| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 106 === For the use of radioactive energy, it is important to develop techniques for the disposal of radioactive wastes in the world. The deep geological repository is currently recognized as a feasible disposal concept. The deep repository is host rock at a depth of 300 m to 1,000 m, and the canisters are surrounded by buffers. The deposition holes would be drilled in bed rock and set up with canisters and buffers. These make the canister not easily affected by natural operation, humanity activities and tectonic movement with high stability. As it needs a quite long time for storage, the long-term safety needs to be examined and regulated with design premises. All the design premises must to be fulfill to ensure that the barrier functions works and then reach the long-term safety of deposition. Therefore, engineering properties of buffer material under high confining pressure plays the important role.
In order to realize the engineering properties of buffer material, use laboratory tests to simulate the situations of in-situ repository. The experient was divided into two parts for this research. Considering different states of buffer marerial, used different bulk densities, water contents and confining pressures to simulate the mechanical characteristic by unconsolidated-undrained triaxial test. And used one-dimensional consolidation test to simulate the settlement by canister and pressures. This study uses triaxial test and consolidation test to simulate the confining pressure from low to high confining pressure. Using this method to analyze mechanical parameters of buffer material and estimate deformation for long times.
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