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頁籤選單縮合
題 名 | 防砂壩下滲流截流管抑制管湧之研究 |
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作 者 | 蘇重光; 卓文鵬; | 書刊名 | 逢甲學報 |
卷 期 | 24 1991.11[民80.11] |
頁 次 | 頁361-374 |
分類號 | 443.92 |
關鍵詞 | 抑制; 防砂壩; 截流管; 滲流; 管湧; |
語 文 | 中文(Chinese) |
中文摘要 | 無護坦防砂壩受衝擊射流之作用,壩下之沖刷坑一旦形成,勢必縮短壩基下之滲流 長度,可能導致管湧之發生,對於防砂壩之安全影響甚鉅。為了解在洪水來臨時,壩基下滲 流、湧管、沖刷三者之關係,本研究針對壩基前裝置截流管於有衝擊射流作用及無衝擊射流 作用兩種情況下,分別進行壩基下滲流之數值模擬。衝擊射流造成之沖刷坑邊界為本研究之 一特殊條件,本文利用定床空氣衝擊射流試驗,以界定沖刷坑之沿壁壓力分布。 經模擬衝擊射流作用下之壩基下滲流,發現在沖刷坑表層形成一劇烈之局部滲流,此局 部滲流產生之滲流力可視為造成沖刷坑沖刷之主要動力。 |
英文摘要 | Once the scour hole below a check dam without an apron has been formed owing to the impinging jet of the nappe, the seepage length underneath the dam is shortened and piping may thus occur. This will jeopardize the safety of the dam in general. To better understand the relations among the seepage flow, piping and scouring during a flood event, this study is focused on the numerical simulation of the seepage beneath the dam with an intercepting drain under the impinging of the nappe. Also investigated is the situation without any impinging jet. The boundary conditions pertinent to the impinging jet are unique ones, which are obtained by a fixed bed air flow model and essentially a pressure distribution on the surface of the scour hole. It has been also found that near the surface of the scour hole there is a localized seepage flow, which is believed to be the major force causing the enlargement of the scour hole. |
本系統中英文摘要資訊取自各篇刊載內容。