규칙파동장하 잠제 주변지반의 동적거동에 관한 수치해석
Regular Waves-induced Seabed Dynamic Responses around Submerged Breakwater
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초록
잠제와 같은 중력식구조물 하부 해저지반에 고파랑이 장시간 작용하는 경우 토립자 내 간극의 체적변화를일으키는 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 가능성이높아진다. 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.
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.
참고문헌 (20)
- Biot, M.A, "General theory of three-dimensional consolidation", J. of Applied Physics, 12, pp.155~165 (1941)
- CDIT, "Research and development of numerical wave channel( CADMAS-SURF)", CDIT library, 12, ~ (2001)
- Hirt, C.W, "Volume of fluid(VOF) method for the dynamics of free boundaries", J. of Computational Physics, 39, pp.201~225 (1981)
- Hsu, T.J, "A numerical model for wave motions and turbulence flows in front of a composite breakwater", Coastal Engineering, 46(1), pp.25~50 (2002)
- Iai, S, "Strain space plasticity model for cyclic mobility, Soils and Foundations", Japanese Society of Soil Mechanics and Foundation Eng, 32(2), pp.1~15 (1992)
- Iai, S, "Analysis of undrained cyclic behavior of sand under anisotropic consolidation, Soils and Foundation", Japanese Society of Soil Mechanics and Foundation Eng, 32(2), pp.16~20 (1992)
- A new approximation for pore pressure accumulation in marine sediment due to water waves, "Jeng, D.S", Univ. of Sydney, 28~, pp.Research Report No. R868 (2006)
- Jeng. D.S, "An integrated model for the wave-induced seabed response around marine structures : Model verifications and applications", Coastal Engineering, 72, pp.1~19 (2013)
- José, M. C, "Failures of harbour walls at Malaga and Barcelona", Bulletin of Engineering Geology and the Environment, 70(1), pp.1~6 (2011)
- Kim, C.H, "Nonlinear dynamic responses of soil in seabed and wave field around coastal·ocean structures under the wave action", Doctor, pp.2007
- 이광호, "해수교환을 고려한 진동수주형 파력발전구조물에서 불규칙공기흐름에 관한 수치해석", 한국해안·해양공학회논문집, 25(3), pp.128~137 (2013), 한국해안,해양공학회[DOI]
- Mei, C.C, "Wave-induced responses in a fluid filled poro-elastic solid with a free surface - a boundary layer theory", Geophysical J. of the Royal Astronomical Society, 66(3), pp.597~631 (1981)
- Mizutani, N, "Nonlinear regular wave, submerged breakwater and seabed dynamic interaction", Coastal Engineering, 33, pp.177~202 (1998)
- Simplified set-up method of various parameters necessary to predict liquefaction damage of structures by FLIP program, "Morita, T", Technical Note of the Port and Harbour Research Institute Ministry of Transport, 1~36, pp.PARI, 869 (1997)
- Mostafa, A. M, "Nonlinear wave, composite breakwater, and seabed dynamic interaction", J. of Waterway, Port, Coastal, and Ocean Engineering, 125(2), pp.88~97 (1999), ASCE
- Sakakiyama, T, "Numerical simulation of nonlinear wave interaction with permeable breakwater", Proceedings of the 22nd ICCE, pp.1517~1530 (1992), ASCE
- Sumer, B.M, "Stability of submerged rock berms exposed to motion of liquefied soil in waves", Ocean Engineering, 38(7), pp.849~859 (2011)
- Sawada, S, "Analysis of liquefaction induced residual deformation for two types of quay wall: analysis by "FLIP"", Proceedings of the 12th World Conference on Earthquake Eng, pp.2486~ (2000)
- Sekiguchi, H, "Response of poroelastoplastic beds to standing waves", Soil and Foundations, 35(3), pp.31~42 (1995)
- Tobita, T, "Annuals of Disaster Preventive Research Institute" (2006), Kyoto University