含懸浮質流體於孔隙介質中阻塞現象之探討

Study on the Blocking Effect of Pores by Suspending Particles in the Fluid

陳瀅如(Ying-Ru Chen)

指導教授 ： 張德鑫

中原大學/工學院/土木工程研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200470

摘要

中文摘要

在壓力或重力作用下，流體可於孔隙介質中流動，工程上常利用介質之物理特性去除流體所攜帶之雜質或細顆粒，但介質會隨孔隙之逐漸阻塞而降低其過濾效率。本研究目的即在探討含懸浮顆粒流體對孔隙介質之阻塞現象，並依據介質與懸浮顆粒之不同粒徑分佈，探討被阻塞介質滲透係數隨時間變化量，以做為諸如人工湖補注、隔幕灌漿、水處理等工程之參考。
研究中以過濾理論配合實驗室砂箱實驗進行現象探討。首先以清水通過各種粒徑砂質濾層，探討介質孔隙率與滲透係數之關係式，然後以經驗式予以驗證。應用此關係式即可根據後續進行之各種過濾試驗求出之滲透係數，反向推求各濾層所捕捉到之懸浮細顆粒。最後根據研究成果，探討介質各層滲透係數隨阻塞量之變化。

關鍵字

滲透係數 ； 孔隙率 ； 孔隙介質

並列摘要

Abstract

Fluid can flow among the pores of the media under the action of gravity or pressure. In engineering, physical properties of the media are often used to remove the impurities or small particles in the fluid. However, the pores in the media will be blocked after some time and the effect of filtration will thus be reduced. The object of this research is to investigate the blocking effect of the pores by the suspending particles in the fluid, and time variation of the blocking filtrating permeability coefficient, which can be applied in refilling lakes, grouting and water treatment engineering.
In the research, both filtrating theory and sand box experiment are carried out. First, clean water and different grades of sand are used to investigate the relation between the pore ratio in the media and the filtrating coefficient. Then, the relation is verified by some experiential equations.
With this relation and the filtrating coefficients determined by different filtrating tests, the amount of small suspending particles trapped in each filtrating layer can be calculated. Finally, the stuffing variation of the filtrating coefficient for each layer can be discussed.

並列關鍵字

permeability coefficient ； filtration ； pore ratio

參考文獻

8.Irmay,S. (1954),“On the hydraulic conductivity of unsaturated soils,”Trans. Am. Geophys. Un., No.35, p.463-468.

10.Scheidegger,A. E. (1961),“General theory of dispersion in porous media,” J. Geophys. Res., No.66, p.3273-3278.

參考文獻

1.蘇燕珠(1993)，「土壤滲透性與孔隙分佈相關性之研究」，國立台灣大學農業工程學研究所碩士論文。

2.Amer,A. M. and A. A. Awad (1974),“Permeability of Cohesionless Solis,”