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研究生:王雅琪
研究生(外文):Ya-ChiWang
論文名稱:非飽和土壤中應力狀態參數對剪力波速影響之探討
論文名稱(外文):Effects of Stress State Variables on Shear Wave Velocity for Unsaturated Soils
指導教授:張文忠張文忠引用關係
指導教授(外文):Wen-Jong Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:土木工程學系碩博士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:83
中文關鍵詞:非飽和土壤應力狀態參數剪力波速應力軸平移
外文關鍵詞:unsaturated soilstress state parametershear wave velocityaxis translate technique
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土壤力學特性受有效應力狀態參數影響,非飽和土壤之有效應力較飽和土壤複雜,常用兩個獨立之應力狀態參數基質吸力與淨正向應力來描述非飽和土壤之有效應力行為。本研究以傳統三軸試驗設備加入總體積量測設備、波速量測設備以及高進氣陶瓷,並以應力軸平移方式控制基質吸力,探討不同應力狀態參數對非飽和土壤剪力波速之影響。由實驗結果發展理論公式並求出係數,係數分別為淨正向應力與基質吸力之指數,指數代入理論公式便可求得剪力波速、淨正向應力與基質吸力之關係,實驗結論可得其淨正向應力指數皆大於基質吸力指數,表示淨正向應力對非飽和土壤剪力波速之影響程度大於基質吸力,且淨正向應力之指數則與平均粒徑(D50)成反比。
Mechanical properties of soils are significantly affected by effective stress states. For unsaturated soils, the effective stresses are more complex than saturated soils and generally characterized by two independent effective stress parameters termed as net normal stress and matric suction. In this study, bender elements are integrated in an unsaturated triaxial cell to investigate the effects of stress state on shear wave velocity of unsaturated soil. Axis translate technique is implemented to control matric suction and total volume measurement device is used to confirm the balance of unsaturated state.Exponential correlation that relates the shear wave velocity with the net normal stress and matric suction are proposed. Testing data are used to find the exponential index of the correlations for different soil types. Testing results reveal that the exponential index of the net normal stress is greater than the exponential index of the matric suction, indicating that the net normal stress has more significant effects on shear wave velocity. Comparisons among different soil types reveal that the exponential index of the net normal stress is inverse proportion to the mean grain size of the soil.
摘要 I
Abstract II
致謝 III
目錄 IV
表目錄 VIII
圖目錄 IX
第一章 緒論 1
1.1研究背景與動機 1
1.2研究方法與流程 2
1.3論文架構 4
第二章 文獻回顧 5
2.1非飽和土壤性質 5
2.1.1土壤之組成 5
2.1.2應力狀態參數 5
2.1.3非飽和土壤之基質吸力 7
2.1.4應力軸平移 10
2.1.5土壤含水量特徵曲線 11
2.2土壤剪力波速 13
2.2.1剪力模數與基質吸力之關係 13
2.2.2影響剪力模數之因子 16
2.2.3 彎曲元件 17
2.3基質吸力之量測 20
2.3.1高進氣陶瓷 20
2.3.2基質吸力量測方法 21
第三章 試驗儀器設備 24
3.1 試驗儀器 24
3.1.1非飽和三軸室 24
3.1.2 試體總體積量測系統 29
3.1.3量測剪力波速之設備 34
3.1.4迷你型電子張力計 37
3.1.5 壓力控制系統 40
3.1.6壓力板試驗 41
3.1.7濕度飽和氣壓製作 44
3.2儀器率定 45
3.2.1 差壓計之率定 45
3.2.2 迷你型電子張力計之率定 46
第四章 試驗內容 47
4.1試驗原理 47
4.1.1非飽合平衡狀態之達成 47
4.1.2剪力波速之量測 47
4.1.3基質吸力之穩定 48
4.1.4試體裝設 48
4.1.5試驗控制條件 50
4.2試驗步驟 51
4.3試體土壤 53
4.3.1試體土壤之物理性質 53
4.3.2試體製作 55
4.4資料處理 57
4.5 試驗規劃 58
第五章 試驗結果與分析 61
5.1 試驗結果 61
5.1.1剪力波速試驗結果 61
5.1.2迷你型電子張力計結果 64
5.1.3剪力波速與應力狀態參數在空間中之關係 66
5.1.4 壓力板試驗結果 67
5.2試驗結果與理論公式之比較 69
5.2.1基質吸力與剪力波速之關係 69
5.2.2淨正向應力與剪力波速之關係 71
5.2.3 理論公式 72
第六章 結論與建議 78
6.1結論 78
6.2建議 79
參考文獻 80

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