Visualization of dominant stress-transfer mechanisms in experimental debris flows of different particle-size distribution
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Physical modeling of stress transfer in experimental debris flows.
This experimentally studies stress transfer mechanisms in debris flows, not research practice.
Physical modelling of debris-flow stress transfer; geotechnical domain science.
Résumé
Physical modelling of debris flow in a small-scale flume has been carried out to investigate the internal stress-transfer mechanisms within unsteady, saturated, and segregating granular free-surface flows. Measurements of the internal velocity fields within model flows were obtained via planar laser–induced fluorescence and particle image velocimetry. Normalized velocity profiles taken at a section over the flow duration were found to essentially collapse onto a single curve, the shape of which was dependent on the particle-size distribution. While all flows exhibited internal basal slip and shear, for tests on well-graded materials that are most representative of debris flows, the shear rate was found to reduce towards the surface to near-zero, exhibiting near plug-flow. Dimensional analysis shows that particles of different size within these flows experienced different dominant stress-transfer mechanisms — frictional, collisional or viscous. Rapid grain-size segregation therefore is both due to and results in different modes of stress transfer within a single flow. This means that in a segregating and hence, stratified system, different flow regimes will act concurrently at microscale and mesoscale. Results highlight the complexity of debris flows, so that it may be undesirable to ascribe a single microscale constitutive behaviour throughout, and further calls into question the concept of flow regimes for debris flows based on bulk measurements.
Conservé avec la notice de tri, où il sert de preuve aux étiquettes ci-dessus.
La notice
- Revue
- Canadian Geotechnical Journal
- Thématique
- Landslides and related hazards
- Domaine
- Environmental Science
- Établissements canadiens
- —
- Organismes subventionnaires
- Engineering and Physical Sciences Research Council
- Mots-clés
- Microscale chemistryMechanicsFlumeDebris flowParticle image velocimetryGeotechnical engineeringMesoscale meteorologyMaterials scienceDebrisGeologyShear stressFlow (mathematics)PhysicsMathematics
- Résumé présent dans OpenAlex
- oui