Numerical study of scale effect on fluid flow through a rough fracture
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A4 Artikkeli konferenssijulkaisussa
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Date
2024-09-17
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en
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6
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New Challenges in Rock Mechanics and Rock Engineering - Proceedings of the ISRM Rock Mechanics Symposium, EUROCK 2024
Abstract
Scale effect on fluid flow and rock joint roughness remains uncertain. Using photogrammetry, the topography of a fracture surface was replicated. A 3D model was reconstructed for a 2 m × 1 m granite sample, extracting a 1 m × 1 m subsample. This model was duplicated and shifted a 350-micrometer along the Z-axis. To study scale effect, different samplesizes ranging from 5 cm × 5 cm to 100 cm × 100 cm were used for roughness analysis and fluid flow simulations in COMSOL Multiphysics. The pressure gradients ranged from 20 to 100 kPa/m, with intervals of 20 kPa/m. As the sample sizes increased, the roughness approached a Joint Roughness Coefficient (JRC) of 10, with no significant change observed beyond approximately30 cm in sample size. Fluid flow simulations showed a nonlinear relationship between pressure gradients and flow rates, following For chheimer equation. Notably, beyond 30 cm sample size, the hydraulic aperture and non-Darcy coefficient reached a relatively stable state.Description
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Torkan, M, Janiszewski, M, Uotinen, L, Rinne, M & Baghbanan, A 2024, Numerical study of scale effect on fluid flow through a rough fracture . in R Tomás, M Cano, A Riquelme, J L Pastor, D Benavente & S Ordóñez (eds), New Challenges in Rock Mechanics and Rock Engineering - Proceedings of the ISRM Rock Mechanics Symposium, EUROCK 2024 . New Challenges in Rock Mechanics and Rock Engineering - Proceedings of the ISRM Rock Mechanics Symposium, EUROCK 2024, CRC Press, pp. 500-505, ISRM European Rock Mechanics Symposium, Alicante, Spain, 15/07/2024 . https://doi.org/10.1201/9781003429234-72