• Title/Summary/Keyword: rubble-mound

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Non-destructive Inspection of the Half-loc of rubble mound breakwater (경사식 방파제의 중간피복용블록의 비파괴검사)

  • 강보순;김광호;이갑중;권혁민;조성호
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.777-782
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    • 2001

  • Occurrence of crack in the Half-loc of rubble mound breakwater under T.T.P (Tetrapod) can cause serious problems in structural safety. There, probing of such cracks in marine structures is an important process in evaluating the overall integrity of structures. Ultrasonic, SASW(Spectral-Analysis-of-Surface-Waves)and Impect-Echo methods were used for the inspection of pilot concrete and SFC (Steel Fiber Concrete) block in this study. The advantage and limitations of these methods for non-destructive inspection in concrete blocks are investigated. As a result, it has been verified that these methods proved to present effective solution for detecting the crack of the pilot concrete block.

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Nonlinear Uplift Wave Pressure Distribution Acting on the Caisson of Composite Breakwater (혼성방파제의 케이슨에 작용하는 비선형양압력분포에 관한 연구)

  • 김도삼;배기성
    • Journal of Ocean Engineering and Technology
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    • v.15 no.4
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    • pp.20-27
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    • 2001

  • Recently numerical approaches for wave loads acting on the vertical caisson of breakwater, and resulting wave reflection and transmission coefficients have been performed. Although the numerical studies by Sulisz's(1997) and Kim et al.(2000) are suggested representatively, theoretical formulation for nonlinear wave pressure is not developed yet. And experimental results of Sulisz(1997) revealed that nonlinear uplift pressure on the caisson may be produced largely on the case of caisson founded on the high rubble mound. From the results of this study, the nonlinear theory for the uplift wave pressure acting on the caisson by applying boundary integral method of Green theorem is formulated, and also the characteristics of nonlinear uplift pressure and run-up height on the caisson are evaluated numerically, according to the variations of hydraulic properties of the rubble mound.

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Reflection and Dissipation Characteristics of Non-overtopping Quarter Circle Breakwater with Low-mound Rubble Base

  • Balakrishna, K;Hegde, Arkal Vittal;Binumol, S
    • Journal of Advanced Research in Ocean Engineering
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    • v.1 no.1
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    • pp.44-54
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    • 2015

  • Breakwaters are the coastal structures constructed either perpendicular (shore connected) or parallel (detached) to the coast. The main function of breakwater is to create a tranquil medium on its leeside by reflecting the waves and also dissipating the wave energy arriving from seaside, resulting in ease of manoeuvrability to boats or ships to their berthing places. Different types of breakwaters are being used at present, such as rubble mound breakwater, vertical wall type breakwater and composite breakwater. The objective of this paper is to investigate reflection coefficients (Kr) and dissipation (loss) coefficients (Kl) for physical models of Quarter circle caisson breakwater of three different radii of 0.550 m, 0.575 m and 0.600 m with S/D ratio of 2.5 (S=spacing between perforations, D=diameter of perforations). The models were tested in the monochromatic wave flume of the department, for different incident wave heights (Hi), Wave periods (T) and water depths (d). It was observed that reflection coefficient increased with increase in the wave steepness (Hi/gT2) and decreased with increase in depth parameter (d/gT2) and hs/d (Height of structure including rubble base/depth of water). The loss coefficient decreased with increase in the wave steepness and increased with increase in depth parameter and hs/d.

  • https://doi.org/10.5574/JAROE.2015.1.1.044 인용 PDF

Probability of Failure of Armor Units on Rubble-mound Breakwater with Safety Factor (안전계수에 따른 경사제 피복재의 파괴확률)

  • 이철응;안성모
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.13 no.1
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    • pp.9-17
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    • 2001

  • A probability of failure of armor units on rubbJe-mound breakwater are evaluated by using the direct method for reliability analysis, which is represented as a function of safety factor that has been extensively used in practical design. The reliability function is fonnulated based on Hudson formula suggested for designing the stable size of armor units on rubble-mound breakwater. Several kinds of stability coefficient are applied separately to calculate the probability of failure with respect to the type of armor units, breaking/nonbreaking and the correlation coefficients between random variables. [n addition, the sensitivity analyses are carried out to investigate quantitatively into the effects of each random variable in the reliability function on the probability of failure.

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