Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Stability of Quay Wall Considering Overtopping of Tsunami

지진해일파의 월파를 고려한 해안안벽의 안정성평가

  • Lee, Kwang-Ho (Industry and Academia Cooperation Foundation, Kwandong Univ.) ;
  • Kim, Do-Sam (Dept. of Civil Engineering, Korea Maritime Univ.) ;
  • Kim, Tae-Hyung (Dept. of Civil Engineering, Korea Maritime Univ.)
  • 이광호 (관동대학교 산학협력단) ;
  • 김도삼 (한국해양대학교 토목공학과) ;
  • 김태형 (한국해양대학교 토목공학과)
  • Received : 2012.03.13
  • Accepted : 2012.08.24
  • Published : 2012.09.28
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Abstract

This study was conducted to estimate the stability of a quay wall in case of wave overtopping under the combined action of an earthquake and tsunami using limit equilibrium method. The tsunami force was calculated by using a numerical program called TWOPM-3D (3-D one-field Model for immiscible TWO-Phase flows). Especially, the wave force acting behind the quay wall after a tsunami wave overtopping was estimated by treating back fill as a permeable material. The stability of the quay wall was assessed for both the sliding and overturning modes under passive and active conditions. The variation in the stability of the quay wall with time was determined by parametric studies, including those for the tsunami wave height, seismic acceleration coefficient, internal friction angle of the soil, wall friction angle, and pore water pressure ratio. When the earthquake and tsunami were considered simultaneously, the tsunami induced wave overtopping increased the stability of the quay wall under the passive condition, but in the active condition, the safety factors decreased.

본 연구에서는 월파시 해안안벽에 작용하는 지진과 지진해일의 영향에 대하여 한계평형상태해석법을 적용하여 안정성을 검토하였다. 지진해일파력에 대하여 TWOPM-3D를 적용하였으며, 특히 안벽의 뒷채움재를 투과성재료로 가정하여 지진해일파가 월파 후에 안벽배후에 작용하는 파력을 산정하였다. 그리고, 수동상태와 주동상태 조건에서 해안안벽의 안정성에 영향을 주는 요인인 지진해일파고, 뒷채움재의 수위, 수평 수직지진가속도계수, 내부마찰각, 벽마찰각, 간극수압비 등을 변화하여 활동과 전도에 대한 안벽 안전율의 변화특성을 시간에 따라 검토하였다. 이로부터 지진과 지진해일파의 작용하에 지진해일파가 안벽을 월파하는 경우 수동상태에 대한 안전율은 결과적으로 안전율을 증가시키는 요인으로 작용하는 반면, 주동상태에 대하여 결과적으로 안전율을 감소시키는 요인으로 작용함을 확인할 수 있었다.

Keywords

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  1. Quay Wall Stability Considering Earthquake and Tsunami Overtopping Forces Together in the Active Condition vol.15, pp.4, 2014, https://doi.org/10.1061/(ASCE)NH.1527-6996.0000151