Numerical Analysis of Seismic Motion for An Earth Dam

• Main Authors: Spike Wu, 吳俊賢
• Other Authors: James Ni
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/80061095630915535023

碩士 === 國立臺北科技大學 === 土木與防災技術研究所 === 90 === Chi-chi(集集) earthquake and Chiayi(嘉義) earthquake created various damage to those dams in that region. Fortunately, there is no earth dam within these two areas suffered severe damage in these events, although one concrete dam was severely damaged. But, how can we know an earth dam will, or will not, fail in the next earthquake? By using the result of geotechnical engineering centrifuge model testing and numerical analysis method, we can find a way to evaluate the safety of earth dam and the possible failure. When the earthquake is happening, the pore water pressure in the earth dam will sensibly react. Although the displacement monitoring system can also show the slope slide, but it is not as sensible as the pore water pressure and may not provide enough time to react. The pore water pressure is good easily warning signal of the earth dam failure. By establishing the alert and action values of the pore water pressure for earth dam failure, the management agency can adopt the necessary emergency measures. Numerical analysis method is necessary to analyze the safety of an earth dam in the earthquake. There are so many finite element analysis programs in the world, and it is questionable to assure which program can effectively predict the earth dam failure and provide the alert value and action value. In this study, we collect the centrifugal earth dam testing results and lab soil testing results from VELACS program in U.S.A., and the LIQCA code is used to analyze the same earth dam in VELACS program, and the numerical analysis results are compared with the centrifuge model testing results. Therefore, we will understand the capability of LIQCA code to analyze the safety of an earth dam under earthquake shaking, and explore the possibility to evaluate the signal of earth dam failure by using centrifuge modeling and numerical analysis.