The reverse filter geotextile is the common geotextile, can permeate water, can not pass through the silt, plays the filtration function.

Reverse filtration means to keep the soil particles under osmotic pressure from losing while allowing the liquid to pass through.

As the direction of the filtered water is opposite, it is called reverse filtration.

To counter wrapped reinforced sand retaining wall provides the basis for design and construction, with iron wire netting and fiber screens of reinforced sand wrapped reinforced retaining wall for geotechnical centrifuge model test, the comparison and analysis the wall subsidence and metope level displacement and earth pressure inside the wall and reinforcement materials the changing law of strain with the increase of centrifugal acceleration, at the same time, should strengthen the connected to the upper geogrid geogrid, and to ensure that the buried in sand filling with enough length, avoid the failure in parts of the geogrids.

Lay a layer of anti-filter geotextile between the retaining wall filling sand and the anti-wrapping geotextile grille to avoid the anti-wrapping part being emptied.

Short-filament needle-punched geotextile can replace the traditional sand-gravel filter layer, and has the advantages of reduced engineering volume, convenient construction, and fast speed. In water conservancy projects, it can effectively prevent piping and seepage, and prevent the collapse of dams. The two functions of filtration and drainage of geotextiles are always inseparable and complementary to meet the requirements of draining seepage water from the soil to avoid soil damage. Because of this, geotextile manufacturers have introduced anti-filter geotextiles. The so-called anti-filter geotextile refers to the use of geotextile to allow liquid in the soil to pass through, while preventing the passage of skeleton soil particles, thereby preventing soil damage due to excessive soil particles loss, and allowing water or gas in the soil It is free to discharge through the fabric to avoid soil instability due to the increase of pore water pressure.

The anti-filtration geotextile has an anti-seepage effect that ordinary waterproof materials cannot match. 　The anti-filtration geotextile has excellent chemical stability and is widely used in sewage treatment, chemical reaction tanks, and landfills. Since the filter geotextile overcomes the shortcomings of traditional granular materials, such as limited sources, complicated construction, and time-consuming, and has the dual functions of drainage and filter, it can meet the requirements of the filter layer's water permeability and soil retention. A lot of use and promotion. Due to the placement of nearby drainage bodies in the soil or the escape of soil seepage, it is often the place where groundwater seepage changes drastically. High and low temperature resistance, asphalt, oil and tar resistance, acid, alkali, salt, etc. more than 80 kinds of strong acid and strong alkali chemical media corrosion and aging resistance---filter geotextile has excellent anti-aging, anti-ultraviolet, anti-decomposition ability, and can be exposed The material has a service life of 50-70 years when used, which provides a good material guarantee for environmental seepage prevention.