 다양한 경사 조건(1:2.0, 1:1.8, 1:1.3)을 고려하여 실내 모형실험을 수행하였고, 동일한 지반조건 및 경계조건을 반영하여 ABAQUS 기반의 수치해석 모델을 구축하였다. 이후 시간-이력 응답해석을 통해 사전에 정의된 가상 파괴면 상에서의 응력 성분을 추출하고, Mohr-Coulomb 기준에 따라 시간별 전단응력 및 전단강도를 산정하여 동적 안전율을 계산하였다. 해석 결과, 지진 입력의 주요 에너지가 작용하는 시점에서 FS가 급격히 저하되는 현상이 나타났으며, 이는 사면의 동적 취약 구간을 식별하는 데 효과적인 지표로 작용함을 확인하였다. 본 해석기법은 유사정적해석의 한계를 보완하고 정밀한 내진 안정성 평가에 기여 가능성을 확인하였다.

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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 : 24
  • No :3
  • Pages :13-25
  • Received Date : 2025-07-14
  • Revised Date : 2025-09-01
  • Accepted Date : 2025-09-16
  • DOI :https://doi.org/10.12814/jkgss.2025.24.3.013
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