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Finite width of shear zones
Bertrand Francois1, Frédéric Lacombe, Hans J Herrmann
1PMMH-ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
Summary
This study estimates shear zone width using a simple model, linking finite size to force line propagation within the medium. The model predicts a shear zone width of approximately ten grain diameters.
Area of Science:
- Geophysics
- Material Science
- Rock Mechanics
Background:
- Shear zones are critical geological features.
- Understanding their finite width is essential for predicting material behavior under stress.
Purpose of the Study:
- To present experimental and numerical results for estimating shear zone width.
- To associate the finite size of shear zones with internal physical processes.
Main Methods:
- Development of a simple model for shear zone width estimation.
- Incorporation of force distribution and dilatancy arguments.
- Experimental and numerical simulations.
Main Results:
- The finite width of shear zones is linked to the propagation of force lines.
- The proposed model provides an estimate for shear zone width.
Conclusions:
- The model successfully predicts a shear zone width of approximately ten grain diameters.
- Force line propagation is a key factor in determining shear zone dimensions.