Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..353r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 55, Issue 3-4, p. 353-360.
Physics
5
Scientific paper
Cracks control the physical and mechanical properties of rocks. Using fracture mechanics, it is possible to analyse the behaviour of a single crack. From standard tests (double torsion, double cantilever beam), experimental data, obtained on various minerals and rocks in the sub-critical crack growth regime, lead to the conclusion that fracture strength is weakly rate dependent. Real rocks contain a population of cracks. Physical and mechanical properties of rocks must therefore be interpreted by combining the behaviour of a single crack with statistical methods. Two properties are considered here: permeability and fracture strength. Statistics and percolation theory show that there are two important thresholds for crack concentration: the first corresponds to the onset of permeability and the second to the development of macroscopic fracture.
Darot Michel
Gueguen Yves
Reuschlé Thierry
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