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題 名 | 應用分離元素法及連續體力學法分析流槽中砂土的流動與堆積=Application of the Discrete Element Method and Continuum Mechanics Method on the Flow and Deposition of Sands in a Flume Test |
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作 者 | 張光宗; 江志文; | 書刊名 | 水土保持學報 |
卷 期 | 44:3 2012.09[民101.09] |
頁 次 | 頁251-266 |
分類號 | 441.103 |
關鍵詞 | 大型流槽; 堆積; PFC2D; FLO-2D; Flume test; Runout; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用分離元素法PFC2D 及連續體力學法FLO-2D 模擬真實大型流槽試驗,其中二 者共同參數分別給予適當設定,如顆粒密度決定土石比重、孔隙率決定體積濃度,其餘參數透 過PB 設計篩選出影響堆積行為的重要因子,得知在PFC2D 影響量體堆積範圍最主要的參數是 顆粒勁度、顆粒摩擦係數及阻尼比,在FLO-2D 為降伏應力及黏滯係數,再依序決定出參數設 定的先後順序及各參數的合理值,使數值模型的堆積狀態能夠驗證真實大型流槽結果。之後將 PFC2D 及FLO-2D 模擬出相似堆積狀態的參數組合成一筆資料,持續搜尋有相似堆積結果的參 數,即有多筆資料,將24 筆資料利用統計軟體R 進行典型相關分析,得到典型相關係數0.8922, 且其P 值為5.29e-6 小於0.05,達到統計上的顯著水準,證明二者之間有高相關存在,最後再 進行多變數迴歸分析建立PFC2D 與FLO-2D 參數間的關係式。 |
英文摘要 | The Discrete Element Model PFC2D and Continuum Mechanics Model FLO-2D are used to simulate the real large flume test. The parameters which both PFC2D and FLO-2D have the same type are set as follows: specific gravity and volume concentration are determined by particle density and void ratio, respectively. The PB design is used to study the relative influence of the parameters onthe deposition behavior. For PFC2D, the important parameters are particle stiffness, particle friction and viscous damping, while for FLO-2D, they are yield stress and viscosity. Next, we determine the procedure of parameters’ setting and reasonable parameter values to make numerical deposit results verify the real flume result. Finally, the parameters of both PFC2D and FLO-2D that yield similar deposition behavior are collected for canonical correlation analysis through statistical software R. A canonical correlation coefficient 0.8922 is obtained. Its P-value is 5.29e-6, which is less than 0.05. It shows that the parameters of both models have high correlation with each other. After that, the relationships between the parameters of both PFC2D and FLO-2D for sandy material are established by multivariate regression analysis. |
本系統中英文摘要資訊取自各篇刊載內容。