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- W4385065265 abstract "Abstract Dilatant hardening is an accepted model for the stabilizing effect of high pore fluid pressure on fault slip and operates when deformation is undrained. To test whether high pore fluid pressure impedes fault propagation under drained conditions, we deformed highly permeable Darley Dale sandstone using strain rates of 10 −4 s −1 , 10 −5 s −1 , and 10 −6 s −1 , respectively. For each strain rate, we compared the inelastic behaviors and faulting styles among rocks deformed under different pore fluid pressures ( P f ) (2–180 MPa). The confining pressure ( P c ) was attuned to the pore fluid pressure throughout deformation to maintain a constant differential pressure ( P c − P f ) of 10 MPa. In samples deformed at 10 −4 s −1 and 10 −5 s −1 , faulting behaviors were similar regardless of the magnitude of pore fluid pressure. However, when the strain rate was lowered to 10 −6 s −1 , we observed prolonged stress drops and slower slip velocities in samples deformed under high pore fluid pressures. In samples deformed at 10 −6 s −1 , we demonstrate that chemically assisted subcritical crack growth played an important role during faulting. A quantitative microstructural analysis revealed that slow faulting at slow strain rates was accompanied by pervasive microcracking and diffuse shear bands, which suggests pervasive subcritical cracking enabled slow faulting under drained conditions at the sample length scale. High pore fluid pressure may have facilitated slow faulting chemically by increasing the rate of subcritical cracking, mechanically via localized dilatant hardening, or both. Our results provide insight into the mechanics of faulting in natural settings where subcritical cracking is prevalent." @default.
- W4385065265 created "2023-07-23" @default.
- W4385065265 creator A5049500119 @default.
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- W4385065265 date "2023-07-29" @default.
- W4385065265 modified "2023-10-17" @default.
- W4385065265 title "Stabilizing Effect of High Pore Fluid Pressure on Fault Growth During Drained Deformation" @default.
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- W4385065265 doi "https://doi.org/10.1029/2023jb026536" @default.
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