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How to keep the fracture aperture constant under initial in-situ stress ?
Posted 26 nov. 2018, 22:44 UTC−5 Structural & Acoustics, Geomechanics, Porous Media Flow Version 5.3a 1 Reply
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Hi, I am using the elastic thin layer to simulate the deformation of fractures in geomechanics due to the fluid injection. The application of the initial in-situ stress will result in a reduction in the thickness of the elastic thin layer. But in fact, it is assumed that the elastic thin layer is in a mechanically stable state under the initial stress condition, that is, the initial mechanical aperture of the elastic thin layer (or fracture) does not change unless the effective stress changes subsequently due to the increase in pore pressure. So how do I keep the initial thickness of the fracture constant under initial in-situ stress? Is it by adding a pre-deformation sub-node? But it still doesn’t work. Someone can give me some advice?
Best Regards!
Song cai
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Please see the comment in https://www.comsol.com/blogs/how-to-model-adhesion-and-decohesion-in-comsol-multiphysics
Regards,
Henrik
Henrik Sönnerlind
COMSOL