摘要(英) |
This research is based on the “deep geological disposal” proposed by the Swedish Nuclear Fuel and Waste Management Company (SKB). On the basis of this concept, thermal, mechanical, thermo-mechanical, hydro-mechanical properties of the rock along with the layouts of the repository size and potential canister locations are analyzed. The following three topics are examined with the thermo-hydro-mechanical coupling analysis performed by the finite element software ABAQUS.
The first topic, The Influence of the Temperature Distribution in the Repository Far Field, focuses on the heat released by reason of radionuclide delay after canisters are deposited. The parallel verification of the heat transfer in the repository far field showed the temperature pulse reached the ground surface after about 300 years. Moreover, the maximum temperature increased between the two deposition areas and the central area was significantly lower (around 5-10°C) than it was directly through the deposition area (about 25°C). In addition, it occurred much later (about 1,000 years later) compared to it did directly through the deposition area (around 100 years later). These trends are consistent with the previous literature.
Following the results of temperature field analysis from Topic 1, the next topic is The Influence of Thermally-Induced Stresses in Repository Far Field and Heave of the Ground Surface. In line with past studies, the results showed the maximum stresses were found directly through the deposition area.
The final topic is The Influence of Shear Displacement and Hydraulic Transmissivity in Repository Far Field, continuing thermally-induced stress study from Topic 2.The analysis includes the shear displacement and hydraulic transmissivity. Based on the maximum shear displacement calculated under the same fracture radius, fractures perpendicular to the scanlines of the deposition areas were more stable. Furthermore, the hydraulic transmissivity increased as the normal stress decreased. Therefore, the maximum potential unstable fractures appeared in the deposition areas non-perpendicular to fractures. |
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