有纺土工织物覆土条件下的渗透特性试验研究

分别配制不同孔隙比的粉砂、标准砂和黏土试样,采用自主研制的一套多功能渗透试验装置,开展了一系列纯土和有纺土工织物覆土条件下的渗透试验,对比分析了这两种条件下渗透系数的差异,并探讨了有纺土工织物与土共同作用下的渗透机理。结果表明,有纺土工织物对于土体渗流略有一定的抑制作用,表现为覆土条件下的渗透系数略小于纯土的渗透系数,但是对于粉砂,当其孔隙比比较大、细砂颗粒的含量相对较多时,细砂颗粒则有可能在渗流作用下通过有纺土工织物孔隙而产生流失,使得覆粉砂条件下的渗透系数略大于纯粉砂的渗透系数。

Experimental study on permeability of woven geotextile covered with soil

The specimens of silty sand, standard sand and clay with different void ratios are prepared. By utilizing a multifunctional permeability test apparatus, a series of permeability tests are carried out under the conditions of pure soils and woven geotextiles covered with soils. The difference in hydraulic conductivity under these two conditions is analyzed by comparisons. The mechanism of seepage under the interaction between geotextile and soil is discussed. The results show that the woven geotextile has a slight suppression effect on the seepage of soil, resulting in the case that the hydraulic conductivity of the geotextile covered with soil is a bit lower than that of the soil. However, for the silty sand with a relatively large void ratio and a relatively high content of fine sands, loss of fine sand grains owing to passing through the voids of woven geotextile may take place under the actions of seepage. This will result in the case that the hydraulic conductivity of the geotextile covered with silty sand is a bit higher than that of the silty sand.