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Geotextile, also known as geotextile fabric, is a water-permeable geosynthetic material made from synthetic fibers by needlepunching or weaving. Geotextile is one of the new materials in geosynthetic materials, with a finished product in the form of a cloth. It is generally 4-6 meters wide and 50-100 meters long. Needlepunched short-fiber geotextile is a type of nonwoven and industrial fabric. It is made from polyester crimp short fibers with a fiber fineness of 6-12 dte and a length of 54-64mm. Through the processes of open-ending, carding, entanglement (where short fibers interlace with each other), mesh laying (specification entanglement attachment), and needle punching, it is manufactured into a cloth-like material. It is mainly used in reinforcement of railway embankments, maintenance of highway surfaces, sports halls, protection of embankments, waterworks construction, tunnels, coastal wetlands, reclamation, and environmental protection projects.

The characteristics of geotextile

1. High strength, due to the use of plastic fibers, it can maintain sufficient strength and elongation in both wet and dry states.

2. Corrosion-resistant, able to withstand corrosion in different acidic and alkaline soils and water for a long time.

3. Good permeability: Since there are air spaces between the fibers, the material exhibits good water permeability.

4. Good antibacterial properties: It is not damaged by microorganisms or insect damage.

5. Construction is convenient, as the material is light and flexible, making it easy to transport, lay, and construct.

6、Specifications: Width up to 6 meters. It is the widest product in the domestic market, with a unit area weight of 100-1000g per square meter.

The role of geotextile

Quarantine

Utilizing polyester short-fiber needlepunched geotextiles to isolate construction materials with different physical properties (such as particle size, distribution, consistency, and density), such as soil and sand, soil and concrete, etc., to prevent the leakage and mixing of the materials, and to maintain the integrity of the materials.

The overall structure and function of the material enhance the bearing capacity of the structure.

2：Filtration (Backwashing)

When water flows from a fine-grained soil layer into a coarse-grained soil layer, polyester short-fiber needlepunched geotextiles with good air permeability and water permeability allow the water to pass through, effectively trapping soil particles, such as fine sand and small stones, to maintain the stability of the soil and water engineering.

Drainage

Polyester short fiber needlepunched geotextiles have excellent water drainage properties, allowing them to form drainage pathways within the soil mass, which can help to remove excess liquids and gases from the soil structure.

Reinforcement

Utilizing polyester short-fiber needlepunched geotextiles to enhance the tensile strength and resistance to deformation of soil masses, thereby enhancing the stability of the structural integrity of the construction, and improving the quality of the soil.

5: Protection

When water flows and erodes the soil, it effectively disperses, transfers, or breaks down concentrated stresses, preventing the soil from being damaged by external forces and protecting the soil.

6: Anti-puncture

Combined with geomembrane to form a composite waterproof and anti-seepage material, it plays a role in preventing puncture. It has high tensile strength, good permeability, good air permeability performance, resistance to high temperature, freezing resistance, resistance to aging, corrosion resistance, and is not susceptible to insect damage. Polyester short fiber needle-punched geotextile is a widely used geosynthetic material. It is widely used in the reinforcement of railway roadbed, the maintenance of highway pavement, the protection of sports halls, levees, water engineering construction isolation, tunnels, coastal wetlands, reclamation, environmental protection and other projects.

Geotextile is mainly divided into the following three series:

1. Nonwoven geotextile needles, specifications between 100g/m2-600g/m2 are available for selection. The main raw materials are polyester short fibers or polypropylene short fibers, which are made by needle-punching process. The main application is: slope protection of river, sea, lake and river levees, reclamation of sea, wharves, ship locks, flood control and emergency repairs, etc. It is an effective way to maintain soil and water conservation and prevent pipe jams through filtration.

Section Two: Nonwoven Geotextiles Composed of Needle-punched Polyester and PE Membrane Specifications: One-layer or Two-layer Geotextiles with a maximum width of 4.2 meters. Main raw materials: Needle-punched polyester nonwoven fabric and PE membrane. Main uses: Anti-permeation, suitable for projects such as railways, expressways, tunnels, subways, airports, etc.

Three, nonwoven and woven geotextiles, including nonwoven and polypropylene filament woven composite, nonwoven and plastic woven composite, are suitable for basic reinforcement and infrastructure for adjusting permeability coefficients.

Geotextile Application Fields

(1) Reinforcing in backfilling for retaining walls, or for anchoring the panels of retaining walls. Constructing enveloping retaining walls or abutments.

(2) Reinforce flexible pavement and repair cracks in the road to prevent reflective cracks in the road surface.

(3) Increase the stability of the gravel slope and reinforced soil, preventing soil erosion and frost damage to the soil mass in low temperatures.

(4) The isolation layer between the roadbed and the roadbed ballast, or between the roadbed and the soft foundation.

(5) Artificial filling, rock or material fields and the isolation layer between the foundation and the different frozen soil layers. The role of filtration and reinforcement.

(6) The filter layer on the initial upstream dam surface of the ash reservoir or tailings dam, and the filter layer in the drainage system of the backfilling soil of the retaining wall.

(7) Filter layer around the drainage pipe or around the gravel drainage ditch.

(8) The filtration layer in wells, pressure reduction wells, or oblique pressure pipes in hydropower engineering.

(9) The soil-engineering fabric isolation layer between roadways, airports, railway embankments, and artificial rock piles, and the foundation.

(10) Vertical or horizontal drainage within earth dams, which is buried in the soil to dissipate the interstitial water pressure.

(11) Drainage in the anti-seepage geomembrane behind or under the concrete protection at the earth dam or earth levee.

(12) Drainage of seepage around tunnel to reduce the external water pressure on the lining and seepage around the structures.

(13) Drainage of the artificial fill land for the foundation of the sports ground.

(14) In engineering projects such as highways (including temporary roads), railways, embankments, earth-rock dams, airports, sports fields, etc., it is used to strengthen weak foundations.