| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 101 === The electrical power has been obtained from a variety of methods since it was utilized by human beings. The nuclear energy was even included in recent years. However, the radioactive waste was produced during the generation of nuclear energy. The most widely accepted safest disposal method of the waste in the world is the Deep Geologic Disposal method.
This research employed the FLAC3D（Fast Lagrangian Analysis of Continua in 3 Dimensions）software, originally developed by ITASCA in 1977 using finite element method, to conducted the mechanical analysis of the intersection between main tunnel and deposition hole located in the disposal site. The mechanical property of rocks was assumed to be perfectly elasto-plastic and the failure criterion Mohr-Coulomb was adopted. A series of sensitivity analysis was conducted with RMR and K values. Finally, the development of plastic zone with various RMR and K values was investigated when the concrete lining was installed in the main tunnel.
The numerical results obtained in this research can be concluded as follows. When the K values increased, the displacements in the main tunnel along the Y direction and the disturbance at the corner of deposition holes became obvious. In other words, stress concentration and damage always occurs at the location. During the excavation process, the shear plastic damage happened in main tunnel and tensile plastic damage existed in the rocks of deposition holes.
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