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SUMMARY:Injection-driven deformation of a soft granular material - Christo
 pher MacMinn\, Engineering\, Oxford
DTSTART:20141106T113000Z
DTEND:20141106T123000Z
UID:TALK54625@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Injection of fluid into a porous material will drive mechanica
 l deformation when the fluid pressure becomes comparable to the stiffness 
 or strength of the solid skeleton. This has applications ranging from the 
 geological storage of carbon dioxide to the recovery of natural gas from s
 hales via hydraulic fracture. However\, these problems are notoriously inc
 onvenient to study in a laboratory setting because of the difficulty of ac
 cessing the deformation field in a high-pressure system. Here\, we present
  a new experimental model system for performing dynamic\, high-resolution 
 measurement of poromechanical deformations: Fluid injection into a packing
  of soft particles. Using high-resolution imaging\, we measure the full de
 formation field and we study the dynamic interplay between grain-scale rea
 rrangements and macroscopic poromechanical response. We show that the defo
 rmation involves a complex combination of rearrangement\, shear failure\, 
 and the quasi-reversible storage and release of elastic energy. Despite th
 e grain-scale complexity\, we find that a minimal mathematical based on po
 roelasticity with viscous dissipation is able to capture certain macroscop
 ic (continuum-scale) aspects of our experiments.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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