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- W3080853345 endingPage "107038" @default.
- W3080853345 startingPage "107038" @default.
- W3080853345 abstract "Strain localisation structures, such as shear fractures and compaction bands, are of importance due to their influence on permeability and therefore outgassing, a factor thought to influence eruptive style. In this study, we aim to develop a better understanding of strain localisation in porous volcanic rocks using X-ray tomographic images of samples of porous andesite (porosity = 0.26) acquired before and after deformation in the brittle and ductile regimes. These 3D images have been first analysed to provide 3D images of the porosity structure within the undeformed andesite, which consists of a large, well-connected porosity backbone alongside many smaller pores that are either isolated or connected to the porosity backbone by thin microstructural elements (e.g., microcracks). Following deformation, porosity profiles of the samples show localised dilation (porosity increase) and compaction (porosity reduction) within the samples deformed in the brittle and ductile regimes, respectively. Digital volume correlation (DVC) of the images before and after triaxial deformation was used to quantify the tensor strain fields, and the incremental divergence (volumetric strain) and curl (used as an indicator of shear strain) of the displacement fields were calculated from the DVC. These fields show that strain localisation in the sample deformed in the brittle regime manifested as a ~ 1 mm-wide, dilatational shear fracture oriented at an angle of 40–45° to the maximum principal stress. Pre- and post-deformation permeability measurements show that permeability of the sample deformed in the brittle regime increased from 3.9 × 10−12 to 4.9 × 10−12 m2, which is presumed to be related to the shear fracture. For the sample deformed in the ductile regime, strain localised into ~1 mm-thick, undulating compaction bands orientated sub-perpendicular to the maximum principal stress with little evidence of shear. Taken together, our data suggest that these bands formed during large stress drops seen in the mechanical data, within high-porosity zones within the sample, and within the large, well-connected porosity backbone. Pre- and post-deformation permeability measurements indicate that inelastic compaction decreased the permeability of the sample by a factor of ~3. The data of this study assist in the understanding of strain localisation in porous volcanic rocks, its influence on permeability (and therefore volcanic outgassing), and highlight an important role for DVC in studying strain localisation in volcanic materials." @default.
- W3080853345 created "2020-09-01" @default.
- W3080853345 creator A5007543278 @default.
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- W3080853345 creator A5072534604 @default.
- W3080853345 creator A5074876851 @default.
- W3080853345 creator A5087128702 @default.
- W3080853345 date "2020-10-01" @default.
- W3080853345 modified "2023-10-16" @default.
- W3080853345 title "Imaging strain localisation in porous andesite using digital volume correlation" @default.
- W3080853345 cites W1839486291 @default.
- W3080853345 cites W1872330980 @default.
- W3080853345 cites W1914962688 @default.
- W3080853345 cites W1950290430 @default.
- W3080853345 cites W1953820895 @default.
- W3080853345 cites W1966410207 @default.
- W3080853345 cites W1968633966 @default.
- W3080853345 cites W1969282319 @default.
- W3080853345 cites W1970495290 @default.
- W3080853345 cites W1970647892 @default.
- W3080853345 cites W1972275555 @default.
- W3080853345 cites W1972313145 @default.
- W3080853345 cites W1985445769 @default.
- W3080853345 cites W1987466831 @default.
- W3080853345 cites W1988011821 @default.
- W3080853345 cites W1988378978 @default.
- W3080853345 cites W1988730566 @default.
- W3080853345 cites W1991463636 @default.
- W3080853345 cites W1992283613 @default.
- W3080853345 cites W1992966130 @default.
- W3080853345 cites W2000112504 @default.
- W3080853345 cites W2002259854 @default.
- W3080853345 cites W2003623474 @default.
- W3080853345 cites W2005063387 @default.
- W3080853345 cites W2007988185 @default.
- W3080853345 cites W2016435869 @default.
- W3080853345 cites W2020284093 @default.
- W3080853345 cites W2022367675 @default.
- W3080853345 cites W2022453648 @default.
- W3080853345 cites W2026399598 @default.
- W3080853345 cites W2026657109 @default.
- W3080853345 cites W2029378882 @default.
- W3080853345 cites W2029616746 @default.
- W3080853345 cites W2030339687 @default.
- W3080853345 cites W2035270899 @default.
- W3080853345 cites W2036293513 @default.
- W3080853345 cites W2036321198 @default.
- W3080853345 cites W2037617008 @default.
- W3080853345 cites W2038405013 @default.
- W3080853345 cites W2039730779 @default.
- W3080853345 cites W2040505957 @default.
- W3080853345 cites W2043226230 @default.
- W3080853345 cites W2050425513 @default.
- W3080853345 cites W2050868065 @default.
- W3080853345 cites W2051047535 @default.
- W3080853345 cites W2053956340 @default.
- W3080853345 cites W2057038751 @default.
- W3080853345 cites W2064161173 @default.
- W3080853345 cites W2066723358 @default.
- W3080853345 cites W2072013994 @default.
- W3080853345 cites W2072534150 @default.
- W3080853345 cites W2073231907 @default.
- W3080853345 cites W2073666234 @default.
- W3080853345 cites W2073999202 @default.
- W3080853345 cites W2076923774 @default.
- W3080853345 cites W2077859127 @default.
- W3080853345 cites W2079154948 @default.
- W3080853345 cites W2081230043 @default.
- W3080853345 cites W2082983568 @default.
- W3080853345 cites W2091895165 @default.
- W3080853345 cites W2093490785 @default.
- W3080853345 cites W2098674559 @default.
- W3080853345 cites W2100900164 @default.
- W3080853345 cites W2104757122 @default.
- W3080853345 cites W2111272962 @default.
- W3080853345 cites W2113032270 @default.
- W3080853345 cites W2120658260 @default.
- W3080853345 cites W2128813971 @default.
- W3080853345 cites W2130409464 @default.
- W3080853345 cites W2133228730 @default.
- W3080853345 cites W2136548340 @default.
- W3080853345 cites W2149924560 @default.
- W3080853345 cites W2152736918 @default.
- W3080853345 cites W2163759526 @default.
- W3080853345 cites W2167857779 @default.
- W3080853345 cites W2194845795 @default.
- W3080853345 cites W2221864351 @default.
- W3080853345 cites W2286210791 @default.
- W3080853345 cites W2315478346 @default.
- W3080853345 cites W2395686080 @default.
- W3080853345 cites W2400811867 @default.
- W3080853345 cites W2404622240 @default.
- W3080853345 cites W2413524769 @default.
- W3080853345 cites W2481716246 @default.
- W3080853345 cites W2491617924 @default.
- W3080853345 cites W2539054403 @default.
- W3080853345 cites W2541955701 @default.