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研究生: 溫郁菁
Wan, Yu-Ching
論文名稱: 以位移法分析自然邊坡在地震力作用下的曲面形破壞
The Displacement Of Rotational Failure Of The Natural Slopes Under Seismic Condition
指導教授: 陳時祖
Chen, Shih-Hsu
學位類別: 碩士
Master
系所名稱: 工學院 - 資源工程學系
Department of Resources Engineering
論文出版年: 2003
畢業學年度: 91
語文別: 中文
論文頁數: 134
中文關鍵詞: 對數螺旋形破壞擬靜力地震折減係數圓弧形破壞累積位移量位移係數
外文關鍵詞: Cumulative displacement, Pseudostatic earthquake reduction coefficient, displacement coefficient, log spiral failure, circular failure
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  • 對自然邊坡而言,地震造成的邊坡破壞以累積位移量評估其穩定性較傳統的擬靜力法求安全係數方式評估來得合理,因為這種方法是利用實際地震的加速度資料以Newmark分析法觀念進行重積分求累積位移量,除了可考慮到最大加速度值、震動時間域內它的震動特性的影響外,還可以位移量的大小給予邊坡量化的受損程度。
    本研究主要以Newmark位移法探討自然邊坡在地震作用力下的曲面形破壞。首先探討求累積位移量時圓弧形滑動的臨界加速度與位移係數相關特性並與對數螺旋形破壞及平面形破壞模式比較,此處所謂的位移係數乃指位移量公式中會隨滑動面形狀而改變的係數,位移量之大小是此係數與水平方向位移量的乘積。最後再將此係數與臨界加速度配合一般計算水平方向累積位移量經驗公式併用,以建立圓弧形滑動位移量計算流程。
    分析結果發現,臨界加速度部分,圓弧形破壞與對數螺旋形計算結果一樣,故曲面形破壞下的臨界加速度都會相等,在不考慮凝聚力時,曲面形破壞又與平面形破壞臨界加速度十分接近,故在分析不同破壞型態下的位移量時,都可以位移係數考量即可。而在位移係數部分,分析曲面形破壞時,位移係數與邊坡傾角、摩擦角成反比與穩定數成正比。位移係數結果還可配合水平方向折減係數評估,即可估計圓弧形累積位移量相對的擬靜力地震折減係數。最後製作圓弧形滑動時臨界加速度與位移係數相關圖表,可配合已發表之水平方向經驗公式,即可求圓弧形滑動的累積位移量。

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    目 錄 摘要........................................Ⅰ 誌謝........................................Ⅱ 目錄........................................Ⅲ 表目錄......................................Ⅵ 圖目錄......................................Ⅶ 符號表......................................ⅩⅠ 第一章 緒論 1-1研究背景與動機...........................1 1-2研究目的.................................2 1-3研究流程.................................3 第二章 文獻回顧 2-1擬靜力分析...............................6 2-2Newmark分析理論..........................11 2-3臨界加速度...............................13 2-3-1平面形破壞.............................14 2-3-2曲面形破壞.............................17 2-4累積位移量公式...........................28 2-4-1平面形破壞.............................28 2-4-2曲面形破壞.............................30 2-4-3累積位移量經驗公式.....................39 2-5垂直加速度的影響.........................49 2-6擬靜力地震係數的設計.....................52 第三章 理論模式 3-1基本假設.................................55 3-2臨界加速度...............................56 3-3Newmark位移法圓弧形滑動剛體位移模式......56 3-4位移係數.................................59 3-5分析方法.................................62 3-5-1分析程式...............................62 3-5-2臨界加速度.............................64 3-5-3位移係數...............................65 3-5-4位移法結果推算擬靜力地震加速度建議值...65 3-5-5案例驗證...............................66 第四章 臨界加速度與位移係數研究成果 4-1參數設定.................................68 4-2臨界加速度與邊坡傾角關係.................70 4-2-1曲面形破壞.............................71 4-2-2平面形破壞.............................76 4-2-3曲面形與平面形臨界加速度比較...........81 4-3位移係數與邊坡傾角關係...................86 4-3-1曲面形位移係數.........................86 4-3-2平面形位移係數.........................95 4-4凝聚力為零的特殊狀況.....................97 4-4-1臨界加速度.............................97 4-4-2位移係數...............................99 4-5擬靜力地震加速度設計....................102 4-6 結論...................................103 第五章 案例分析 5-1案例邊坡介紹............................105 5-2案例邊坡地形地質及地震資料概況..........106 5-3水平方向累積位移量......................113 5-4累積位移量..............................117 5-5累積位移量設計建議流程..................119 5-6結論....................................122 第六章 結論與建議 6-1結論....................................123 6-2建議....................................125 參考文獻...................................126

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