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Dilatancy in slow granular flows.

Alexandre J Kabla1, Tim J Senden

  • 1Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom. ajk61@cam.ac.uk

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Granular materials expand when deformed, a principle called dilatancy. This study quantifies dilatancy in granular flow, revealing complex behaviors due to competing compaction effects.

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Area of Science:

  • Physics
  • Geophysics
  • Material Science

Background:

  • The Reynolds principle of dilatancy describes how granular materials expand when deformed, increasing pore space.
  • This phenomenon is commonly observed in wet sand but lacks sufficient analytical tools for in-depth study.
  • Applications span soil mechanics and geotechnics, highlighting the need for better understanding.

Purpose of the Study:

  • To analytically investigate the Reynolds principle of dilatancy in granular flow.
  • To quantify the intrinsic dilatancy behavior across various granular flow profiles.
  • To frame dilatancy as a kinematic process and explore competing factors.

Main Methods:

  • Utilized X-ray radiography to track granular flow profiles.
  • Quantified the intrinsic dilatancy behavior of granular materials.
  • Analyzed the interplay between dilatancy and flow-induced compaction.

Main Results:

  • Characterized dilatancy as a kinematic process in granular flow.
  • Observed that flow-induced compaction significantly competes with dilatancy.
  • Identified complex flow properties arising from the interaction of these two phenomena.

Conclusions:

  • Reynolds dilatancy is a kinematic process influenced by competing compaction effects.
  • A deeper understanding of granular flow requires considering both dilatancy and compaction.
  • This research provides a foundation for advanced analytical tools in granular mechanics.