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Related Experiment Videos

Stresses in silos: comparison between theoretical models and new experiments

Vanel1, Claudin, Bouchaud

  • 1L.M.D.H., Universite Paris VI, 4 place Jussieu-case 86, 75005 Paris, France.

Physical Review Letters
|October 4, 2000
PubMed
Summary

We measured granular column pressure, finding it increases linearly with added weight but non-monotonically with height. These findings support a local stress relationship, challenging classical models.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Material Science

Background:

  • Understanding granular material behavior under pressure is crucial in fields like engineering and geology.
  • Classical models, such as the Janssen approximation, provide a basic framework but may not capture complex behaviors.

Purpose of the Study:

  • To present precise and reproducible measurements of mean pressure at the base of a cylindrical granular column.
  • To investigate the relationship between applied overload, column height, and bottom pressure.
  • To test the validity of existing theoretical models for granular materials.

Main Methods:

  • Experimental setup involving a cylindrical column filled with granular material.
  • Application of controlled, constant overloads to the granular column.

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  • Precise measurement of the mean pressure at the bottom of the column.

    • Main Results:

    • The measured pressure at the column base exhibited a linear relationship with the applied overload.
    • The pressure demonstrated a non-monotonic behavior with respect to the column height.
    • The experimental data were found to be quantitatively consistent with a local, linear stress relationship.

    Conclusions:

    • The findings support a recently proposed local, linear relation between stress components in granular materials.
    • The results contradict the simplest classical Janssen approximation.
    • The data provide a stringent test for competing granular material models.