Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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A Simplified Method for Evaluating Damage of Caisson-Type Quay Wall During Earthquakes

지진시 케이슨식 안벽의 피해 예측을 위한 간편법 개발

  • Hyeonsu Yun (Department of Civil Engineering, Gyeongsang National University) ;
  • Minje Back (Department of Civil Engineering, Gyeongsang National University) ;
  • Jiahao Sun (Graduate Student, Department of Civil Engineering, Gyeongsang National University) ;
  • Seong-Kyu Yun (Engineering Research Institute, Gyeongsang National University) ;
  • Gichun Kang (Department of Civil Engineering, Gyeongsang National University)
  • 윤현수 ;
  • 백민제 ;
  • 손가호 ;
  • 윤성규 ;
  • 강기천
  • Received : 2024.04.23
  • Accepted : 2024.07.08
  • Published : 2024.09.30
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Abstract

To better prepare for the increasing frequency of earthquakes, securing the seismic performance of coastal structures is more urgent than ever. Evaluating the stability of coastal structures precedes ensuring seismic performance. Methods for assessing stability during earthquakes include finite element analysis and model testing. However, these methods have the disadvantage of requiring significant cost and time. Therefore, this study aimed to propose a simplified method for quickly and easily predicting the horizontal displacement of caisson-type qual wall structures during earthquakes. Initially, existing simplified methods were compared and analyzed against numerical analysis. The results revealed limitations in predicting the displacement of caisson-type qual wall using existing simplified methods. To address this, correction coefficients related to the backfilled ground N value, velocity's PSI, and the W/H ratio were added to the existing simplified method. After the adjustments, a noticeable reduction in errors was observed, demonstrating high precision within the 200 gal range.

최근 잦아지고 있는 지진에 대비하기 위해 해안구조물의 내진성능 확보가 어느 때보다 절실한 상황이다. 내진성능 확보를 위해서는 해안구조물의 안정성 평가가 선행되어야 한다. 지진에 대한 안정성을 평가하는 방법으로는 유한요소해석법이나 모형시험 등을 예시로 들 수 있다. 하지만 위 방법들은 막대한 비용과 시간이 필요로 한다는 단점이 있다. 따라서 본 연구는 지진시 케이슨식 안벽구조물의 변위를 빠르고 쉽게 예측이 가능한 간편식 제안을 목표로 진행되었다. 먼저 기존의 간편법과 수치해석을 비교 분석하였다. 그 결과, 기존의 간편법으로 케이슨식 안벽의 수평변위를 예측하기엔 한계가 있다는 것을 확인하였다. 따라서 이를 보완하기 위해 기존의 간편법에 뒷채움 지반 N치 및 속도의 PSI(Power Spectral Intensity)와 W/H비(케이슨폭/케이슨높이)에 관한 보정계수들을 추가하였다. 보정 후 오차가 눈에 띄게 감소하였고 200gal 범위 안에서 높은 정밀도를 보이는 것을 확인하였다.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(NRF2020R1I1A3067248). This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(No. 2022R1I1A1A01073509).

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