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題名 | 顆粒結構受振盪之分選探討=The Size Separation by Vibrated of Granular in Debris Flow |
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作者 | 曾森煌; 劉治平; |
期刊 | 建國學報 |
出版日期 | 19970600 |
卷期 | 16 1997.06[民86.06] |
頁次 | 頁455-461 |
分類號 | 434.273 |
語文 | chi |
關鍵詞 | 碰撞; 顆粒; 土石流; Collision; Particle; Debris flow; |
中文摘要 | 有關土石流研究,在災害調查、發生與堆積機制、預警系統和防治對策工事等研究方面,已有相當之成果。雖然從事流動之力學特性和沖淤模式等研究也有不少的文獻發表,然而因為土石流內部材料組成的多樣性,和流動性質的多變性之故,尚不足於明瞭土石流流動力學特性的內涵。 有鑑於土石流內部包含有氣體、液體和不等比例的固體顆粒之混合流動,且個別組成成分之流動各有不同的特性。流變性質與濃度、固體顆粒間結構的鬆緊以及碰撞效應有很大的關係,尤其顆粒碰撞的行為扮演相當重要的角色。氣體和液體流動相關研究甚多,而流體內顆粒碰撞流動性質有待進一步探討。 本文注重在顆粒間接觸碰撞效應之探討,先採用三維圓顆粒堆積物經垂直震盪,來模擬土石流流體內顆粒粗顆粒上浮之對流分選現象。實驗結果與knight et al(1993)有關振盪誘導顆粒狀堆積物中粒徑較大的顆粒往上升,形成粒徑篩選的實驗結果比對符合外,更發現粗顆粒上升高度對總振盪強度之關係是一個拋物線方程式。可為進一步探討土石流流動力學特性之參考。 |
英文摘要 | Dbris flow studies in Taiwan reveals that significant results have been obtained in investigation of disasters, occurrence machanism, deposition, forecasts, and mitigating works. Although, there are papers on dynamic property, and simulation models. However, many aspects related to the machanism of flowing are still unknown. More effects should be concentrated on building a complete theory for debris flow. The collision effects of particles' collision play an important role on rheology of debris flow. This paper show that a verticle vibration will cause larger particles raising to the top of the heap. A polynomial equation has been gotten to decribe `the relations about the raising height and total vibration number. It is useful on the studies of rheology in debris flow. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。