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碩士論文公告區 |
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| 年度： | 93 | |
| 姓名： | 李俊男(Jun-Nan Li) | |
| 論文題目(中)： | 土石壩地震反應二維數值分析 | |
| 論文題目(英)： | Two-Dimensional Numerical Analyses of Earthquake Response of Earthdam | |
| 摘要(中)： | ||
| 本研究以有限差分法FLAC5.0程式進行鯉魚潭水庫土石壩受到集集地震作用之動態反應分析。鯉魚潭之壩高為96m。模擬鯉魚潭壩滾壓之築壩過程、土石壩滲流分析、滲流後之靜力平衡分析與最終之土石壩動態分析等一貫化分析。滲流分析係以集集地震來襲時的水位60m水位來分析。滲流分析後，再進行靜力平衡求起始應力。在鯉魚潭因為集集地震的垂直向震動明顯，故垂直向與水平向的加速度歷時均輸入至水壩底部進行50秒的動態分析。地震加速度在輸入前先將高於5Hz的頻率濾除。動態分析的土壤模式採用等值線性的FLAC內建模式(Sigmoidal 4)與莫爾-庫倫模式加上5%雷利式阻尼來指定。本研究數值分析結果很符合壩體的加速度與位移監測紀錄。壩頂與下游殼層的永久變形與測量資料之比較差異值均在合理範圍內。本研究再以鯉魚潭水壩受到集集地震分析結果為基準案例，針對土石壩之築壩材料進行動態反應影響參數分析，分析結果發現，影響大壩位移及加速度之主要影響因子包括剪力模數G、動態組成律、水位、阻尼與地震加速度輸入之方式。本分析發現，雙向加速度輸入方式比單水平加速度及單垂直加速度輸入方式佳。 | ||
| 摘要(英)： | ||
| This study used FLAC5.0 to analyze the dynamic response of Li-yu-tan earthdam subjected to the 1999 Chi-Chi earthquake (ML=7.3) in Taiwan. The dam is 96m high. Seepage analysis was performed considering a 60-meter water level which was the level while the earthquake struck. After the seepage analysis, the initial stress state of the dam before applying the earthquake was obtained by computation for static equilibrium. Because the up-down shaking of Chi Chi earthquake is notable, both the horizontal and up-down monitored acceleration time histories were input to the base of the dam for 50 seconds in the dynamic analyses. The frequencies of accelerations were filtered to be under 5 Hz before input. The FLAC built-in “Sigmoidal 4” linear equivalent dynamic model and Mohr-Coulomb soil model were simultaneously adopted with a 5% Rayleigh damping assignment. The numerical results are close to the acceleration/ displacement time histories monitored at the top of the dam. Permanent displacements at the top, upstream and downstream shells were also evaluated with the theodolite data. The comparisons are satisfied with reasonable ranges of differences. This research use the analysis results of Li-yu-tan Dam subjected to Chi-Chi earthquake as the baseline case for parametric study. It is found that the major factors influence the displacement and acceleration of dam including shear modulus G, constitutive model, water level, damping and the way applying earthquake acceleration. This study found that bi-axial (horizontal and vertical) input of acceleration is better than only single (horizontal) input of acceleration. | ||
| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0823105-040538 | |