Computer simulated experiments, in which direct numerical simulation
of the interactions between the constituent particles of a large
system of particles is performed, are now applied to a wide range of
engineering problems [1]. The general potential value of this
approach is the ability to examine data which is normally
inaccessible, to perform rigorous parametric studies and explore
technological innovation prior to prototype testing. In the context
of soil mechanics, the technique may be used in the following ways.
1) To provide experimental data for complex loading paths [2] and
therefore replace (?) or be a useful precursor to real experiments in
the laboratory.
Without this, what checks do we have on the experiments?
2) To develop new continuum models which link the information at the
micro, meso and macroscales using statistical mechanics,
homogenisation techniques, etc.
Can we? Is it worthwhile?
3) Provide information about the physics occurring at the grain scale
[3] in order to validate the concepts and explain the meaning of the
parameters used in conventional elastoplastic/hypoplastic continuum
models.
Such new information may also change our everyday thinking and
encourage more rational ideas.
The presentation will focus on the physics of the grain scale
behaviour of granular media and discuss the origins of shear strength,
the role of interparticle friction and the significance of plastic
deformation at the interparticle contacts. From the results presented
it is hoped to demonstrate that, in soil mechanics, we should not use
the F word.
References
1. Thornton C. (2000). Special Issue on Numerical Simulations of
Discrete Particle Systems, Powder Technology 109.
2. Thornton C. (2000). Numerical simulations of deviatoric shear
deformation of granular media. Geotechnique 50, 43-53.
3. Thornton C. & Antony S. J. (1998). Quasi-static deformation of
particulate media. Phil. Trans. Roy. Soc. London A 356, 2763-2782.
