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研究生(外文):Wen-Tao Chang
論文名稱(外文):A Study of Matric Suction on the Stability of Linkou Terrace Lateritic Soil Slope
指導教授(外文):Meen-Wah Gui
外文關鍵詞:unsaturated soilslope stabilitySWCCmatric suction
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Due to fast develop of economics in Taiwan, the quality of live is enhanced, and demand value that natural environments and resources are used is also increased. The area of plain in Taiwan is about 26%, and it is not enough used. So the builder only develops the rest that is mountainside about 74%. But in these conditions that the characters of mountainside are not understand enough, and the knowledge of precaution against natural calamities is not enough, the mountainside generates destructions such as sliding, collapsing, and debrisflow et. In these cases, due to the unique location of ground water table in the slope, soils between the slope surface and ground water table are in unsaturated state. It’s called unsaturated soil . During long raining season, heavy rainfall intensity will inevitably force the shear strength of these soils to depreciate and subsequently cause the slope to fail. Conventional slope stability analyses are normally carried out for saturated soil condition; they failed to consider the engineering characteristics such as matric suction of unsaturated soil in the stability problem.
Soil mechanics for unsaturated soils is a newer technique. In Taiwan, this research is not many, but it’s importance is discovered. Therefore, in this research, test apparatuses of unsaturated soil are set up first, and research the procedures of soil-water characteristic test. Then, the soil-water characteristic curves of lateritic soil in Taiwan are found, and discuss the matric suction, high and low plastic, and void ratio of influences on soil-water characteristic curve. At last, numerical analysis uses PCSTABL5 program, and analyzes the heights and degrees of slope, and depths and degrees of groundwater of influence on stability of global slope. I hope that the result in this research can be applied design of engineering in lateritic soil terraces, and engineer can use to reference.
摘 要 i
誌謝 v
目錄 vii
表目錄 xi
圖目錄 xiii
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
第二章 文獻回顧 5
2.1 前言 5
2.2 紅土的定義與成因 8
2.3 紅土的基本性質 8
2.3.1 紅土的化學性質 8
2.3.2 紅土的物理性質 9
2.3.3 游離氧化鐵 14
2.4 紅土的工程性質 15
2.4.1 紅土的工作度 15
2.4.2 紅土的回脹性 15
2.4.3 紅土的剪力強度 16
2.4.4 紅土的滲透性 25
2.4.5 紅土的孔隙比 26
第三章 試驗原理、設備與步驟 27
3.1 前言 27
3.2 現地取樣 29
3.3 一般物理性質試驗 29
3.3.1 含水量試驗 29
3.3.2 比重試驗 29
3.3.3 粒徑分析試驗 30
3.3.4 阿太堡限度試驗 31
3.4 水份特性試驗 33
3.4.1 土壤的吸力理論 33
3.4.2 土壤的水份特性 34 水份特性曲線之定義 35 水份特性曲線與土壤剪力強度之關係 37
3.4.3 水份特性試驗 42 高進氣吸力值陶瓷板與壓力鍋 42 鹽溶液法(salt solution method) 46 濾紙法(filter paper method) 46
3.4.4 水份特性試驗步驟及結果 51 壓力鍋試驗(pressure plate test) 51 鹽溶液試驗(salt solution method) 56 濾紙法試驗(filter paper test) 60
3.5 飽和三軸壓密不排水試驗 62
3.5.1 飽和三軸試驗儀器設備 62
3.5.2 飽和三軸試驗步驟 67
3.5.3 飽和三軸試驗結果 67
3.6 小結 72
第四章 非飽和土壤邊坡案例分析 75
4.1 前言 75
4.2 坍滑區基本資料概述 76
4.2.1 坍滑區之歷史 76
4.2.2 坍滑區之地形與地質 77
4.2.3 坍滑區之水文與氣候 78
4.3 非飽和土壤邊坡穩定性分析 79
4.3.1 雨水的入滲行為 80
4.3.2 非飽和土壤邊坡穩定性分析 82 非飽和土壤邊坡穩定分析之基本原理 82 非飽和土壤邊坡穩定分析模式之建立 83
4.3.3 PC-STABL5程式之介紹 85 PC-STABL5程式概述 85 PC-STABL5程式運算方式 86 參數輸入的限制及注意事項 88
4.3.4 分析剖面及參數之求取 92
4.3.5 分析結果與討論 99
4.4 小結 106
第五章 非飽和土壤邊坡參數分析 107
5.1 前言 107
5.2 林口台地之概述 107
5.2.1 林口台地之地形與地質 107
5.2.2 林口台地之氣候 108
5.2.3 林口地區山坡地概況 108
5.3 非飽和土壤邊坡穩定分析模式之建立 110
5.4 分析參數的求取 113
5.5 分析結果與討論 115
5.6 小結 145
第六章 結論與建議 147
6.1 結論 147
6.2 建議 148
參考文獻 149
符號說明 157
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