臺灣博碩士論文加值系統

本研究以新店砂作液化阻抗及最大剪力模數之探討，而試驗方法為動力三軸配合彎曲元件試驗。其中試驗控制的變因為前期反復荷重與細粒料含量。
研究結果顯示，隨著前期反復荷重的增加，試體之液化阻抗亦會增大，但若超過一臨界的前期反復荷重後，試體之液化阻抗則會開始降低。而此臨界前期反復荷重的門檻值隨不同細粒料含量而變動。
在本研究中，試體經前期反復荷重作用後，剪力波速並未有明顯的變化，主要是隨相對密度之不同而有所改變，顯示本研究所採用之前期反復荷重對試體之擾動，並未達到改變試體剪力波速之程度。

This research investigates the liquefaction resistance and the maximum shear modulus of Hsin-Dian sand by using cyclic triaxial tests together with bender element tests. The factors to be studied include previous cyclic loading and fines content.
Test results show that liquefaction resistance generally would increase with increasing previous cyclic loading up to a critical value, and then it would start decreasing with further increase of previous cyclic loading. The critical value of previous cyclic loading would change with different fines content.
In this research, the shear wave velocities of the samples presheared by cyclic loading did not change obviously. The shear wave velocity is influenced mostly by relative density. It indicates that the level of disturbance due to previous cyclic loading is not high enough to have obvious effect on the shear wave velocity.

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
表目錄 VIII
圖目錄 IX
照片目錄 XVI
第一章 緒論 1
1.1前言 1
1.2研究動機 1
1.3研究方法 2
1.4論文內容 2
第二章 文獻回顧 4
2.1液化之定義及機制 4
2.2影響液化阻抗之因素 7
2.2.1相對密度對液化阻抗之影響 7
2.2.2初始應力狀態 8
2.2.3排水條件 9
2.2.4土壤特性 9
2.2.5細粒料含量及細粒料的塑性指數 10
2.2.6前期預剪對液化阻抗之影響 11
2.3影響土壤最大剪力模數之因素 12
2.3.1平均有效圍壓對最大剪力模數之影響 12
2.3.2孔隙比對最大剪力模數之影響 14
2.3.3細粒料對最大剪力模數之影響 15
2.3.4剪力模數與液化阻抗之關係 16
2.4現地試驗液化評估法 17
2.4.1 SPT法 17
2.4.2剪力波速法 20
2.5土壤最大剪力模數的量測方法 22
2.5.1彎曲元件構造 22
2.5.2彎曲元件試驗之原理 23
2.5.3彎曲元件試驗之發展過程 24
2.5.4剪力波有效傳遞距離 25
2.5.5剪力波到達時間之判定法則 25
2.6飽和砂土受剪之相位轉換狀態 26
第三章 試驗計畫 49
3.1試驗土樣介紹 49
3.2試驗計畫 49
3.3試驗儀器及設備介紹 50
3.3.1動力三軸試驗儀 50
3.3.2彎曲元件儀器 51
3.4試體準備方法 52
3.5試驗步驟 53
3.6試驗條件 55
3.7試體之應力與應變 55
3.7.1應力 55
3.7.2應變 57
第四章 試驗結果與討論 67
4.1前期反復荷重下孔隙水壓之變化 68
4.2液化阻抗之探討 69
4.2.1未受前期反復荷重試體之液化阻抗(探討細粒料差異) 69
4.2.2受前期反復荷重試體之液化阻抗 70
4.2.3前期反復荷重下剪應變與孔隙水壓變化 72
4.3剪力波速之探討 74
4.3.1未受前期反復荷重試體之剪力波速 74
4.3.2受前期反復荷重試體之剪力波速 75
4.4剪力波速與液化阻抗之關係 77
4.5不同前期反復荷重下之應力路徑 79
4.5.1施加不同前期反復荷重後之應力路徑 79
4.5.2相位轉換線之探討 80
第五章 結論與建議 119
5.1結論 119
5.2建議 121
參 考 文 獻 122
附錄 129

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