Scour countermeasures for cylindrical piers using riprap and combination of collar and riprap  

作　　者：Amir R. ZARRATI Mohammad R. CHAMANI Abolfazl SHAFAIE Milad LATIFI 

机构地区：[1]Dept. of Civil and Environmental Engineering, Amirkabir University of Technology [2]Dept. of Civil Engineering, Isfahan University of Technology [3]Dept. Civil Engineering, Isfahan University of Technology

出　　处：《International Journal of Sediment Research》2010年第3期313-321,共9页国际泥沙研究（英文版）

摘　　要：Various methods are proposed to control scouring around bridge piers. In the present study application of riprap alone and combinations of riprap and collar were examined experimentally for scour control around cylindrical bridge piers. Tests were conducted with seven riprap sizes and with two different sizes of collars. Empirical equations were developed for stable riprap diameter for two cases of piers with and without collar protection. Extent of riprap layer is also presented for these two cases. The results showed that in the range of b/dR≤7.5 （where b is pier diameter and dR is riprap size） using a collar reduced the stable riprap size. It was also concluded that using collar reduced the riprap layer extension in front and sides of the pier.Various methods are proposed to control scouring around bridge piers. In the present study application of riprap alone and combinations of riprap and collar were examined experimentally for scour control around cylindrical bridge piers. Tests were conducted with seven riprap sizes and with two different sizes of collars. Empirical equations were developed for stable riprap diameter for two cases of piers with and without collar protection. Extent of riprap layer is also presented for these two cases. The results showed that in the range of b/dR≤7.5 （where b is pier diameter and dR is riprap size） using a collar reduced the stable riprap size. It was also concluded that using collar reduced the riprap layer extension in front and sides of the pier.

关 键 词：SCOUR COUNTERMEASURES Cylindrical Piers COLLAR RIPRAP 

分 类 号：U213.1[交通运输工程—道路与铁道工程]