Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Regular Waves-induced Seabed Dynamic Responses around Submerged Breakwater

규칙파동장하 잠제 주변지반의 동적거동에 관한 수치해석

  • Lee, Kwang-Ho (Dept. of Energy Resources and Plant Eng., Catholic Kwandong University) ;
  • Ryu, Heung-Won (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Kim, Dong-Wook (Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University) ;
  • Kim, Do-Sam (Dept. of Civil Eng., Korea Maritime and Ocean Univ.) ;
  • Kim, Tae-Hyung (Dept. of Civil Eng., Korea Maritime and Ocean Univ.)
  • 이광호 (가톨릭관동대학교 에너지자원플랜트공학과) ;
  • 류흥원 (한국해양대학교 대학원 토목환경공학과) ;
  • 김동욱 (한국해양대학교 대학원 토목환경공학과) ;
  • 김도삼 (한국해양대학교 건설공학과) ;
  • 김태형 (한국해양대학교 건설공학과)
  • Received : 2016.05.12
  • Accepted : 2016.06.13
  • Published : 2016.06.30
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Abstract

In case of the seabed around and under gravity structures such as submerged breakwater is exposed to a large wave action long period, the excess pore pressure will be generated significantly due to pore volume change associated with rearrangement soil grains. This effect will lead a seabed liquefaction around and under structures as a result from decrease in the effective stress. Under the seabed liquefaction occurred and developed, the possibility of structure failure will be increased eventually. In this study, to evaluate the liquefaction potential on the seabed quantitatively, numerical analysis was conducted using the expanded 2-dimensional numerical wave tank model and the finite element elasto-plastic model. Under the condition of the regular wave field, the time and spatial series of the deformation of submerged breakwater, the pore water pressure (oscillatory and residual components) and pore water pressure ratio in the seabed were estimated.

잠제와 같은 중력식구조물 하부 해저지반에 고파랑이 장시간 작용하는 경우 토립자 내 간극의 체적변화를 일으키는 과정에서 과잉간극수압이 크게 발생될 수 있고, 이에 따른 유효응력의 감소에 의하여 구조물 근방 및 하부의 해저지반에 액상화가 발생될 수 있다. 지반액상화가 발생 및 발달되면 종국적으로 구조물이 파괴될 가능성이 높아진다. 본 연구에서는 2차원수치파동수로를 불규칙파동장으로 확장한 수치해석법과 유한요소법에 기초한 탄 소성지반응답용 수치해석프로그램을 적용하여 규칙파동장 하에서 잠제의 변위, 그리고 해저지반 내에서 간극수압(진동성분과 잔류성분), 간극수압비 등과 같은 지반거동의 시 공간변화로부터 액상화 가능성을 정량적으로 평가한다.

Keywords

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  2. Experimental Investigation on In-Situ Capping Erosion by Waves vol.17, pp.10, 2016, https://doi.org/10.14481/jkges.2016.17.10.33
  3. Numerical Analysis on Liquefaction Countermeasure of Seabed under Submerged Breakwater using Concrete Mat Cover (for Regular Waves) vol.28, pp.6, 2016, https://doi.org/10.9765/KSCOE.2016.28.6.361