Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..723m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 6, p. 723-726
Mathematics
Logic
9
Brittleness, Deformation, Failure Modes, Geological Faults, Plastic Properties, Rocks, Stress Analysis, Fracture Mechanics, Predictions, Stresses
Scientific paper
This paper discusses Coulomb failure criteria for brittle deformation of intact rock and fault gouge. Data are presented from laboratory experiments designed to identify the critical gouge layer thickness required to effect a transition from the standard Coulomb criterion to a modified failure law (referred to as Coulomb plasticity) appropriate for simple shear of a gouge layer. Experiments were carried out using tension fractures and quartz powder to simulate granular fault gouge. Fractures sheared without gouge obey the standard Coulomb law. A 0.6 mm-thick gouge layer was required to effect the transition to Coulomb plasticity. I test and reject the hypothesis that fault zone strength and apparent coefficient of internal friction can be predicted from fracture of intact rock simply by accounting for differences in the failure laws and without considering variations in the Coulomb parameters. The data presented indicate that the stress state required for Coulomb plasticity is not developed within very thin gouge layers. This work implies that brittle fault zones have lower friction than predictions based on the strength of intact rock. However, the magnitude of this weakening effect is small (for example, a coefficient of sliding friction of 0.75 would be reduced to 0.6) and thus it is not an independent explanation of the apparent weakness of mature faults.
No associations
LandOfFree
Fault zone strength and failure criteria does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fault zone strength and failure criteria, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fault zone strength and failure criteria will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-885757