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Comparative Simulation Study on THM‐induced Changes in Hydrological Properties of Fractured Rock near Nuclear Waste Repositories
This paper presents results from an international multiple‐team simulation study on thermally induced changes in hydraulic rock mass properties around underground nuclear waste emplacement drifts. The study considered repository settings with backfilled emplacement drifts in deep saturated rocks as well as open emplacement drifts in shallower unsaturated rocks. The simulation results showed that the dominant mechanism of changes in hydraulic properties were closure (reduced aperture) of vertical fractures as a results of increased horizontal stress, whereas the potential for shear induced permeability changes were small. For such mechanism, the prediction of maximum permeability changes could be effectively bounded by the values of the residual aperture and permeability at high compressive stress. For such a bounding prediction of permeability changes, we found that the impact on the flow field was relatively small with most changes occurring in the vicinity of the emplacement drifts. We conclude that the most challenging and uncertain part of this type of analysis is to estimate the potential for and significance of shear induced changes in fractured rock permeability, which critically depends on the initial stress field and fracture characteristics at respective repository setting.
Comparative Simulation Study on THM‐induced Changes in Hydrological Properties of Fractured Rock near Nuclear Waste Repositories
This paper presents results from an international multiple‐team simulation study on thermally induced changes in hydraulic rock mass properties around underground nuclear waste emplacement drifts. The study considered repository settings with backfilled emplacement drifts in deep saturated rocks as well as open emplacement drifts in shallower unsaturated rocks. The simulation results showed that the dominant mechanism of changes in hydraulic properties were closure (reduced aperture) of vertical fractures as a results of increased horizontal stress, whereas the potential for shear induced permeability changes were small. For such mechanism, the prediction of maximum permeability changes could be effectively bounded by the values of the residual aperture and permeability at high compressive stress. For such a bounding prediction of permeability changes, we found that the impact on the flow field was relatively small with most changes occurring in the vicinity of the emplacement drifts. We conclude that the most challenging and uncertain part of this type of analysis is to estimate the potential for and significance of shear induced changes in fractured rock permeability, which critically depends on the initial stress field and fracture characteristics at respective repository setting.
Comparative Simulation Study on THM‐induced Changes in Hydrological Properties of Fractured Rock near Nuclear Waste Repositories
Shao, Jian‐Fu (editor) / Burlion, Nicolas (editor) / Rutqvist, J. (author) / Barr, D. (author) / Birkholzer, J. T. (author) / Fujisaki, K. (author) / Kolditz, O. (author) / Liu, Quan‐Sheng (author) / Fujita, T. (author) / Wang, Wenqing (author)
2013-02-19
10 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Conference Proceedings | 2004
Rock mechanics for siting radioactive waste repositories in hard rock
| British Library Conference Proceedings | 1999
Coupled processes associated with nuclear waste repositories
Elsevier | 1987