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Structural Analysis of Slit Dam with Varied Slit Width
|關鍵字:||slit dam with varied slit width;開口變化梳子壩;debris flow;slit dam;土石流;梳子壩||出版社:||水土保持學系||摘要:||
The channel structures for retaining debris flow can be categorized as permeable dam and impermeable dam. Usually, slit dam (permeable dam) is more efficient than the check dam (impermeable dam). Despite of their advantages, slit dams are often blockaded by boulder. In this study, slit dam with varied slit width, i.e., slits of different heights, was proposed to achieve the safe and economical objectives.
To ensure the stability of slit dam with varied slit width, four different conditions with two different heights were analyzed in this study: (1) filled dam with normal flow under maximum earthquake, (2) filled dam with maximum flow, (3) empty dam impacted by debris flow, and (4) nearly filled dam striken by giant boulder at the top of dam. For illustrative purpose, an 8 meters high slit dam with varied slit width under condition (4) was designed to illuminate the mechanics analysis, thickness of the dam at different elevation, and the reguired amounts of steel bar. Finally, this study indicates that slit dam with varied slit width can achieve the safety objective with lower cost than traditional slit dam does.
針對開口變化梳子壩應在面臨河道中不同狀況下壩體均能保持安定，本文提出了四種狀況來分析壩體之穩定性，分別為case 1 淤滿+普通流量+設計最大地震、case 2 淤滿+設計最大洪水、case 3 空壩+土石流平均推擊、case 4 近淤滿+巨石撞擊，並在每種情況又分不同高度來分析。同時舉一8m高之開口變化梳子壩面臨case 4 情況為例，將其力學分析、壩體各部份厚度檢算及鋼筋配置計算方法詳列而出，以期作為一設計之參考。最後在實際計算其所需經費時指出開口變化梳子壩比梳子壩在面臨同樣情形下，能達到節省經費之目的。
|Appears in Collections:||水土保持學系|
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