无纺土工织物渗透淤堵试验研究  

Experimental study on infiltration and clogging of non-woven geotextiles

作　　者：魏松[1] 龚明 WEI Song;GONG Ming(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第3期383-388,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51579063,51409076)。

摘　　要：无纺土工织物作为滤层在工程实践中已广泛应用,但因淤堵而存在滤层失效的隐患,开展无纺土工织物渗透淤堵试验研究很有必要。文章通过系列考虑土样黏粒含量、密实程度因素的不同等效孔径无纺土工织物渗透淤堵试验,总结了梯度比、渗透系数以及织物单位体积含土量变化规律,探讨了淤堵机理。结果表明:土样黏粒含量、密实程度以及织物等效孔径均会对土工织物的渗透淤堵特性产生影响;当土样黏粒含量较低、织物等效孔径较大时,淤堵易发生在织物内部;而当土样黏粒含量较大、织物等效孔径较小时,淤堵易发生在织物表面。In engineering practice,non-woven geotextiles have been widely used as filters.However,because of the clogging of the non-woven geotextiles,there is a hidden danger of filter layer failure.Therefore,it is necessary to carry out the research on infiltration and clogging of non-woven geotextiles.In order to explore the reasons of clogging,this paper designs different infiltration and clogging tests on non-woven geotextiles of different equivalent apertures with the consideration of clay contents and density degrees of the soil sample.Then it concludes the law of gradient ratio,permeability coefficient and soil content per unit volume of the geotextiles.The results show that the clay contents and density degrees of the soil sample and the equivalent apertures of the geotextiles will affect the infiltration and clogging characteristic of the geotextiles.When the clay content of the soil sample is low and the equivalent aperture of the geotextiles is big,the clogging is likely to occur inside of them;when the clay content of the soil sample is high and the equivalent aperture of the geotextiles is small,the clogging is easy to occur on the surface of them.

关 键 词：黏粒含量 土工织物 梯度比 渗透系数 淤堵试验 

分 类 号：TV41[水利工程—水工结构工程]