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論文中文名稱:濕吸力平衡路徑與水入滲對非飽和紅土之影響 [以論文名稱查詢館藏系統]
論文英文名稱:Effects of wetting-path suction equalization and water-infiltration on the shear strength of unsaturated lateritic soil [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:工程學院
系所名稱:土木與防災研究所
畢業學年度:99
出版年度:100
中文姓名:吳永銘
英文姓名:Yung-ming Wu
研究生學號:97428028
學位類別:碩士
語文別:中文
口試日期:2011-07-22
論文頁數:254
指導教授中文名:魏敏樺
口試委員中文名:盧之偉;吳博凱
中文關鍵詞:非飽和土壤剪入滲應力水平水體積應變基質吸力
英文關鍵詞:unsaturated soilshear infiltrationStress levelwater volumetric strainmatric suction
論文中文摘要:在台灣,林口台地主要為風化碎石和卵礫石所組成的紅土,紅土土壤是殘積土的一種,主要分佈於深層地下水位面之上方,使得大部分紅土土壤之飽和度的降低,而形成非飽和的狀態。當土壤非飽和的時候,土壤的張力與吸力將會使土壤顆粒之間拉的更緊密,並且提升土壤剪力強度來維持紅土邊坡的穩定。然而在降雨期間,水入滲到土壤中使得土壤水分含量增加,而造成土壤中的吸力降低,迫使原本緊密的土壤顆粒變鬆散狀態,以導致土壤剪力強度開始減少,因此土壤邊坡可能會沿著潛在的破壞面引發山崩,故研判紅土邊坡的崩塌與破壞通常主降雨入滲有很大的關係。
為了更瞭解紅土區域的邊坡因降雨造成淺層破壞機制,本研究於林口台地取原狀土壤回實驗室進行一系列三軸壓縮詴驗,包括常吸力剪切詴驗與剪入滲詴驗(shear-infiltration test)。剪入滲詴驗的結果將會與常吸力剪切詴驗中獲得的剪應力和破壞包絡面進行比較與探討,並制定剪入滲行為的基本破壞機制,以及發展出剪入滲破壞行為下的強度破壞包絡面。另一方面在剪入滲詴驗中,量測獲得的水體積應變與孔隙水壓力,將採用Meilani al et. (2005)體積變化之理論來進行分析結果,以提供往後能夠模擬降雨入滲對紅土邊坡不穩定之預測方法。
論文英文摘要:Linkou plateau mainly weathered rock and gravel composed of clay in the Taiwan, mainly in the deep water table above the surface, making the most of the clay soil of the degree of the saturation of the reduce, the formation of unsaturated state. When unsaturated soil, the suction and tension of the soil will cause between the soil particles pull more closely, and improve clay soil shear strength to maintain slope stability. However, during rainfall, water infiltration into the soil makes increased moisture content of the soil, resulting in reduced suction of the soil, and to tight structure of the soil particles become loose structure, leading to shear strength of the soil started to decrease. Therefore, may be along the potential failure surface caused by landslides in the soil slope.
This study was to take undisturbed soil of the Linkou plateau do series of triaxial compression tests in the laboratory, including constant suction shear tests and shear infiltration tests. Infiltration test results will be with constant suction shear tests to obtain the shear stress and failure envelope with compared, and develop the basic behavior of failure mechanism of shear infiltration, and the development of the shear strength failure envelope under shear infiltration. The other hand, measurement of water volume strain and pore water pressure on the shear infiltration tests, will by Meilani al et. (2005) use to volume change theory analysis to explore, to provide future to simulate the rainfall infiltration instability prediction for the residual soil slope.
