파랑-구조물-지반 상호작용에 의한 혼성제 주변 해저지반의 3차원 동적응답 특성

다국어 초록 (Multilingual Abstract)

If the seabed is exposed to high waves for a long period, the pore water pressure may be excessive, making the seabed subject to liquefaction. As the water pressure change due to wave action is transmitted to the pore water pressure of the seabed, a phase difference will occur because of the fluid resistance from water permeability. Thus, the effective stress of the seabed will be decreased. If a composite breakwater or other structure with large wave reflection is installed over the seabed, a partial standing wave field is formed, and thus larger wave loading is directly transmitted to the seabed, which considerably influences its stability. To analyze the 3-D dynamic response characteristics of the seabed around a composite breakwater, this study performed a numerical simulation by applying LES-WASS-3D to directly analyze the wave-structure-soil interaction. First, the waveform around the composite breakwater and the pore water pressure in the seabed and rubble mound were compared and verified using the results of existing experiments. In addition, the characteristics of the wave field were analyzed around the composite breakwater, where there was an opening under different incident wave conditions. To analyze the effect of the changed wave field on the 3-D dynamic response of the seabed, the correlation between the wave height distribution and pore water pressure distribution of the seabed was investigated. Finally, the numerical results for the perpendicular phase difference of the pore water pressure were aggregated to understand the characteristics of the 3-D dynamic response of the seabed around the composite breakwater in relation to the water-structure-soil interaction.

참고문헌 (Reference)

1 양순보, "해저지반에서 계측된 잔류과잉간극수압에 대한 비교 연구" 한국항해항만학회 37 (37): 173-179, 2013

2 허동수, "파랑하중에 의한 잠제 주변 해저지반의 3차원 동적응답 특성" 한국해양공학회 28 (28): 331-337, 2014

3 허동수, "잠제 설치 연안의 처오름 높이 특성 : PART Ⅰ - 잠제의 평면배치에 의한 영향" 대한토목학회 28 (28): 345-354, 2008

4 허동수, "사각격자체계 수치모델에서의 경사면 처리기법에 관하여" 대한토목학회 28 (28): 591-594, 2008

5 Ulker, M.B.C, "Wave-induced Dynamic Response and Instability of Seabed around a Breakwater" 37 : 1522-1545, 2010

6 Hur, D. S, "Three-dimensional Flow Characteristics around Permeable Submerged Breakwaters with Open Inlet" 44 : 100-116, 2012

7 Hur, D. S, "The Phase Difference Effects on 3-D Structure of Wave Pressure Acting on a Composite Breakwater" 35 : 1826-1841, 2008

8 Sumer, B.M, "The Mechanics of Scour in the Marine Environment" 17 : 552-, 2002

9 Hur, D. S, "Simulation of the Nonlinear Dynamic Interactions between Waves, a Submerged Breakwater and the Seabed" 35 : 511-522, 2008

10 Ye, J, "Seismic Dynamics of Offshore Breakwater Onliquefiable Seabed Foundation" 76 : 86-99, 2015

11 Jeng, D. S, "Response of Porous Seabed around Breakwater Heads" 35 : 864-886, 2008

12 Kirca, V, "Residual Liquefaction of Seabed under Standing Waves" ASCE 139 : 489-501, 2013

13 Hur, D. S, "Numerical Study on the Interaction among a Nonlinear Wave, Composite Breakwater and Sandy Seabed" 57 : 917-930, 2010

14 Sakakiyama, T, "Numerical Simulation of Nonlinear Wave Interacting with Permeable Breakwater" ASCE 1517-1530, 1992

15 Mostafa, A.M, "Nonlinear Wave, Composite Breakwater and Seabed Dynamic Interaction" 125 : 88-97, 1999

16 Liu, S, "Non-iinear Flows in Porous Media" 86 : 229-252, 1999

17 Smagorinsky, J, "General Circulation Experiments with the Primitive Equation" 91 (91): 99-164, 1963

18 Ergun, S, "Fluid Flow through Packed Columns" 48 (48): 89-94, 1952

19 Ulker, M.B.C, "Dynamic Respones of Seabed-Rubble Mound Breakwater System under Seismic Waves" 25-29, 2014