研究生: |
陳駿瑜 Chun-Yu Chen |
---|---|
論文名稱: |
考慮地下水位之砂質邊坡快速評估方法與安全性分析 Rapid Assessment Method and Analysis of Safety for Sandy Slopes with Considering Groundwater Level |
指導教授: |
李咸亨
Hsien-Heng Lee |
口試委員: |
陳堯中
Yao-Chung Chen 陳志南 Chee-Nan Chen 蔡光榮 Kuang-Jung Tsai 周南山 Nan-Shan Chou |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 166 |
中文關鍵詞: | 地下水位 、安全係數 、邊坡監測指標 、坡趾水平位移 |
外文關鍵詞: | groundwater level, safety factor, slope monitoring indices, horizontal displacement of slope toe |
相關次數: | 點閱:349 下載:4 |
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邊坡內部地下水位之變化是影響邊坡穩定安全的重要因素,也是邊坡監測的主要參數之一。但是,地下水位與邊坡安全係數之關係,以及其對於邊坡變形之影響,卻鮮少被詳細檢討。現有各種監測儀器管理值大多僅以經驗值代表邊坡潛在危險性,只能概略判斷此時邊坡是否可能在滑動,並且未明確指出對應之安全係數和變位大小。
本研究採用FLAC程式中的莫耳庫侖塑性模式,撰寫分析邊坡土壤之應力∼應變關係程式,另以Darcy定律撰寫另一個穩態滲流水之地下水位面(亦稱為自由水位面)分析程式。然後,以該水位面為準,分別進行STABLE6分析以及另一個以FISH程式語言所撰寫的邊坡內部水平位移量分析,以探討砂質邊坡內部地下水位對於整體穩定性之影響。
本研究成果獲知:各種內摩擦角不同的砂質邊坡隨著地下水位升高時,安全性逐漸減少,且在達到臨界地下水位後,安全性陡降。此成果亦可以正規化參數 與 表達之。因此,本文進一步建立一個合理且可快速使用於砂質邊坡的邊坡安全評估圖表,也可用於缺乏詳細土壤性質資料的現地邊坡之快速安全評估,解決盲從檢測之虞。
The variation of the groundwater level in a slope is the major influence factor for the slope safety. It is also a key parameter used for monitoring a slope stability problem. However, the relationship between the groundwater level and the slope safety is seldom investigated. So, does the displacements of a slope in unstable condition. Most indices used for the slope stability monitoring are based upon experience and are only related to the dangerous potential. They never point out the values of safety factor and displacement corresponding to the slope movement.
The stress-strain relationship of slopes in this study is analyzed by using the “Mohr-coulomb Plasticity Model” defined in the program FLAC. Darcy’s Law is also employed to write another program to analyze the ground water surface inside a slope, which is also named as phreatic surface. This phreatic surface is then used in both slope stability analysis (by using STABLE6) and displacements evaluation (written by using a FISH language) in order to obtain the influence of the groundwater level on the stability of the sandy slopes.
The results in this study show that the safety factor of slopes decrease as the groundwater level increase in different internal friction angles of sandy slope. And the safety factors of all kinds sandy slopes drop down rapidly once the critical water level is approached. This relationship could be presented by normalized parameters of FS/tan and Hw/H, as well. Therefore, rapid assessment charts for evaluating the stability of sandy slopes were established in this study which can also be applied to most in situ slopes with unknown soil properties.
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