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http://dx.doi.org/10.3741/JKWRA.2008.41.4.445

An Experimental Study to Evaluate the Subsidence Stability of Riprap Protection without Filters  

Ji, Un (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Yeo, Woon-Kwang (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Lee, Won-Min (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Publication Information
Journal of Korea Water Resources Association / v.41, no.4, 2008 , pp. 445-454 More about this Journal
Abstract
Many countermeasures for local scour at bridge piers constructed on the river and sea have been developed and researched to protect piers against local scour. The most commonly employed method is riprap protection, which is sometimes required the filter installation between riprap and base layers. However, the construction of stone filters are really hard to perform in the field, require the high cost, or sometimes are impossible. The experimental modeling is conducted to analyze the riprap failure modes and the stability of riprap protection without filters based on the different approach velocity and riprap layer thickness conditions. Also, the stability index to evaluate the performance of riprap protection is developed using the experimental results. The cover and thickness of the riprap layer play a very important role in the stability and thicker riprap layers can prevent a total disintegration of the riprap layer effectively, especially due to winnowing failure.
Keywords
pier scour; riprap protection; winnowing failure; riprap subsidence;
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