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研究生: 蘇淶鈞
Lai-Chun Su
論文名稱: 近期應力歷史效應對台北黏土應力-應變特徵之影響
Recent Stress History Effect on Stress-Strain Characteristics of Taipei Clay
指導教授: 鄧福宸
Fu-Chen Teng
口試委員: 林宏達
Horn-Da Lin
葛宇甯
Louis Ge
學位類別: 碩士
Master
系所名稱: 工程學院 - 營建工程系
Department of Civil and Construction Engineering
論文出版年: 2019
畢業學年度: 107
語文別: 中文
論文頁數: 137
中文關鍵詞: 近期應力歷史效應台北黏土應力-應變特徵
外文關鍵詞: Recent Stress History, Taipei Clay, Stress-Strain Characteristics
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應力歷史效應討論著重於應力路徑方向旋轉角的改變,本研究納入「近期」、「歷史事件」綜合考量,使用台北粉土質黏土為試驗材料,並以Reconstituted Sample方式製作試體,設計五組操作變因為事件與事件間的應力路徑長度(Length of Stress Path,LSP)之三軸應力控制壓密不排水試驗(SPCU Test),探討近期應力歷史對台北黏土之應力-應變行為影響。
試驗結果顯示,土壤破壞特徵與初始勁度不受試驗設定影響,然而不同應力歷史下之勁度劣化趨勢相異,歸納出LSP對於兩次應力路徑方向旋轉角之間有交互作用,使得試驗組之間擁有相同的旋轉角,卻有不同的勁度表現,本研究認為除了應力路徑方向旋轉角度之外,LSP及多次的旋轉角度也應納入近期應力歷史。


The recent stress history effect has a significant effect on the stress-strain characteristics under small strain range. Previous research on recent stress history effect focuses only on the change of rotation angle in the direction of stress path. In addition to the rotation angle, the period and historical events have been consider in this study to define the recent stress history. Reconstituted sample of Taipei silty clay was used in this research. Triaxial stress control consolidation undrained test (SPCU test) was perform on five identical samples with different length of stress path (LSP) to investigate the influence of recent stress history on stress-strain behavior of Taipei silty clay.
The test results of the samples show similar strength and initial stiffness except the stiffness deterioration which shows different degrees of degradation. Therefore, it can be conclude that LSP influence the stress-strain behavior indirectly by the rotation angles of two stress paths, which explain the fact that the test have the same rotation angle for the samples, but different stiffness degradation performance. In addition to the rotation angle of stress path, the recent stress history should also consider LSP and multiple rotation angles.

論文摘要 I Abstract III 誌謝 V 目錄 VII 表目錄 XI 圖目錄 XII 第一章 緒論 1 1.1 研究動機與目的 1 1.2 研究內容 2 1.3 研究流程 2 第二章 文獻回顧 5 2.1 近期應力歷史(Recent Stress-History) 5 2.2 試驗用試體 9 2.3 殘餘有效應力(Residual Effective Stress,σ'r) 11 2.4 受剪速率 13 2.5 土壤參數正規化 14 2.6 試驗數據校正 16 2.6.1 快速傅立葉轉換(Fast Fourier Transform) 16 2.6.2 移動平均法(Moving Average) 18 第三章 設備儀器與試驗方法 35 3.1 試驗計劃 35 3.2 土樣來源及試體製作 36 3.2.1 土樣來源及整備 36 3.2.2 Reconstituted Sample 37 3.2.3 試體品質 41 3.3 全自動三軸儀器設備 42 3.3.1 軸向加壓系統 42 3.3.2 水壓力控制系統 43 3.3.3 監測系統 43 3.3.4 電腦端自動控制 45 3.3.5 其他配件 45 3.4 試驗方法及內容 48 3.4.1 基本物理性質試驗 48 3.4.2 三軸應力路徑控制壓密不排水受剪試驗(Stress Path Control Consolidated Undrained Triaxial Test) 48 3.5 三軸試驗應力路徑規劃 52 第四章 試驗結果 77 4.1 基本物理性質試驗 77 4.2 Reconstituted Sample 78 4.2.1 Reconstituted Sample步驟確立 78 4.2.2 均一性 78 4.3 數據校正 80 4.3.1 快速傅立葉轉換(Fast Fourier Transform,FFT) 80 4.3.2 移動平均法(Moving Average) 81 4.3.3 校正結果 82 4.4 土壤相關參數定義與選定 83 4.5 三軸應力路徑控制壓密不排水受剪試驗(SPCU)結果 89 4.4.1 應力路徑 89 4.4.2 SPCU試驗結果 90 第五章 結果討論與分析 115 5.1 土壤強度討論 115 5.1.1 應力歷史變因 115 5.1.2 土壤破壞特徵與應力歷史變因之關係 116 5.2 土壤勁度討論 119 5.2.1 楊氏模數正規化 119 5.2.2 剪力模數正規化 119 5.2.3 勁度劣化模式 119 第六章 結論與建議 129 6.1 結論 129 6.1.1 土壤破壞特徵與應力路徑之關係 129 6.1.2 勁度劣化 129 6.1.3 分析應用 129 6.2 建議 131 6.2.1 應力路徑規劃 131 6.2.2 試驗數據佐證、發展 131 參考文獻 133 附錄 139

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