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Multi-scale nature of granular media

jandrade's picture

I am happy to announce the launching of our website for the computational geomechanics laboratory at Northwestern University. Please visit the site at


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Sendy F. Tantono's picture

Hi Jose,

Those pictures you show are very interesting subjects. Did you also observe the occurrence of particle rotation inside the shear band in laboratory ? Besides the works by Oda & Kazama (1998), Uesugi et al (1986,1988), do u also have other references about the occurrence of particle rotation inside the shear band either within granular body or very close to the interface between granular and continuum structure?


jandrade's picture

Hi Sendy,It is indeed the case that there is significant particle rotation inside shear bands. There have been both laboratory observations 
Oda, M., Takemura, T. & Takahashi, M. (2004). Ge´otechnique 54, No. 8, 539–542
and numerical observations using DEM
J. P. Bardet and J. Proubet. A numerical investigation of the structure of persistent shear bands in granular media. Geotechnique, 41:599-613, 1991

This is an interesting research topic; the last research I had known about in this area was a series of 2-D DEM simulations in the thesis of Nabha Rege in 1996 (see here) which showed the formation of rotation cells when homogeneous strain effects were filtered.

Cheers Jose.

Jose, I think the topic is very interesting.

I want to ask a question about sand modeling. Computer graphics people work on modeling of sands for making movies or games.

What do you think about their models?


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