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系統識別號 U0026-2707202014244400
論文名稱(中文) 以三維擬真地層模擬探討降雨入滲對邊坡穩定性影響之研究
論文名稱(英文) Influence of Rainfall Infiltration on Slope Stability with the 3D Realistic Stratigraphic Simulation
校院名稱 成功大學
系所名稱(中) 資源工程學系
系所名稱(英) Department of Resources Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 李怡萱
研究生(英文) Yi-Hsuan Lee
學號 N46071091
學位類別 碩士
語文別 中文
論文頁數 139頁
口試委員 指導教授-陳昭旭
口試委員-李德河
口試委員-林志平
口試委員-王承德
中文關鍵字 邊坡穩定  降雨入滲  GMS  FLAC3D 
英文關鍵字 slope stability  rainfall infiltration  GMS  FLAC3D 
學科別分類
中文摘要 本研究整合了GMS(Groundwater Modeling System)以及FLAC3D(Fast Lagrangian Analysis of Continua in 3 Dimensions)兩套數值軟體,以台南市六甲區的南勢坑地滑區作為研究區域。先利用GMS建立研究區域的三維地層模型以及水位面,透過MATLAB(MATrix LABoratory) 將GMS的檔案轉換成FLAC3D可讀取的格式,進行後續的四種水位與降雨入滲的邊坡穩定性模擬。本研究對前人建模的步驟有所精進,並選用不同的網格元素組合使模型層面更加平滑,也更接近現場情形。此外,本研究透過自行撰寫的FISH語言,將非飽和帶顯示在FLAC3D中。
四種水位的模擬結果顯示:高水位的安全係數小於1,而中高、中低以及低水位的安全係數皆大於1,其各別的位移量、剪應變量與潛在的滑動土方量隨著地下水位面下降逐漸降低。而降雨入滲的模擬結果則顯示出因入滲而形成的非飽和帶會使有效應力和剪力強度的下降,故邊坡發生破壞的程度較大。另外,本研究也利用降雨量與安全係數之間的關係得到本案例邊坡的臨界降雨量為641.9 mm。
英文摘要 This study integrates two sets of numerical software, GMS (Groundwater Modeling System) and FLAC3D (Fast Lagrangian Analysis of Continua in 3 Dimensions), with Nan-shi-keng landslide area in Tainan City as the study area. First,use GMS to create a three-dimensional stratum model and water table of the study area, and convert the GMS file into a FLAC3D readable format through MATLAB (MATrix LABoratory).Then conduct slope stability analysis. This study has refined the steps of predecessor modeling, and selected different combinations of grid elements to make the model’s plane smoother and closer to the site. In addition, this study displays the unsaturated zone in FLAC3D.
The simulation results show: (1) The amount of displacement, the amount of shear strain, and the potential sliding volume decrease as the groundwater table decreases, while the safety factor increases. (2) The unsaturated zone formed by infiltration will reduce the effective stress and shear strength, so the slope will be damaged to a greater extent. (3) Using the relationship between rainfall and safety factor, the critical rainfall of the slope in this case is 641.9 mm.
論文目次 摘 要 I
SUMMARY II
誌 謝 VII
目 錄 VIII
表目錄 XII
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 2
1.3 研究流程與架構 3
第二章 文獻回顧 5
2.1 邊坡破壞的類型 5
2.2 影響邊坡穩定的原因 8
2.3 邊坡穩定分析 10
2.3.1 邊坡穩定分析方法 10
2.3.1.1 變形性分析法(Deformation Analysis Method) 11
2.3.1.2 剪力強度折減法 13
2.3.2 邊坡破壞之判別 13
2.3.3 三維度邊坡穩定分析相關研究 14
2.4 不飽和土壤 16
2.4.1 不飽和土壤特性 16
2.4.2 不飽和土壤的力學行為 17
2.4.3 土壤-水分特性曲線 19
2.4.4 降雨入滲 24
2.5 研究區域介紹 28
2.5.1 地形與地質 28
2.5.2 相關文獻 30
2.5.3 潛在滑動塊體 32
2.5.4 相關監測數據 32
第三章 研究方法 38
3.1 GMS 40
3.1.1 TIN模組 40
3.1.2 Borehole模組 42
3.1.3 3D mesh模組 44
3.1.4 2D Scatter Point模組 45
3.2 FLAC3D 46
3.2.1 基本方程式 46
3.2.2 運算程序 49
3.2.3 本構模型 51
3.2.4 基本分析架構 52
3.2.5 實際分析步驟 53
3.2.6 水力耦合運算 55
3.2.7 非飽和降雨入滲 57
3.3 MATLAB轉換 61
第四章 地下水位面對邊坡穩定的影響 64
4.1 數值模型的建立 64
4.1.1 GMS 66
4.1.2 MATLAB轉換 69
4.1.3 FLAC3D 70
4.2 網格精緻化 72
4.3 驗證 74
4.3.1 案例一 75
4.3.2 案例二 78
4.4 數值分析結果與討論 83
4.4.1 安全係數 84
4.4.2 位移量 89
4.4.3 剪應變增量 94
4.4.4 塑性區 99
4.4.5 滑動潛勢 99
4.4.6 模型的上下限 104
第五章 降雨入滲對邊坡穩定的影響 107
5.1 降雨入滲的方法 107
5.2 驗證 110
5.3 數值分析結果與討論 116
5.3.1 安全係數與位移量 116
5.3.2 剪應變增量 120
5.3.3 孔隙水壓 124
5.3.4 模擬結果的比較 127
第六章 結論與建議 129
6.1 結論 129
6.2 建議 130
參考文獻 131
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