The growth of faults and fracture networks in a mechanically evolving, mechanically stratified rock mass : a case study from Spireslack Surface Coal Mine, Scotland
Andrews, Billy James and Shipton, Zoe Kai and Lord, Richard and McKay, Lucy (2020) The growth of faults and fracture networks in a mechanically evolving, mechanically stratified rock mass : a case study from Spireslack Surface Coal Mine, Scotland. Solid Earth, 11 (6). pp. 2119-2140. ISSN 1869-9529 (https://doi.org/10.5194/se-11-2119-2020)
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Abstract
Fault architecture and fracture network evolution (and resulting bulk hydraulic properties) are highly dependent on the mechanical properties of the rocks at the time the structures developed. This paper investigates the role of mechanical layering and pre-existing structures on the evolution of strike–slip faults and fracture networks. Detailed mapping of exceptionally well exposed fluvial–deltaic lithologies at Spireslack Surface Coal Mine, Scotland, reveals two phases of faulting with an initial sinistral and later dextral sense of shear with ongoing pre-faulting, syn-faulting, and post-faulting joint sets. We find fault zone internal structure depends on whether the fault is self-juxtaposing or cuts multiple lithologies, the presence of shale layers that promote bed-rotation and fault-core lens formation, and the orientation of joints and coal cleats at the time of faulting. During ongoing deformation, cementation of fractures is concentrated where the fracture network is most connected. This leads to the counter-intuitive result that the highest-fracture-density part of the network often has the lowest open fracture connectivity. To evaluate the final bulk hydraulic properties of a deformed rock mass, it is crucial to appreciate the relative timing of deformation events, concurrent or subsequent cementation, and the interlinked effects on overall network connectivity.
ORCID iDs
Andrews, Billy James, Shipton, Zoe Kai ORCID: https://orcid.org/0000-0002-2268-7750, Lord, Richard ORCID: https://orcid.org/0000-0002-5737-5140 and McKay, Lucy;-
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Item type: Article ID code: 73991 Dates: DateEvent18 November 2020Published18 September 2020AcceptedSubjects: Science > Geology
Technology > Engineering (General). Civil engineering (General) > Environmental engineeringDepartment: Faculty of Engineering > Civil and Environmental Engineering
Strategic Research Themes > EnergyDepositing user: Pure Administrator Date deposited: 25 Sep 2020 13:21 Last modified: 04 Sep 2024 01:09 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/73991