研究生: |
吳俊緯 Chun-wei Wu |
---|---|
論文名稱: |
地下水位對砂質邊坡之連續性破壞研究 The Influence of Groundwater Levels on The Progressive Failure in Sandy Slopes |
指導教授: |
李咸亨
Hsien-Heng Lee |
口試委員: |
周南山
Nan-shan Chou 陳堯中 Yao-Chung Chen |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 185 |
中文關鍵詞: | 坡趾飽和度 、連續性破壞 |
外文關鍵詞: | Saturation of the slope toe, Progressive failure |
相關次數: | 點閱:190 下載:1 |
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本研究分為兩大部份:第一部份為利用Flac程式進行地下水位滲流分析,以0.5m為一單位調整地下水位高,分析至地下水位高於坡趾後,由前人所撰寫的程式碼讀取地下水位面位置,將其地下水位座標輸入至STABL程式中進行坡地安全係數的分析,探討地下水位的變化對砂質邊坡之影響。根據不同坡角及摩擦角做為數值模擬的變數,共有5種坡角、4種摩擦角及2種坡高,結果可得知當地下水位上升且高於坡趾時,其邊坡安全係數會急劇下降,導致邊坡發生出水高破壞弧。
第二部份:由於破壞弧與出水高位置接近且破壞面積極小,本研究將其初始破壞弧挖除後進行連續性破壞分析,發現當邊坡產生出水高破壞時便足以影響整體邊坡的穩定性進而破壞至坡頂,利用資料正規化後所呈現的曲線可分為三種趨勢。後續探討坡趾之有效應力、孔隙水壓、坡趾飽和度及側向位移量與邊坡破壞機制之關係,結果顯示各邊坡當坡趾飽和度達90%以上,安全係數即開始下降至1.0以下,屬破壞狀況。
There are two parts in this research: Part one is about seepage analysis of groundwater by FLAC program. This research sets 0.5m as a unit then increases the groundwater level. The analysis will be stopped when the groundwater level rises above the slope toe. The program codes are used to read the coordinate of groundwater, and then it is input to the STABL program to analyze factor of safety of sandy slope, in order to discuss the influence of groundwater levels in the slopes. Among many kinds of slope angles and friction angles to be the parameters for numerical analysis, there are five values for slope angles, four values for friction angles and two values for slope height that will be used in the analysis. The results can explain that the factor of safety of the slope will decrease suddenly and generate the failure surface when ground water rises above the slope toe.
Part two: Because the failure surface is very close to the position of slope toe, so this research try to cut the first failure surface then simulate the progressive failure analysis. Finally, the result can let us know that it’s enough to affect the overall stability of the slope when the first failure happened. And then the research also considers the relationship between the saturation of slope toe and slope failure. The results showed that when the saturation is over than 90%, the safety factor will decrease to 1.0. This behavior leads to unsafe condition.
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