National Industrial Standard for Geotextiles GB/T17639-1998; Geotextile synthetic materials refer to polymers used in geotechnical and civil engineering; This standard is one of the standards of geosynthetics series products, which is filament spunbonded; This standard is proposed by the State Bureau of Textile Industry; This standard is issued by the Industrial Textiles Branch of the National Technical Committee for Textile Standardization; This standard is drafted by China National Academy of Textile Sciences, and by Nuclear Industry Hunan; Filament spunbonded needle punched nonwoven geotextile GB ／ T17639-19; This standard specifies filament spunbonded needle punched nonwoven geotextiles
3 Product classification, specification and code 3.1 Product classification and variety
The filament spunbonded needle punched nonwoven geotextiles can be divided into polyester, polypropylene, nylon, ethylene and other filament spunbonded needle punched geotextiles according to fiber types; According to the structure, it can be divided into ordinary type and compound type.
The variety of filament spunbonded needle punched nonwoven geotextile is designed by the production department according to the market demand. 3.2 Product specifications
The main specifications of the product are expressed in terms of mass per unit area and width. The recommended series are as follows: mass per unit area (g/m2): 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 800, etc; Width (m): 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, etc. Special needs can be designed according to requirements. 3.3 Product code
The codes of filament spunbonded needle punched nonwoven geotextiles are as follows:
Filament spunbonded needle punched nonwoven geotextile (C means composite) can be omitted when it is not confused;
(1) Fiber code: PET polyester, PP polypropylene, PA nylon, PE ethylene, polyester can be omitted; (2) Mass per unit area of finished products, expressed in grams per square meter (g/m2);
(3) The mass per unit area of filament spunbonded needle punched nonwoven geotextile in composite products, expressed in grams per square meter (g/m2), is a non composite vacancy; (4) Breadth, expressed in meters (m);
(5) Production department number: it can express more specific characteristics, functions, varieties, sequences, etc. of products.
Example: FNG PP450-4.5 polypropylene filament spunbonded needle punched nonwoven geotextile, with a unit area mass of 450g/m2 and a width of 4.5m.
FNG/C 600/250-4 polyester filament spunbonded needle punched composite geotextile, with a unit area mass of 600 g/m2, including polyester filament spunbonded needle punched nonwoven geotextile, with a unit area mass of 250 g/m2 and a width of 4m.
application area
(1) It is used as reinforcement in the backfilling of retaining wall or as the panel for anchoring the retaining wall. Build wrapped retaining walls or abutments. Application of geotextile in construction
(2) Reinforce the flexible pavement, repair the cracks on the road, and prevent the pavement from reflecting cracks.
(3) Increase the stability of gravel slope and reinforced soil to prevent water and soil loss and frost damage of soil at low temperature.
(4) The isolation layer between ballast and subgrade, or between subgrade and soft foundation.
(5) The isolation layer between artificial fill, rockfill or material yard and foundation, and the isolation between different frozen soil layers. Filtration and reinforcement.
(6) The filter layer of the upstream dam surface at the initial stage of the ash storage dam or tailings dam, and the filter layer of the drainage system in the backfill soil of the retaining wall.
(7) The filter layer around the drainage pipe or gravel drainage ditch.
(8) The filter layer of water well, relief well or baroclinic pipe in hydraulic engineering.
(9) The geotextile isolation layer between the road, airport, * * * road, artificial rockfill, etc. and the foundation.
(10) The internal vertical or horizontal drainage of the earth dam is buried in the soil to dissipate the pore water pressure.
(11) Drainage behind the anti-seepage geomembrane or under the concrete cover in the earth dam or earth embankment.
(12) Eliminate water seepage around the tunnel, reduce the external water pressure on the lining and water seepage around the buildings.
(13) Drainage of artificial fill ground sports ground.
(14) Highway (including temporary road) * * *, embankment, earth rock dam, airport, sports ground and other projects are used to strengthen soft foundation.
(1) Drainage of artificial fill ground sports ground.
(2) The filter layer around the drainage pipe or gravel drainage ditch.
(3) The filter layer of water well, relief well or baroclinic pipe in hydraulic engineering.
(4) It is used as reinforcement in the backfilling of retaining wall or as the panel for anchoring the retaining wall.
(5) Reinforce the flexible pavement, repair the cracks on the road, and prevent the pavement from reflecting cracks.
(6) The internal vertical or horizontal drainage of the earth dam is buried in the soil to dissipate the pore water pressure.
(7) Drainage behind the anti-seepage geomembrane or under the concrete cover in the earth dam or earth embankment.
(8) The isolation layer between ballast and subgrade, or between subgrade and soft foundation.
(9) The geotextile isolation layer between the road, airport, * * * road, artificial rockfill, etc. and the foundation.
(10) Eliminate water seepage around the tunnel, reduce the external water pressure on the lining and water seepage around the buildings.
(11) Increase the stability of gravel slope and reinforced soil to prevent water and soil loss and frost damage of soil at low temperature.
(12) The filter layer of the upstream dam surface at the initial stage of the ash storage dam or tailings dam, and the filter layer of the drainage system in the backfill soil of the retaining wall.
(13) Highway (including temporary road) * * *, embankment, earth rock dam, airport, sports ground and other projects are used to strengthen soft foundation.
(14) The isolation layer between artificial fill, rockfill or material yard and foundation, isolation between different frozen soil layers, filtration and reinforcement.
