Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34128
DC FieldValueLanguage
dc.contributor.advisor段錦浩zh_TW
dc.contributor.author陳虹合zh_TW
dc.date2002zh_TW
dc.date.accessioned2014-06-06T07:47:13Z-
dc.date.available2014-06-06T07:47:13Z-
dc.identifier.urihttp://hdl.handle.net/11455/34128-
dc.description.abstract為解決一般透過性壩體所遭遇之最大問題,也就是容易受土石流巨大衝擊力而損壞及壩體上游貯砂空間不足,因而考慮設置平面篩分裝置。此平面篩分裝置由兩座相距很近的防砂壩上面再架設平行於流心線而有間隙的數十根H型鋼所組成,具有一般透過性壩體之特性,可調節土砂流出量,且沿著土石流流向設置,以避免土石流直接衝擊,並將貯砂場所移至下游,可有較大之貯砂空間。此裝置並針對分離後土石與水可能有再度混合形成土石流之缺點加以改良,創設主流及分流河道,使分離之較大礫石由主流河道至預計沉積處,分離出之細顆粒土砂及水從分流河道引導至下游原河道或安全地區排放。 本試驗之目的主要藉調整平面篩分裝置之設置坡度,了解在不同的設置坡度下,對土石流流動之停止及沉積有何影響。所得之結果有以下幾點: 1.土石流流況受平面篩分裝置作用,產生流動、停積、再流動、再停積之重覆現象,最後停止流動。 2.預計沉積處及平面篩分裝置上堆積之土砂,其粒徑分布呈現由下至上粒徑漸小之情形。 3.由試驗得知,平面篩分裝置之設置坡度在22度~24度時較為經濟,分離效果亦佳。zh_TW
dc.description.abstractThe dam body is damaged by the huge impaction from the debris flow and the sand-trapping capacity is not enough are the two challenges to the open dam. Therefore, this plain screening device has studied. This device composes of two dams with small spacing. Many structure steels I-beam are mounted on the two dams with designed spacing. The I-beam is parallel to the water flow. This device has the properties as the general open dam. This device can adjust the outflow of the debris and avoid the direct impaction from the debris flow. And some sand-trapping capacity can shift to the downstream. The device can form main channel and by-pass. The coarse cobble can move above the I-beam screen and deposit in the main channel downstream of the device. The fine particle and water of the debris flow will drop through the I-beam screen and flow through the by-pass to the downstream. The purpose of this experiment is to analyze the effect on stop and deposit of debris flow by adjusting the slope of the plain screening device. The results of this experiment are described as follows: 1.Due to the debris flow affected by the plain screening device, there is a repeated phenomenon of move and stop of the debris flow. And, at last, it stops. 2.The vertical distribution of the grain size shows that the higher the elevation the smaller the particle size. 3.From the experiment, we know that this device is economical and has better effect in separation for coarse cobble and fine particle when the slope is between 22˚ to 24˚.en_US
dc.description.tableofcontents一、 前言 1 1.1土石流的特性 1 1.2土石流的防災措施 2 1.3研究動機 3 二、 前人研究 6 2.1土石流的特性 6 2.1.1土石流的流動性態 6 2.1.2土石流的發生形態 7 2.1.3土石流的各段坡度 8 2.1.4土石流的泥砂體積濃度推估 9 2.2土石流之防治工法 10 2.2.1土石流防治工法之效能評估 10 2.2.2透過性防砂壩的特點 10 2.2.3透過性防砂壩的開口經驗式 12 2.3透水柵之相關研究 14 三、 材料與方法 18 3.1試驗條件 19 3.2試驗裝置 20 3.3試驗步驟 21 四、 結果與討論 26 4.1實驗現象之描述 26 4.1.1土砂運移現象 26 4.1.2土石堆積形態 28 4.2實驗結果之分析 29 五、 結論與建議 37 5.1結論 37 5.2建議 39 六、 參考文獻 41 表目錄 表2-1 土石流與溪床傾斜角之關係 9 表3-1 粒徑分布表 19 表3-2 試驗條件 20 表4-1 平面篩分裝置試驗資料表 36 圖目錄 圖1-1 土石流防治工法之範例 5 圖1-2 壩體型式示意圖 5 圖2-1 土石流流動性狀示意圖 7 圖2-2 土石流發生形態示意圖 8 圖2-3 土石流通過透過性防砂壩之土砂流動變化 12 圖2-4 日本燒岳透水柵施工完成 15 圖2-5 日本燒岳透水柵經土石流後淤滿情形 15 圖3-1 粒徑分布圖 19 圖3-2 實驗流程圖 22 圖3-3 渠槽試驗之正視圖 23 圖3-4 渠槽試驗之側視圖 23 圖3-5 平面篩分裝置之正視圖 24 圖3-6 平面篩分裝置之側視圖 24 圖3-7 鋼棒配置圖 24 圖4-1 分離後土砂重量分布圖 32 圖4-2 分離後土砂重量百分比對壩高圖 32 圖4-3 分離後土砂百分比對坡度圖 32 圖4-4 堆積坡度變化圖 33 照片 照片3-1 平面篩分裝置 25 照片4-1 坡度低時,土石流先端部脫水狀況 33 照片4-2 土石流未發生時之狀況 34 照片4-3 土石流即將發生之狀況 34 照片4-4 土石流之分離狀況 35 照片4-5 鋼棒上方之土砂堆積情形 35zh_TW
dc.language.isoen_USzh_TW
dc.publisher水土保持學系zh_TW
dc.subject土石流zh_TW
dc.subject平面篩分裝置zh_TW
dc.titleAn experiment on the debris flow plain screeningen_US
dc.title土石流平面篩分之試驗zh_TW
dc.typeThesis and Dissertationzh_TW
Appears in Collections:水土保持學系
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