Abstract
The use of geotextile filters has been a common application in geo-environmental and geotechnical engineering for decades. The purpose of the present paper is to assess the influence of artificial physical clogging and cyclic water flow on the water permeability characteristics of nonwoven geotextiles used commonly in filter and drainage systems. Despite many studies examining the behavior of soil-geosynthetics, the mechanism of physical clogging is not fully understood yet and remains incompletely defined. Artificial clogging and cyclic water flow tests have been conducted according to a procedure created by the authors. Three nonwoven geotextiles and silty sand were employed in the test series. Hydraulic properties of the tested geosynthetics were determined according to the ISO standard. Filter design criteria are also discussed. The paper also presents the changes of water permeability characteristics due to clogging and cyclic water flow. The results show significant decrease of water permeability coefficients of the tested nonwoven geotextiles after artificial clogging and under cyclic water flow. Furthermore, the clogging mechanism was observed and confirmed by three-dimensional computed tomography.
Highlights
Geosynthetics are modern engineering materials, which have been widely used in soil structures for reinforcing, separation, filtration, and drainage [1,2,3,4,5,6,7,8,9,10]
The main functions of geotextile filters are to prevent the movement of fine particles from the base soil and to avoid the development of excessive pore water pressure on the soil–geotextile filter interface
The selection of particular nonwoven geotextiles for particular places is a critical decision and the hydraulic properties of the material should be measured [18,19], especially, because in drainage and filter applications, nonwoven geotextiles are the first to be in contact with soft, saturated, and fine soils [20]
Summary
Geosynthetics are modern engineering materials, which have been widely used in soil structures for reinforcing, separation, filtration, and drainage [1,2,3,4,5,6,7,8,9,10]. The selection of particular nonwoven geotextiles for particular places is a critical decision and the hydraulic properties of the material should be measured [18,19], especially, because in drainage and filter applications, nonwoven geotextiles are the first to be in contact with soft, saturated, and fine soils [20]. A geotextile filter includes the geotextile, the interface between the geotextile and the natural soil (filter cake) and the interface between the nonwoven geotextile and the drainage material [21]. For this reason, a geotextile filter should be considered as a filtering zone that evolves over time.
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