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| Created: | Mar 24, 2021 at 2:52 p.m. | |
| Last updated: | Mar 24, 2021 at 2:59 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
Fractured rock permeability can increase by crack extension that creates additional flow pathways or by increases in crack openings that increase crack transmissivity. Understanding the partitioning between these two mechanisms during rock deformation is critical for conceptual models of fluid flow and transport in crystalline rocks and sedimentary layers with low matrix permeability and for the hydromechanics of crustal rocks. Using ice as a model for rock, new systematic experiments reveal that when subject to uniaxial loading at a constant strain rate, crack density remains nearly constant after the onset of percolation even while permeability increases, indicating that after the onset of percolation the increase in permeability is primarily due to the opening of existing cracks rather than the extension of cracks. These observations have implications for conceptual models of fractured rock permeability which often focus on the evolution of permeability with changing fracture density rather than changing fracture transmissivity and for attempts to link fractured rock permeability to seismic properties which often dominantly consider changes in crack density rather than crack apertures.
Data include summary of loading curves, elastic properties and permeabilities of crack networks created in uniaxially compressed freshwater ice
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Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
|---|---|---|
| National Science Foundation | Permeability and Elastic Properties of Fractured Rock: Systematic Experimental Investigation and Model Development | EAR – 1519706 |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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