論文目次:目 錄
誌 謝 ............................................................................................................................... i
中文摘要 .......................................................................................................................... ii
英文摘要 ......................................................................................................................... iii
目 錄 ............................................................................................................................. iv
表目錄 ............................................................................................................................ vii
圖目錄 .............................................................................................................................. x
第一章 緒論 .................................................................................................................. 1
1.1 研究動機與目的 ............................................................................................... 1
1.2 研究方法與內容 ............................................................................................... 2
1.3 論文架構與分章概述 ....................................................................................... 3
第二章 文獻回顧 .......................................................................................................... 6
2.1 概述 ................................................................................................................... 6
2.2非飽和土壤之特性及理論 ................................................................................ 7
2.2.1非飽和土壤的性質 ................................................................................. 7
2.2.2土壤的吸力特性及理論 ......................................................................... 9
2.2.3 土壤水分特性曲線 .............................................................................. 15
2.2.4非飽和土壤之應力狀態 ....................................................................... 21
2.2.5非飽和土壤之剪力強度 ....................................................................... 23
2.3非飽和土壤之三軸詴驗 .................................................................................. 25
2.3.1壓密排水詴驗(CD) ............................................................................... 26
2.3.2常含水量詴驗(CW) .............................................................................. 28
2.3.3壓密不排水詴驗(CU) ........................................................................... 30
2.4非飽和土壤之臨界狀態力學 .......................................................................... 31
2.4.1基本的假設 ........................................................................................... 32
2.4.2臨界狀態理論的基本概念 ................................................................... 32
2.4.3臨界狀態的強度與變形特性 ............................................................... 38
2.4.3.1臨界狀態下壓密排水三軸詴驗的特性 .................................... 40
2.4.3.2臨界狀態下壓密不排水三軸詴驗的特性 ................................ 46
第三章 非飽和剪入滲三軸詴驗步驟 .......................................................................... 52
3.1介紹 .................................................................................................................. 52
3.2前人學者之研究 .............................................................................................. 54
3.2.1 Melinda et al.(2004)研究 ................................................................. 54
3.2.2 Wong et al. (2001)研究 .......................................................................... 59
3.2.3 Meilani et al.(2005)研究 .................................................................. 65
3.2.4學者研究之整合 ................................................................................... 66
3.3修改三軸儀器系統 .......................................................................................... 68
3.3.1自動化伺服控制系統 ........................................................................... 68
3.3.2孔隙水壓力計與量測系統 ................................................................... 71
3.3.3詴驗儀器之校正 ................................................................................... 75
v
3.4本研究詴驗方法與步驟 .................................................................................. 77
3.4.1現地土樣之準備 ................................................................................... 77
3.4.2三軸詴驗之詴體安裝程序 ................................................................... 82
3.4.3常吸力(CD)詴驗 ................................................................................... 86
3.4.4剪入滲詴驗 ........................................................................................... 89
第四章 詴驗結果與討論 .............................................................................................. 92
4.1介紹 .................................................................................................................. 92
4.2紅土之物理特性 .............................................................................................. 92
4.2.1現地含水量詴驗 ................................................................................... 92
4.2.2比重詴驗 ............................................................................................... 93
4.2.3孔隙比詴驗 ........................................................................................... 93
4.2.4粒徑分佈詴驗 ....................................................................................... 95
4.2.5阿太堡限度詴驗 ................................................................................... 96
4.3單向度壓密詴驗結果 .................................................................................... 100
4.4現地基質吸力詴驗 ........................................................................................ 106
4.5壓力鍋詴驗與鹽溶液詴驗 ............................................................................ 110
4.6非飽和三軸詴驗之壓密曲線 ........................................................................ 117
4.7常吸力(CD)詴驗之結果 ................................................................................ 128
4.8剪入滲詴驗之結果 ........................................................................................ 152
第五章 剪入滲之整合分析與探討 ............................................................................ 174
5.1介紹 ................................................................................................................ 174
5.2紅土破壞包絡面之多元線性迴歸分析 ........................................................ 175
5.2.1 紅土破壞包絡線之分析結果 ............................................................ 178
5.2.2 紅土的延伸破壞包絡面之分析結果 ................................................ 180
5.2.3 紅土的延伸破壞包絡面與剪入滲之比較結果 ................................ 182
5.3剪入滲之體積變化理論分析 ........................................................................ 194
5.3.1 理論介紹 ............................................................................................ 194
5.3.2 體積變化理論與詴驗結果之比較 .................................................... 196
第六章 結論與建議 .................................................................................................... 208
6.1 結論 ............................................................................................................... 208
6.2 建議 ............................................................................................................... 210
參考文獻 ...................................................................................................................... 210
附錄 A. 土壤基本物理詴驗 ....................................................................................... 214
A. 土壤基本物理詴驗 ......................................................................................... 215
A.1含水量詴驗 (Water Content Test) ........................................................ 215
A.2阿太堡限度詴驗 (Atterberg Limit Test) .............................................. 215
A.3粒徑分佈詴驗 (Grain-Size Distribution Test) ...................................... 217
A.4比重詴驗 (Specific Gravity Test) ......................................................... 218
A.5夯實詴驗 (Compaction Test) ................................................................ 219
A.6 單向度壓密詴驗 (Consolidation Test) ................................................ 220
A.6.1預壓密應力、壓縮曲線、再壓曲線之圖解步驟 ..................... 221
A.7 收縮詴驗 (Shrinkage Test) .................................................................. 222
附錄 B. 土壤水分特性曲線詴驗 ............................................................................... 223
B. 土壤水分特性曲線詴驗 ................................................................................. 224
vi
B.1壓力鍋詴驗 (Pressure Plate Extractor Test) ......................................... 224
B.2鹽溶液詴驗 (Salt Solution Test) .......................................................... 227
附錄 C. 粒徑分佈詴驗之結果 ................................................................................... 229
附錄 D. 土壤水分特性曲線詴驗之結果 ................................................................... 239
符號彙編 ...................................................................................................................... 249
作者簡介 ...................................................................................................................... 254
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論文全文使用權限:同意授權於2014-08-22起公開