On the micro mechanics of one-dimensional normal compression

Discrete-element modelling has been used to investigate the micro mechanics of one-dimensional compression. One-dimensional compression is modelled in three dimensions, using an oedometer and a large number of particles, and without the use of agglomerates. The fracture of a particle is governed by...

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Bibliographic Details
Published in:Géotechnique 2013-09, Vol.63 (11), p.895-908
Main Authors: MCDOWELL, G. R, DE BONO, J. P
Format: Article
Language:English
Subjects:
Aggregates
Atoms & subatomic particles
Bond strength
Compressing
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Engineering geology
Evolution
Exact sciences and technology
Fracture mechanics
Fracturing
Mathematical models
Mechanics
Shear strength
Shear stress
Strength
Studies
Three dimensional models
Yield stress
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Summary:Discrete-element modelling has been used to investigate the micro mechanics of one-dimensional compression. One-dimensional compression is modelled in three dimensions, using an oedometer and a large number of particles, and without the use of agglomerates. The fracture of a particle is governed by the octahedral shear stress, within the particle due to the multiple contacts and a Weibull distribution of strengths. Different fracture mechanisms are considered, and the influence of the distribution of fragments produced for each fracture on the global particle size distribution and the slope of the normal compression line is investigated. Using the discrete-element method, compression is related to the evolution of a fractal distribution of particles. The compression index is found to be solely a function of the strengths of the particles as a function of size.
ISSN:0016-8505
1751-7656
DOI:10.1680/geot.12.P.041