含懸浮質流體在孔隙介質之滲透係數研究

Study on the Coefficient of Permeability of Porous Media for Flow with Suspending Particles

馬志銘(Jyh-Ming Maa)

指導教授 ： 邱金火 ； 張德鑫

中原大學/工學院/土木工程研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300430

摘要

中文摘要
地下水在土壤孔隙介質中流動，常因為本身所攜帶的懸浮物或細顆粒雜質，造成孔隙阻塞現象。因此在做人工湖補注地下水工程時，往往會因為含水層內部孔隙受到懸浮質之阻塞，造成滲透係數變小而影響補注效率。其次，如新開發之農地剛開始有較大的滲漏量，可是隨時間增長之後，其滲漏量卻逐漸減少，其原因皆為介質中孔隙被阻塞之故。本研究目的即在探討含懸浮質流體在孔隙介質其滲透係數變化情形，並同時觀察懸浮物質在孔隙介質中的阻塞量。
本研究選用三種不同粒徑的砂來進行試驗，首先藉由物理性質分析了解此三種砂的比重和孔隙率等介質特性資料。其次以不含雜質之清水滲透試驗，求得各層孔隙介質初始之滲透係數值，做為計算推導式中相關係數及後續過濾試驗之參考。
由含懸浮質流體之過濾試驗，可知通過介質之含懸浮質流體流量會隨時間不同而改變，本研究並可根據流量及水頭差計算出各層之滲透係數值隨時間之變化，以及求出各分層之孔隙率變化及懸浮顆粒捕捉率。

關鍵字

none

並列摘要

Abstract
Groundwater is usually blocked by it`s suspending particles when flowing through the porous media of soil and cause blocking effect phenomenon. In groundwater recharge for lakes engineering, the porous media in the aquifer is often blocked and the coefficient of permeability is reduced and, therefore, affects it`s recharge efficiency. More further, there are more seepage for a new developing farm, but the seepage will decrease after some time when the porous media is blocked. The object of this research is to study the coefficients of permeability of porous media for flow with suspending particles and to observe the blockage in the porous media.
This research used three kinds of sands with different grades for experiments. First, the physical properties of the specific gravity and pore ratio of the sands were analyzed. Second, the initial coefficients of permeability in each layer were found by filtrating test with pure water. These initial coefficients can be as references for those in the theoretical derivation and for the filtrating experiments sequentially.
According to the filtrating test, the flow discharge with suspending particles changes with time. This research can find the time variation of the coefficient of permeability in each layer from the discharge and the difference of elevation head. Therefore, the variation of porosity and the capture ratio for suspending particles in each layer can be found.

並列關鍵字

none

參考文獻

15.陳瀅如(2002)，「含懸浮質流體於孔隙介質中阻塞現象之探討」，私立中原大學土木工程學系碩士論文。

16.楊承學(2003)，「水庫淤泥管路輸送主要損失研究」，私立中原大學土木工程學系碩士論文。

2.Carman, P.C. (1937), “Fluid Flow through a Granular Bed, “ Trans. Inst. Chem. Engrs, Lodon, No.15,p.150-156.

5.Gelhar, L. W. (1986), “ Stochastic Subsurface Hydrology from Theory to Ap-

plications, ”Water Resour. Res., Vol.22,No.9,pp.135S-145S.