Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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A Study on the Dynamic Behaviour of Composite Breakwaters Based on Dynamic Analysis Considering Effective Stresses

유효응력을 고려한 동해석을 통한 직립식 방파제의 동적 거동에 대한 연구

  • Youngjin Jeon (College Institute of Industrial Technology, Kangwon National University)
  • Received : 2024.10.11
  • Accepted : 2024.10.21
  • Published : 2024.11.01
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Abstract

In the current work, finite difference analysis was conducted by investigating the influence of dynamic analysis, considering effective stress, on the dynamic response of composite breakwaters. For comparison, the seismic behavior of breakwaters during the Kobe earthquake was analyzed, and performance-based seismic design was validated through centrifuge model test data, accompanied by a parametric study. The composite breakwaters damaged by the Kobe earthquake were verified through numerical analysis based on effective stress analysis, and validation of both centrifuge model tests and numerical analysis methods was conducted. The results of numerical analysis confirmed the seismic resistance based on the performance-based. And the results of analysis identified similar vertical displacement and liquefaction have confirmed through excess pore pressures. Also this study was conducted on the based on performance-based seismic deign, focusing on the results of acceleration, displacement, pore pressure, and liquefaction. Therefore the purpose of this study is to verify the results of pore pressure and liquefaction through the application and non-application of Finn model to compare the determination of liquefaction by the effective stress analysis.

본 연구에서는 유효응력을 고려한 동해석이 직립식 방파제의 동적 거동에 미치는 영향에 대하여 유한차분해석을 실시함으로써 검증하였다. 비교를 위해 Kobe 지진으로 인한 방파제 거동과 원심모형실험 데이터를 통한 성능기반 내진설계 검증 및 parametric study를 수행하였다. Kobe 지진으로 피해를 본 직립식 방파제에 대하여 유효응력 해석을 근거하여 수치해석으로 검증하였고 원심모형시험 및 수치해석 기법에 대한 검증을 수행하였다. 수치해석 분석을 통해 성능기반 내진설계를 기반으로 한 지진 저항성을 확인하였으며, 수직변위 및 과잉간극수압을 통한 액상화 현상 등 유사한 결과를 도출하였다. 또한 지진 시 직립식 방파제의 거동 결과를 성능기반 내진설계를 바탕으로 가속도, 변위, 간극수압, 및 액상화의 유무 결과를 상세히 분석하였다. 따라서 본 연구의 목적인 유효응력 해석을 통해 액상화의 유무를 확인하고자 Finn model의 적용 또는 비적용을 통해 간극수압의 크기와 액상화 판단을 확인하였다.

Keywords

Acknowledgement

본 연구는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(RS-2023-00278033). 또한 2024년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. 2022R1A6A3A01085973).

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