| 研究生: |
莊竣傑 chuang, Chun-chieh |
|---|---|
| 論文名稱: |
地工合成物之水庫淤泥脫水實驗與分析 Experiments and Analyses on the behavior of Geosynthetic Dewatering System against Reservior Sediments |
| 指導教授: |
黃景川
Huang, Ching-chuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 114 |
| 中文關鍵詞: | 脫水試驗 、水庫淤泥 |
| 外文關鍵詞: | reservior sediments, dewatering system |
| 相關次數: | 點閱:107 下載:1 |
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水庫清淤目前最大的問題在於大量之水庫淤泥無處堆置,地工沙腸
管(袋)工法是能使淤泥再生利用的方法之一,所以模擬地工沙腸管脫水行為進行脫水行為的觀察,使更了解現地沙腸管工法脫水機制,並觀察影響此行為的變數(地工合成材、土樣、懸浮液濃度與懸浮液初始高度),並討論上述變數對脫水行為的關聯性,使更了解這綠色環保工法,讓地球能永續發展。
此研究針對兩種織布與兩種不織布,利用變水頭脫水試驗儀器進行
白河水庫淤泥土樣與石門水庫淤泥土樣之懸浮液淤泥並改變懸浮液濃度與初始高度進行脫水實驗,此實驗探討透水率、流量、Filter cake 物理性質與上述條件之關係,並提出流量上下界預測理論。
此研究成果以下列三點簡介:
1. 顆粒愈粗的土樣(白河)初期系統透水率偏大;顆粒較細的土樣(石門)初期透水率偏小。顆粒排出比與地工合成物透水率大小呈正比趨勢。因此地工合成物種類對初期四分鐘內顆粒排出量、與水排
出量影響甚鉅,而四分鐘之後就完全由土樣種類來控制。初始懸浮液高度的不同與初期系統透水率關係呈反比趨勢。懸浮液濃度
與整體系統透水率呈現正比的趨勢。
2. 對於不同地工合成材、土樣、懸浮液濃度與懸浮液初始高度條件
下,將所形成的Filter cake 進行基本物理分析,發現Filter cake
孔隙比會隨著Filter cake 厚度而減少,將孔隙比與Filter cake有效應力關係圖來分析,結果得知壓縮指數 (Cc) 為0.37 至1.1之間,底部孔隙比(e)介於0.8 至1.7 之間,其中白河淤泥與織布Cc=0.66、白河淤泥與不織布Cc=0.55、石門淤泥與不織布Cc=0.53、石門淤泥與織布當σ’≦0.44 KN/m2 時Cc=0.37、當σ’>0.44 KN/m2 時Cc=1.1,接近低塑性正常壓密中等靈敏性黏土的性質。
3. 由孔隙比(e)與Filter cake 高度(Hs)關係圖能有效的預測出理論高度。而D6 與D10 能對Filter cake 穩定時間訂出合理的時間預測。而通常在時間小於100 分鐘內,預測的流率與流量通常都低估,是由於在土壤透水率(Ψsoil)與Filter cake 高度(Hs)在H0﹤100mm 情況下,簡化分析為一水平線,所以預測值在此區間會趨於較為保守。
A theoretical model for predicting effluent ratios (qt) and total effluents (Qt)in geosynthetic dewatering systems is established based on a series of falling head dewatering column tests using a silt-water mixture and four types of woven geotextiles reported by Huang and Luo (2007). Key elements of this model include :
(1) Permeability of the geotextile dewatering system is dictated by the hydraulic properties of soil cake deposited at the upstream of the geotextile,the influence of original permeability of the geotextiles to the permeability of geotextile dewatering systems is relatively small.
(2) Permittivity of the soil cake decreases non-linearly with the increase of the height of soil cake.
(3) The time for attaining final soil cake heights can be determined based on the descending of the particles, D6 and D10, to the level of final cake heights calculated based on the total volume of the suspended particles and the void ratio vs. cake heights relationship obtained in the tests. It is found that the experimental values of qt and Qt fell between the lower and upper bounds calculated using the proposed model for a major part of the test condition examined. For the test using a relatively small initial water height, Ho (=100 mm), the proposed model provided satisfactory values of qt, while provided under-estimated values of Qt due partially to the assumption on the permeability of the soil cake at early stage of cake formation, and also due partially to the relatively large error associated with the test with a relatively small initial water height.
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