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Related Experiment Video

Updated: Jun 7, 2026

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

Published on: September 29, 2019

Hard X-ray imaging for landslide research.

B M Weon1, J H Je, G Gremaud

  • 1Department of Physics, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA. bmweon@seas.harvard.edu

Journal of Synchrotron Radiation
|October 27, 2010
PubMed
Summary

Synchrotron imaging visualizes wet granular flows and landslide dynamics. Stress accumulation follows power-law and relaxation follows exponential patterns, with their trade-off initiating landslides.

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Area of Science:

  • Geophysics
  • Material Science
  • Physics

Background:

  • Understanding granular flows and landslide dynamics is crucial for hazard assessment.
  • Direct visualization of granular materials in complex environments, like fully wet conditions, remains challenging.

Purpose of the Study:

  • To directly visualize landslide dynamics and granular flows in fully wet granular piles.
  • To investigate the stress evolution during granular flow and landslide initiation.

Main Methods:

  • Utilized synchrotron phase-contrast hard X-ray imaging for high-resolution visualization.
  • Employed hard X-rays for deep penetration and phase-contrast enhancement to track granular movement in water.

Main Results:

  • Achieved highly efficient direct visualization of granular flow dynamics in wet conditions.
  • Observed power-law evolution for stress accumulation and exponential evolution for stress relaxation.
  • Identified the trade-off between stress accumulation and relaxation as the trigger for landslide onset.

Conclusions:

  • Synchrotron phase-contrast hard X-ray imaging is effective for studying wet granular flows.
  • The stress dynamics reveal distinct power-law and exponential behaviors preceding landslide initiation.