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Study on Movement Property of Cover Concrete Block

  • T. MoriEmail author
  • T. Zhang
  • Y. Awazu
  • S. Onaka
  • Y. Tajima
Conference paper

Abstract

In developing countries, there is a breakwater or groin that employs a concrete cellular caisson filled with stones covered by concrete blocks as an economical type of structure. However, it is reported that those concrete blocks are moved by wave action. There are currently only a few studies that concern the stability of concrete blocks at the water surface level. In this study, a hydraulic experiment was carried out to know the different effects on the stability and mobility of the cover concrete blocks due to several factors. These include variations in water level and in the type and crown height of concrete blocks. As a result, the stability of the blocks decreased in the case where the crown height of the blocks was higher than the crown surface of the caisson. This was also evident when the water level was near the crown surface of the caisson. As a recommendation, the stability of the blocks can be improved either by making a block with a high hole rate or by making a sloped surface at the crown of the block.

Keywords

Breakwater Cover Concrete Blocks Horizontal Wave Force Vertical Wave Force Uplift Force 

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References

  1. Fujiwara, R., Jinno, N., Kotake, Y., Shimosako K., and Matsumura, A.(2006). A Method for Reducing Uplift Pressure Using Cellular-Typed Composite Breakwater. Annual Journal of Coastal Engineering, JSCE,Vol.53, pp.766-770.Google Scholar
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  3. Tsuyoshi, A., Tsunehito, Y. and Koji, K.(2008). Damage Mechanism of Armor Blocks at Toe of Rubble Mound Foundation of Composite Breakwater. Annual Journal of Coastal Engineering, JSCE, Vol.55, pp.946-950.Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • T. Mori
    • 1
    Email author
  • T. Zhang
    • 2
  • Y. Awazu
    • 1
  • S. Onaka
    • 1
  • Y. Tajima
    • 2
  1. 1.Port and Airport Department Nippon Koei Co., LtdTokyoJapan
  2. 2.Department of Civil EngineeringThe University of Tokyo UniversityTokyoJapan

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