Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/38760
Title: Pore geometry as a control on rock strength
Authors: Bubeck, A.
Walker, R. J.
Healy, D.
Dobbs, M.
Holwell, D. A.
First Published: 21-Oct-2016
Publisher: Elsevier
Citation: Earth and Planetary Science Letters 457 (2017) 38–48
Abstract: The strength of rocks in the subsurface is critically important across the geosciences, with implications for fluid flow, mineralisation, seismicity, and the deep biosphere. Most studies of porous rock strength consider the scalar quantity of porosity, in which strength shows a broadly inverse relationship with total porosity, but pore shape is not explicitly defined. Here we use a combination of uniaxial compressive strength measurements of isotropic and anisotropic porous lava samples, and numerical modelling to consider the influence of pore shape on rock strength. Micro computed tomography (CT) shows that pores range from sub-spherical to elongate and flat ellipsoids. Samples that contain flat pores are weaker if compression is applied parallel to the short axis (i.e. across the minimum curvature), compared to compression applied parallel to the long axis (i.e. across the maximum curvature). Numerical models for elliptical pores show that compression applied across the minimum curvature results in relatively broad amplification of stress, compared to compression applied across the maximum curvature. Certain pore shapes may be relatively stable and remain open in the upper crust under a given remote stress field, while others are inherently weak. Quantifying the shape, orientations, and statistical distributions of pores is therefore a critical step in strength testing of rocks.
DOI Link: 10.1016/j.epsl.2016.09.050
ISSN: 1385-013X
Links: http://www.sciencedirect.com/science/article/pii/S0012821X16305301
http://hdl.handle.net/2381/38760
Embargo on file until: 21-Oct-2017
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/ Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Geology

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