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Investigating Compaction by Intergranular Pressure Solution Using the Discrete Element Method.

M P A van den Ende1, G Marketos1,2, A R Niemeijer1

  • 1High Pressure and Temperature Laboratory, Department of Earth Sciences Utrecht University Utrecht Netherlands.

Journal of Geophysical Research. Solid Earth
|March 16, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a 3D discrete element method (DEM) to simulate pressure solution creep, offering a more realistic approach than traditional models. The DEM model accurately reproduces experimental compaction rates and reveals insights into factors influencing deformation.

Keywords:
compactiondiscrete element methodfrictionpressure solution

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Area of Science:

  • Geophysics
  • Earth Sciences
  • Materials Science

Background:

  • Intergranular pressure solution creep is a key deformation mechanism in the Earth's crust.
  • Existing analytical models simplify aggregate geometry and grain size distribution, often neglecting shear tractions and overestimating compaction at low porosities.
  • The underlying mechanisms for discrepancies in analytical models remain unclear.

Purpose of the Study:

  • To develop and validate a 3D discrete element method (DEM) model for simulating intergranular pressure solution creep.
  • To explicitly model individual grains, overcoming limitations of analytical models.
  • To investigate the sensitivity of compaction rates to grain size, applied stress, interparticle friction, and grain size distribution.

Main Methods:

  • A conceptually simple, 3-D discrete element method (DEM) approach was employed.
  • The DEM model explicitly simulated individual grains, relaxing assumptions of analytical models.
  • Model validation was performed by comparing macroscopic sample compaction rates against experimental data.

Main Results:

  • The DEM model successfully reproduced realistic compaction behavior and strain rates consistent with uniaxial compaction experiments.
  • Simulations confirmed characteristic dependencies of strain rate on grain size and applied stress, aligning with analytical predictions.
  • Interparticle friction and distributed grain size were found to influence compaction rates by less than half an order of magnitude.

Conclusions:

  • The 3D DEM approach provides a robust and validated method for simulating intergranular pressure solution creep.
  • DEM simulations offer a more detailed understanding of deformation mechanisms compared to traditional analytical models.
  • The study highlights the significant, yet quantitatively limited, impact of interparticle friction and grain size distribution on creep behavior.