透過您的圖書館登入
IP:54.205.238.173
  • 學位論文

織布護岸承受雙向循環水流作用下之沖蝕行為研究

The Erosion Behavior Of Revetments Using Woven Geotextiles Under Cyclic Flow

指導教授 : 何嘉浚

摘要


地工合成材的種類繁多,其功能亦大相逕庭,其中地工織物由於具有孔隙大、質料輕且耐用之特性,因此常被使用於河海堤岸用以保護土壤,避免遭水流沖蝕破壞。其穩定機制係利用地工織物與周圍之土壤互制形成土壤-地工織物過濾系統,一旦此一系統形成,便可有效保護護岸土壤,避免產生沖蝕破壞。 目前相關的研究大多採用單向水流的試驗,然而一般河岸的水利條件較接近雙向循環水流,因此,本研究擬針對雙向水流作用於土壤-地工織物過濾系統時所造成的沖蝕行為。本研究主要試驗材料包括現地河岸沖積土壤及地工織布,並且利用自行研發之雙向循環水流試驗儀,以不同週期之循環水流作用於土壤-地工織布過濾系統,以模擬現地之水流作用行為。實驗土壤分別採用細粒料含量1%之新店溪沖積土壤及含23%左右細粒料之大漢溪沖積土樣;地工織布則分別採用三種厚度及開孔徑均不相同之聚丙烯材質織布。 在同一織布實驗結果顯示,細粒料含量多之大漢溪土樣所產生之水壓力變化較劇烈,且在短週期之循環水流作用下,因細顆粒易隨著水流移動而伴隨產生較大的沉陷變化,由此可知短週期循環水流對於土壤-地工織布過濾系統之穩定性影響較大,且細粒料含量多之土樣較不易形成穩定之過濾系統。

並列摘要


There are many types of geosynthetics with the different function. Geotextiles is one of them often used to protect the river bank erosion due to its porosity, light weight and durability. Using geotextiles with site soil will from a soil-geotextile filtration system to protect the river bank and prevent erosion. A great amount of research has been conducted for geotextile filters under uni-directional flow condition. Previous studies are quite rare for the river bank under bi-directional flow condition. Therefore, a series of tests will be performed in this study in order to understand the erosion mechanism of soil-geotextiles filtration system under cyclic flows. Self-developed equipment will be used for erosion test. Two alluvial soils with 1% and 23% of respective fine particle content are composed of three woven geotextiles with different opening and thickness are adopted to perform the test under four different cyclic flows, respectively. According to the test results, the soil sample with higher fine particle content will trigger dramatic change in water pressure use the same geotextile. In addition, fine particle will migrate easily under short cyclic flow and induce large settlement. Finally, it is not easy to form a stable filtration system for the soil sample with high fine particle content.

參考文獻


[2] 王國海 (2001),「反向水流對地工織物抗阻塞潛能影響之研究」,碩士論文,私立中原大學土木工程學研究所。
[12] 劉家豪 (2011),「以雙向水流探討五種地工織物之過濾行為」,碩士論文,國立台灣大學土木工程學研究所。
[16] 鍾文彬 (2007),「地工織物在雙向水流下之過濾表現與試驗後之微觀」,碩士論文,國立台灣大學土木工程學研究所。
[14] 謝啓萬 (1999),「地工合成材料常用檢測法簡介」,地工技術雜誌,第71期,第13-28頁。
[10] 莊竣傑 (2007),「地工合成物之水庫淤泥脫水實驗與分析」,碩士論文,國立成功大學土木工程學研究所。

延伸閱讀