The transition from brittle faulting to cataclastic flow in porous sandstones: Mechanical deformation

Teng‐fong Wong; Christian David; Wenlu Zhu

doi:10.1029/96jb03281

journal article Feb 10, 1997

The transition from brittle faulting to cataclastic flow in porous sandstones: Mechanical deformation

Teng‐fong Wong Christian David

Wenlu Zhu

Journal of Geophysical Research: Oceans Vol. 102 No. B2 pp. 3009-3025 · American Geophysical Union (AGU)

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Abstract

Triaxial compression experiments were conducted to investigate the inelastic and failure behavior of six sandstones with porosities ranging from 15% to 35%. A broad range of effective pressures was used so that the transition in failure mode from brittle faulting to cataclastic flow could be observed. In the brittle faulting regime, shear‐induced dilation initiates in the prepeak stage at a stress level C' which increases with effective mean stress. Under elevated effective pressures, a sample fails by cataclastic flow. Strain hardening and shear‐enhanced compaction initiates at a stress level C* which decreases with increasing effective mean stress. The critical stresses C' and C* were marked by surges in acoustic emission. In the stress space, C* maps out an approximately elliptical yield envelope, in accordance with the critical state and cap models. Using plasticity theory, the flow rule associated with this yield envelope was used to predict porosity changes which are comparable to experimental data. In the brittle faulting regime the associated flow rule predicts dilatancy to increase with decreasing effective pressure in qualitative agreement with the experimental observations. The data were also compared with prediction of a nonassociative model on the onset of shear localization. Experimental data suggest that a quantitative measure of brittleness is provided by the grain crushing pressure (which decreases with increasing porosity and grain size). Geologic data on tectonic faulting in siliciclastic formations (of different porosity and grain size) are consistent with the laboratory observations.

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749

Citations

90

References

Details

Published: Feb 10, 1997
Vol/Issue: 102(B2)
Pages: 3009-3025
License: View

Authors

Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou, China

Cite This Article

Teng‐fong Wong, Christian David, Wenlu Zhu (1997). The transition from brittle faulting to cataclastic flow in porous sandstones: Mechanical deformation. Journal of Geophysical Research: Oceans, 102(B2), 3009-3025. https://doi.org/10.1029/96jb03281

The transition from brittle faulting to cataclastic flow in porous sandstones: Mechanical deformation

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