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Journal of Porous Media
Facteur d'impact: 1.49 Facteur d'impact sur 5 ans: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Imprimer: 1091-028X
ISSN En ligne: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019026005
pages 987-1000

A STUDY OF THREE-PHASE FRACTURING IN GRANULAR MEDIA USING HIGH-SPEED IMAGING

Deren Ozturk
Energy Safety Research Institute, Swansea University, Bay Campus, Swansea SA1 8EN, United Kingdom
Bjørnar Sandnes
Energy Safety Research Institute, Swansea University, Bay Campus, Swansea SA1 8EN, United Kingdom

RÉSUMÉ

Using high-speed imaging and digital image correlation, we studied the granular motion and deformation caused by pneumatic fracturing of a wet granular packing in a Hele–Shaw cell subject to a constant injection of air. These pneumatic fractures form patterns of conductive pathways whose form is determined by a complex interplay between pressure, capillary, frictional, and viscous forces. Saturated granular media is pneumatically fractured in this fashion in multiple natural, geo-engineering, and industrial processes. We outline the characteristics of these fracture networks and then examine individual fracture growth events and the local motion of grains with a time resolution of milliseconds. We observe intermittent frictional behavior during these rapid fracturing events, describe an average velocity profile for the motion of grains during fracturing, and illustrate an average compaction profile as a result of these deformations.

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