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題 名 | 混合孔隙材料影響遲滯現象之砂箱試驗與入滲之數值模擬=Influence of Mixed Porous Material to Hysteresis by Sand Box Test and Numerical Modeling of Infiltration |
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作 者 | 柯凱元; 簡翊哲; 陳主惠; 譚義績; | 書刊名 | 農業工程學報 |
卷 期 | 51:2 民94.06 |
頁 次 | 頁62-74 |
分類號 | 434.222 |
關鍵詞 | 砂箱實驗; 遲滯現象; 入滲; Sand box test; Hysteresis; Infiltration; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究目的是藉由不同配比混合粗粒料孔隙材料(以生態環保磚材料為例)及細粒料孔隙材料(以石英砂為例),探討遲滯現象受到粗、細混合配比孔隙材料之影響,並利用數值分析了解各種配比下之入滲曲線變化情況。 研究中結合(1)試驗孔隙材料基本性質實驗(2)遲滯現象砂箱實驗(3)遲滯模式模擬及研究方法。試驗材料基本性質實驗包含生態環保磚及石英砂之乾比重量測、定水頭量測水力傳導係數、篩分析及殘餘含水比試驗。遲滯現象砂箱實驗則以自行設計之砂箱,配合土壤水份感測(TDR)及張力計(tensionrmeter)同時量測含水比及張力值,以繪出完整之保水曲線(water retention curve)。遲滯模式模擬則以王銘燦(2002)發展之有限差分模式,藉以了解不同配比下孔隙材料之入滲行為變化。 研究結果顯示,不同配比之粗粒料與細粒料之透水性、保水曲線可藉由試驗室中進行試驗以求得,且不同配比下之粗粒料與細粒料所產生之遲滯現象,會隨著細粒料佔整體孔隙材料之比例越高而越明顯。另在考慮遲滯現象影響下以程式模擬不同配比孔隙材料內部水分變化情形,可模擬入滲時之混合孔隙材料賽部水份移動,結果顯示,孔隙率較高之孔隙材料(或是飽和水力傳導係數較高),其水份入滲速度在未飽和狀態下不一定較快,而需視當時含水比大小所計算而得之未飽和水力傳導係數而定。 |
英文摘要 | The research is to mix coarse material (using Ecological Environmental Protection Brick material) with fine material (using quartz sand) in different ratio to analyze the hysteresis influenced by mixed porous material. A numerical model will be used to understand the change of infiltration curve under different mixed conditions. This research combines basic property experiments for the test porous material, the hysteresis sand box test, and hysteresis numerical model. Basic property experiments of the test porous material include measuring specific gravity, saturated hydraulic conductivity, residual water content and sieve analysis. Hysteresis sand box test used a designed sand box with TDR and tensionmeter measuring water content and tension in the mixed porous material relatively, to characterize the water retention curve and to find the related parameter. We adopted a hysteresis FDM model developed by Wang (2002) to simulate the infiltration of water in different mixed porous material. Results shows the hydraulic conductivity and water retention curve of different mixed porous material can be obtained by our sand box test. The higher ratio of the fine material in mixed porous material, the hysteresis would be more obvious. The hysteresis model developed by Wang (2002) can also describe the water movement in the mixed porous material. The results show higher porosity (or higher saturated hydraulic conductivity) does not necessarily result in higher infiltration velocity under unsaturated condition. The unsaturated infiltration velocity depends on the unsaturated hydraulic conductivity calculated from the water content. |
本系統中英文摘要資訊取自各篇刊載內容。