A Study of Boundary Conditions in Three Dimensional Seismic Analysis of Tunnel using Finite Element Method

• Main Authors: Wei-Ting Lin, 林威廷
• Other Authors: Chihsen T. Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/50024904241459589139

碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 101 === Nuclear electrical power has been a part of the power supply of Taipower Company in Taiwan. As the high-level radioactive waste has been produced during the generation of nuclear electrical power and endangering the human environment for a long period with its long half-life property, all the advanced countries using nuclear energy has widely accepted the Deep Geological Disposal method as the optimum one to permanently dispose the high-level radioactive waste after long-term research and discussion. In this research, the basic concept of the underground disposal site of Swedish KBS-3V was employed. The seismic measurements during the Japanese 311 earthquake, measured by HAGA which is one of 800 stations installed by National Ressarch Institute for Earth Science and Disaster Prevention, has been utilized as the geological conditions in Taiwan is quite similar to the ones in Japan. The numerical software, SAP90, was employed in the seismic analysis conducted in this research. The contents are composed of (1) the comparison of stress analyses using Eigen and Ritz methods, (2) the influence of stress distribution with various damping ratios and damping coefficients, and (3) the discussion of sensitivity analysis over the data obtained from the previous two studies. The analytical results found the following conclusions. The energy dissipation and damping effect became obvious if the damping coefficients increased when the disposal site was under earthquake. Only small change of the stresses in the whole disposal site was found for various damping ratio as the nonlinear damper were originally assumed for the selection of damping coefficients.