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Advances in Civil Engineering
Volume 2012, Article ID 693506, 7 pages
Research Article

Pile Group Protection with Riprap Mattress

1Facultad de Ingeniería, Universidad de la República, Julio Herrera y Reissig 565, 11300 Montevideo, Uruguay
2Instituto de Ciencias del Mar, Consejo Superior de Investigación Científica (CSIC), Paseo Marítimo de la Barcelonesa 37-49, 08003 Barcelona, Spain

Received 18 November 2011; Accepted 8 February 2012

Academic Editor: Sami W. Tabsh

Copyright © 2012 Christian Chreties et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


New experimental data on plan dimensions for riprap mattresses used in pile group protection against edge failure are analyzed. The influence of flow conditions and the distance between piles in plan dimensions of riprap mattresses are addressed. An alternative methodology for the experimental study of edge failure in pile groups is proposed and verified, significantly reducing the duration of tests (from several days to a few hours) and yielding similar results. For the pile group configuration tested, a design expression for minimum riprap width is obtained. The influence of the distance between the piles on the width of riprap dimensions is shown to be small, and the proposed expression compares well with some of the expressions for single piers found in the literature.