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Janssen effect in submerged granular columns.

M Aguilar-González1, D Maza2, F Pacheco-Vázquez1

  • 1Instituto de Física, Benemérita Universidad Autónoma de Puebla, A. P. J-48, Puebla 72570, Mexico. fpacheco.at.ifuap.buap.mx.

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This summary is machine-generated.

Interstitial liquid significantly impacts pressure saturation in granular columns, modifying the Janssen effect. The particle density relative to the liquid is key, with saturation diminishing as densities approach each other.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • The Janssen effect describes pressure saturation in granular columns, typically studied in dry conditions.
  • Understanding fluid-grain interactions is crucial for various industrial and geological processes.

Purpose of the Study:

  • To experimentally investigate the influence of interstitial liquid on the Janssen effect in confined granular columns.
  • To analyze how particle density relative to the fluid affects pressure saturation.
  • To develop a model accounting for hydrostatic stress and buoyancy.

Main Methods:

  • Experiments were conducted using a cylindrical container with granular columns.
  • The study compared dry granular columns to those filled with water.
  • Two scenarios were examined: grains denser than water (sedimenting) and grains less dense than water (buoyant).

Main Results:

  • A Janssen-like effect was observed, dependent on the particle-to-liquid density ratio.
  • Stress saturation decreased as particle density approached liquid density.
  • A buoyancy-driven Janssen effect was identified for buoyant grains, successfully modeled by accounting for hydrostatic stress.

Conclusions:

  • Interstitial liquids significantly alter pressure saturation in granular columns.
  • The particle density ratio to the fluid is a critical factor in the observed Janssen effect.
  • Grain-to-grain stress transmission remains important even in fluid-suspended granular systems.