DBPapers
DOI: 10.5593/SGEM2014/B12/S2.087

OPTIMIZATION OF RIVER BANK PROTECTION DESIGN BY DISCRETE ELEMENT METHOD

A. Priceputu, A. L. Bugea, C. Victor Rosu, M. S. Serbulea
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 683-690 pp

ABSTRACT
The river bank protection options are limited, in general, due to the ground conditions of the river bank and the necessity of limiting the stream velocity. The classical approach of using rip rap, and filling the river bank landscape up to the designed geometry is subjected to the random conditions of dropping and settlement of the boulders. In this case, the design, considering especially the quantitative estimation of the material needed, is based only on the designer’s experience. The paper aims to propose an up-to-date method of designing the rip rap, in order to reduce the stochastic impact of the technology and in situ conditions. The work is based on a forensic investigation of a real case study, which involved the local reconstruction of the Danube river bank by means of rip rap. The goal is attained by determining, using Monte Carlo simulations, the most probable rip rap configuration, through DEM (discrete element method) simulations. Furthermore, a validation process is carried out, based on the obtained results (number and size distribution of the boulders forming the rip rap), using coupled FEM-DEM analysis. The DEM Monte Carlo simulations are performed using a non-commercial software created by the authors, part of a research still in progress, while the coupled FEM-DEM computations used for validation purposes are ran using Abaqus software. The paper also shows strengths and weaknesses of both used methods and software, while providing some guidelines for future similar works.

Keywords: riprap, discrete element method, numerical modelling, Monte Carlo analysis.