Discrete numerical modelling of rockfill dams

The aim of this study is to obtain quantitative information on the behaviour of rockfill used in embankment dams, and particularly on the influence of block breakage on the displacement field, from a numerical analysis using the Distinct element method. A methodology is set up to define the resistance of the 2D particles so that the same probability of breaking blocks may be reproduced as in a 3D material. The model uses the discrete element code PFC2D (Itasca Consulting Group Inc., PFC2D (Particle Flow Code in Two Dimensions), Version 3.0, 2002) and considers breakable clusters of 2D balls. The different parameters are determined from experimental data obtained from laboratory tests performed on rock blocks. The model is validated by comparing the results of the simulation of shearing tests with actual triaxial tests on rockfill material published in the literature. The numerical analysis of block crushing in an actual dam is proposed in the last part of this paper. Copyright © 2006 John Wiley & Sons, Ltd.

[1]  F. Sidoroff,et al.  Homogenization for granular materials , 1995 .

[2]  Rémi Deluzarche.  Modélisation discrète des enrochements : Application aux barrages , 2004 .

[3]  Masanobu Oda,et al.  STRESS-INDUCED ANISOTROPY IN GRANULAR MASSES , 1985 .

[4]  P. Cundall,et al.  A discrete numerical model for granular assemblies , 1979 .

[5]  Nick Barton,et al.  SHEAR STRENGTH OF ROCKFILL , 1981 .

[6]  Matthew Richard Coop,et al.  On the Relationship between Particle Breakage and the Critical State of Sands , 2002 .

[7]  Malcolm D. Bolton,et al.  On the micromechanics of crushable aggregates , 1998 .

[8]  J. Biarez,et al.  Influence de la granulométrie et de son évolution par ruptures de grains sur le comportement mécanique de matériaux granulaires , 1997 .

[9]  R. J. Marsal,et al.  MECHANICAL PROPERTIES OF ROCKFILL , 1973 .

[10]  B. Hardin,et al.  Crushing of Soil Particles , 1985 .

[11]  D. Deere,et al.  Frictional Characteristics of Minerals , 1962 .

[12]  Jonathan D. Bray,et al.  CAPTURING NONSPHERICAL SHAPE OF GRANULAR MEDIA WITH DISK CLUSTERS , 1999 .

[13]  Yukio Nakata,et al.  A probabilistic approach to sand particle crushing in the triaxial test , 1999 .

[14]  H. Seed,et al.  Evaluation of Properties of Rockfill Materials , 1972 .

[15]  Eduardo Alonso,et al.  A review of Beliche Dam , 2005 .

[16]  E. Alonso,et al.  Testing rockfill under relative humidity control , 2004 .

[17]  J. C. Jaeger.  Failure of rocks under tensile conditions , 1967 .

[18]  Buddhima Indraratna,et al.  Large-scale triaxial testing of greywacke rockfill , 1993 .

[19]  M. Bolton,et al.  The fractal crushing of granular materials , 1996 .