Comptes Rendus
no. 4
Crack tip behavior in near-surface fluid-driven fracture experiments
[Étude expérimentale du comportement en bout d'une fracture hydraulique se propageant près d'une surface libre]

Présenté par : Hui Duong Bui

Andrew P. Bunger1  ; Emmanuel Detournay2  ; Robert G. Jeffrey1
1 CSIRO Division of Petroleum Resources, Melbourne, Australia
2 Department of Civil Engineering, University of Minnesota, Minneapolis, MN 55455, USA
Comptes Rendus. Mécanique, Volume 333 (2005) no. 4, pp. 299-304.

Cette Note présente les résultats d'une campagne expérimentale visant évaluer l'effet de la viscosité du fluide, quantifiée à l'aide d'un paramètre adimensionnel, sur l'ouverture en bout d'une fracture hydraulique. Les résultats expérimentaux confirment que la région en tête de fissure est conforme au comportement en racine carrée predit par la mécanique de la rupture fragile, tant que le paramètre viscosité est petit. Au contraire, lorsque ce paramètre est d'ordre 1, et que la cavité entre le front fluide et l'extrémité de la fracture couvre moins de 30 % du rayon de la fracture, l'ouverture en bout de fissure vérifie une solution asymptotique intermédiaire, résultant du couplage fluide/solide.

This Note presents experimental results for the near-tip fracture opening of fluid-driven fractures. The effect of fluid viscosity, quantified by a dimensionless parameter, was varied between tests. The tip region closely followed the classical square-root behavior from linear elastic fracture mechanics when the viscosity parameter was small. Conversely, when the viscosity parameter was of order one and the lag between the fluid-filled region and the fracture front accounted for less than 30% of the fracture, the tip region behaved according to a known intermediate asymptotic solution which results from the solid/fluid coupling.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2005.01.004
Keywords: Rupture, Hydraulic fracture, Fracture mechanics
Mot clés : Rupture, Fracturation hydraulique, Mécanique de la rupture fragile
Andrew P. Bunger 1 ; Emmanuel Detournay 2 ; Robert G. Jeffrey 1

1 CSIRO Division of Petroleum Resources, Melbourne, Australia
2 Department of Civil Engineering, University of Minnesota, Minneapolis, MN 55455, USA 
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Andrew P. Bunger; Emmanuel Detournay; Robert G. Jeffrey. Crack tip behavior in near-surface fluid-driven fracture experiments. Comptes Rendus. Mécanique, Volume 333 (2005) no. 4, pp. 299-304. doi : 10.1016/j.crme.2005.01.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2005.01.004/

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