• Title/Summary/Keyword: 실제작용파압

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Settlement Behavior of Rubble Mound Breakwater and Its Surrounding Seabed due to Wave-Loads (파랑하중에 의한 경사식방파제의 제체와 주변지반의 침하거동)

  • Yun, Seong-Kyu;Kim, Tae-Hyung;Lee, Kyu-Hwan;Lee, Kwang-Yeol
    • Journal of the Korean Geotechnical Society
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    • v.27 no.12
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    • pp.85-96
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    • 2011
  • A breakwater is a important structure for both calmness of harbor and protection of the port facilities from waves generated from typhoons or wind. This study adopted the rubble mound breakwater, which is one of the most popular type of breakwaters in Korea. Rubble mound breakwater had been designed by considering only static condition previously. Recently, a dynamic wave-load due to waves has been also considered in designing breakwater. In design, the wave-load is assumed as an uniform load which only acts in the front slope of the breakwater. However, the assumption is not applicable in reality. In this study, therefore, a real-time wave-load acting on the breakwater instead of the uniform load is considered, and it is assumed to be acting on the seabed too. Based on the numerical analysis, it is found that there is a significant difference in the maximum settlement compared with the result predicted by the existing design method.

혼성방파제의 무공과 유공케이슨의 수리 및 파압특성

  • 오영민;박우선;전인식;서경덕;이달수
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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    • 1992.08a
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    • pp.130-134
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    • 1992
  • 본 연구의 목표는 혼성방파제의 무공 및 유공 케이슨에 작용하는 파압분포에 대한 기존의 연구결과를 조사, 분석, 정리하고 실제로 이들에 대한 수리모형실험을 실시하여 관측된 결과를 기존의 연구결과(곡본승리 등 1982, 고교중웅 등 1983, Goda 1985, Takahashi 1991)와 비교, 분석함으로써 케이슨에 작용하는 파압은 물론 기타 수리현상의 특성을 파악하는 데 있다.(중략)

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The Phase Difference Effects on 3-D Structure of Wave Pressure Acting on a Composite Breakwater (혼성방파제에 작용하는 3차원 파압구조에 미치는 위상차의 영향)

  • Hur, Dong-Soo;Yeom, Gyeong-Seon;Bae, Ki-Seong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.5B
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    • pp.563-572
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    • 2006
  • In designing the coastal structures, the accurate estimation of wave forces on them is very important. Recently, the empirical formulae such as Goda formula are widely used to estimate wave forces, as well as 2-D hydraulic and numerical model tests. But, sometimes, these estimation methods mentioned above seem to be unreasonable to predict 3-D structure of wave pressure on the coastal structures with 3-D plane arrangement in the real coastal area. Especially, in case of consideration of phase difference at harbor and seaward sides of the large-sized coastal structures like a composite breakwater, it is easily expected that the real wave pressures on each section of coastal structure have 3-D distribution. A new numerical model of 3-D Large Eddy Simulation, which is applicable to permeable structure, is developed to clarify the 3-D structure of wave pressures acting on coastal structure. The calculated wave forces on 3-D structure installed on the submerged breakwater show in good agreement with the measured values. In this study, the composite breakwater is adopted as a representative structure among the large-sized coastal structures and the 3-D structure of wave pressures on it is discussed in relation to the phase difference at harbor and seaward sides of it due to wave diffraction and transmitted wave through rubble mound.

Stability Evaluation of Rear-Parapet Caisson Breakwaters under Regular Waves by Numerical Simulation (수치해석을 통한 규칙파를 받는 후부 패러핏 케이슨 방파제의 안정성 평가)

  • Lee, Byeong Wook;Park, Woo-Sun;Ahn, Sukjin
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.32 no.2
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    • pp.95-105
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    • 2020
  • In this study, using the CADMAS-SURF model, the characteristics of the wave pressures and the wave forces were analyzed according to the installation position of the parapet on top of the caisson, and the stability evaluation was carried out using estimated wave forces for the design wave condition. Numerical results show that adopting the rear-parapet reduces the front maximum wave pressures and wave forces, and the maximum wave pressure acting on the rear-parapet increases slightly compared to the front parapet, but the wave force acting on the rear-parapet has little effect on the stability of the breakwater due to the phase difference with the wave force acting on the front of the breakwater. In addition, impulsive wave pressures did not occur, as Yamamoto et al. (2013) pointed out the problem of the rear-parapet breakwater. As a result of the stability against sliding and overturning, it was estimated that the target safety factor of 1.2 could be secured by the self-weight of 13% less than the case of the front parapet. At this time, the maximum ground pressure was also reduced by 30%, and the applicability of the rear-parapet structure to the actual site was evaluated as high.

Numerical Analysis on Settlement Behavior of Seabed Sand-Coastal Structure Subjected to Wave Loads (파압에 의한 해안구조물-해저지반의 침하거동에 대한 수치해석)

  • Kang, Gi-Chun;Yun, Seong-Kyu;Kim, Tae-Hyung;Kim, Dosam
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.25 no.1
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    • pp.20-27
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    • 2013
  • Seabed settlement underneath a coastal structure may occur due to wave loading generated by storm surge. If the foundation seabed consists of sandy soil, the possibility of the seabed settlement may be more susceptible because of generation of residual excess pore-water pressure and cyclic mobility. However, most coastal structures, such as breakwater, quay wall, etc., are designed by considering wave load assumed to be static condition as an uniform load and the wave load only acts on the structure. In real conditions, however, the wave load is dynamically applied to seabed as well as the coastal structure. In this study, therefore, a real-time wave load is considered and which is assumed acting on both the structure and seabed. Based on a numerical analysis, it was found that there exists a significant effect of wave load on the structure and seabed. The deformation behavior of the seabed according to time was simulated, and other related factors such as the variation of effective stress and the change of effective stress path in the seabed were clearly observed.

Analysis of Abnormal Settlement Aspect of Caisson Breakwater by Incoming Wave Action in Affected Area of Typhoon (태풍영향권 내습파랑에 의한 직립방파제 이상침하 현상분석)

  • Lee, Joong-Koo;Kim, Hyo-Seob;Park, Koo-Yong;Ahn, Ik-Seong
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.21 no.6
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    • pp.508-517
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    • 2009
  • The real time movement of the caisson was measured when it was open to the waves during breakwater construction. As a result of measurement, no more settlement after the preloading in condition of designed loading was expected but sudden abnormal settlement took place through whole area of the breakwater when waves occurred by typhoon effect. To clarify the reason of this case, wave of the site has been reproduced and the equivalent wave pressure on the caisson was calculated. The numerical analysis of the effect of wave to the ground had been done. Site measurement data is in accordance with the result of numerical analysis.