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Particle shape effect on the structural evolution and force propagation inside the three-dimensional sandpile.

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Particle shape significantly influences sandpile structure and pressure distribution. Elongated particles create horizontal stress, causing a pressure dip, while flat particles retain initial structures, affecting force transmission.

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Area of Science:

  • Geotechnical Engineering
  • Computational Physics

Background:

  • Particle shape is a critical factor in granular material behavior.
  • Understanding granular flow and stress distribution in 3D sandpiles is essential for engineering applications.

Purpose of the Study:

  • To investigate the influence of particle shape on the pressure dip phenomenon in 3D sandpiles.
  • To analyze the structural characterization and force transmission mechanisms within sandpiles with varying particle aspect ratios.

Main Methods:

  • Discrete Element Method (DEM) simulations were utilized.
  • Three-dimensional sandpiles with particles of different aspect ratios were modeled.
  • Analysis focused on contact vectors, contact forces, and stress propagation.

Main Results:

  • Deviations from aspect ratio 1.0 caused rotation of contact vectors and forces away from the z-axis.
  • Flat particles exhibited better memory of initial structures, influencing force transmission.
  • Elongated particles generated significant horizontal stress, leading to a notable pressure dip phenomenon.

Conclusions:

  • Particle shape critically affects stress distribution and pressure dip in sandpiles.
  • The interplay between initial structure and deposition process, influenced by particle shape, governs sandpile behavior.
  • Accurate modeling of contact creation is necessary to capture the pressure profile in granular materials.