土工织物覆砂渗透特性试验研究

Experimental study on permeability characteristics of sand covered with geotextile

土工管袋是由充填砂及袋体材料共同组成的非均质结构,其渗透特性较充填砂有所区别。作为管袋系统渗流机制研究的基础,利用有、无土工织物覆砂条件下的渗透试验探究土工织物对充填砂渗透特性的影响。通过对比有、无土工织物覆砂条件下的渗透系数及砂颗粒的运移规律发现:土工织物对于砂料中的细砂颗粒的流失具有抑制作用,并可与砂料形成稳定的反滤结构,导致土工织物覆砂条件下的渗透系数小于同级配纯砂的渗透系数。

Geotechnical pipe bag is a heterogeneous structure composed of sand filling and bag body material,and its permeability characteristics are different from sand filling.As the basis for the study of the seepage mechanism of the tube bag system,this paper uses the permeability test with and without geotextile sand covering to explore the influence of geotextile on the permeability characteristics of sand filling.By comparing the permeability coefficient and the movement law of sand particles with and without geotextile covered sand,it is found that geotextile has an inhibitory effect on the loss of fine sand particles in the sand,and can form a stable filter with the sand.The structure results in that the permeability coefficient of geotextile covered with sand is smaller than that of pure sand of the same grade.