Effect of pore pressure buildup on slowness of rupture propagation
Abstract
Abstract Pore fluid pressure is known to play an important role in brittle fracture initiation and propagation, yet the underlying mechanisms remain unclear. We conducted triaxial experiments on saturated porous sandstones to investigate effects of pore pressure buildup on the slowness of shear rupture propagation at different confining pressures. At low to intermediate confinements, rocks fail by brittle faulting, and pore pressure buildup causes a reduction in rock's shear strength but does not induce measurable differences in slip behavior. When the confinement is high enough to prohibit dynamic faulting, rocks fail in the brittle‐ductile transitional regime. In the transitional regime, pore pressure buildup promotes slip instability on an otherwise stably sliding fracture. Compared to those observed in the brittle regime, the slip rate, stress drop, and energy dissipated during rupture propagation with concurrent pore pressure buildup in the transitional regime are distinctively different. When decreasing confining pressure instead, the slip behavior resembles the ones of the brittle regime, emphasizing how the observed slowness is related to excess pore pressure beyond the effective pressure phenomenon. Analysis of the mechanical data using existing theoretical models confirms these observations. Quantitative microstructural analyses reveal that increasing pore pressure lessens the dilatancy hardening during failure,more »
- Authors:
-
- Univ. of Maryland, College Park, MD (United States); British Geological Survey, Nottingham (United Kingdom)
- Univ. of Maryland, College Park, MD (United States)
- Publication Date:
- Research Org.:
- Univ. of Maryland, College Park, MD (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1468400
- Alternate Identifier(s):
- OSTI ID: 1402159
- Grant/Contract Number:
- FG02-07ER15916; DE‐FG02‐07ER15916
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 12; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; shear fracture; brittle‐ductile transition; rock physics; lab experiments; porous rocks; slow slips
Citation Formats
Ougier-Simonin, Audrey, and Zhu, W. Effect of pore pressure buildup on slowness of rupture propagation. United States: N. p., 2015.
Web. doi:10.1002/2015JB012047.
Ougier-Simonin, Audrey, & Zhu, W. Effect of pore pressure buildup on slowness of rupture propagation. United States. https://doi.org/10.1002/2015JB012047
Ougier-Simonin, Audrey, and Zhu, W. Thu .
"Effect of pore pressure buildup on slowness of rupture propagation". United States. https://doi.org/10.1002/2015JB012047. https://www.osti.gov/servlets/purl/1468400.
@article{osti_1468400,
title = {Effect of pore pressure buildup on slowness of rupture propagation},
author = {Ougier-Simonin, Audrey and Zhu, W.},
abstractNote = {Abstract Pore fluid pressure is known to play an important role in brittle fracture initiation and propagation, yet the underlying mechanisms remain unclear. We conducted triaxial experiments on saturated porous sandstones to investigate effects of pore pressure buildup on the slowness of shear rupture propagation at different confining pressures. At low to intermediate confinements, rocks fail by brittle faulting, and pore pressure buildup causes a reduction in rock's shear strength but does not induce measurable differences in slip behavior. When the confinement is high enough to prohibit dynamic faulting, rocks fail in the brittle‐ductile transitional regime. In the transitional regime, pore pressure buildup promotes slip instability on an otherwise stably sliding fracture. Compared to those observed in the brittle regime, the slip rate, stress drop, and energy dissipated during rupture propagation with concurrent pore pressure buildup in the transitional regime are distinctively different. When decreasing confining pressure instead, the slip behavior resembles the ones of the brittle regime, emphasizing how the observed slowness is related to excess pore pressure beyond the effective pressure phenomenon. Analysis of the mechanical data using existing theoretical models confirms these observations. Quantitative microstructural analyses reveal that increasing pore pressure lessens the dilatancy hardening during failure, thus enhances slip along the localized zone in the transitional regime. Our experimental results suggest that pore pressure buildup induces slow slip in the transitional regime, and slip rates along a shear fracture may vary considerably depending on effective stress states.},
doi = {10.1002/2015JB012047},
journal = {Journal of Geophysical Research. Solid Earth},
number = 12,
volume = 120,
place = {United States},
year = {Thu Nov 12 00:00:00 EST 2015},
month = {Thu Nov 12 00:00:00 EST 2015}
}
Web of Science
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