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What‘s Woven Geotextile?
Lianyi®Woven Geotextile refers to geotextile produced by Weaving (also known as shuttling or Weaving) technology. It is composed of two sets of parallel yarns (warp yarns and weft yarns) interwoven at a 90-degree Angle, forming a fabric with stable structure and high strength. This type of geotextile, due to its excellent mechanical properties, is mainly applied in the fields of reinforcement and separation.
Production Process and Raw Materials
1.Raw materials
*Polypropylene (PP) or polyester (PET) are the most commonly used raw materials because they possess high strength, chemical resistance and microbial resistance.
*Yarn form: Usually, flat Yarns (Tape Yarns or Fibrillated Yarns), monofilament Yarns (single filament Yarns), and multi-filament yarns (multi-filament yarns) are used for weaving.
*Flat filament: Made by cutting and stretching plastic film, it is the most common form for manufacturing high-strength and low-cost woven geotextiles (similar to the material of plastic woven bags).
*Monofilament/multifilament: It can produce woven geotextiles with more uniform pores and better permeability, but the cost is usually higher.
2.Process: On a large loom, the warp and weft yarns are interwoven according to a specific structure (such as plain weave) to form a strong and dimensionally stable fabric roll.
Features Of Woven Geotextile
The performance characteristics of woven geotextiles are very distinct, which stems from their woven structure:
*High tensile strength and low elongation: These are its most prominent advantages. They can withstand extremely high loads with minimal deformation, making them highly suitable for projects that require reinforcement and stability.
*High modulus: It exhibits very high stiffness at the initial stage of force application.
*Excellent puncture and tear resistance: With a compact structure, it can effectively resist damage from rough fillers such as crushed stones.
*It exerts strength at a relatively low strain: It can provide effective reinforcement even when the soil undergoes very small deformation.
*Uniform and controllable pore size: By adjusting the yarn type and weaving density, products with different opening sizes (AOS) can be produced, but their porosity is usually lower than that of nonwoven geotextiles.
*Permeability: Its water permeability capacity depends on the size and number of pores. Compared with nonwoven geotextiles, its water flow conductivity (water conductivity) in the plane is usually better, but its permeability in the vertical direction is lower.
Functions and Applications Of Woven Geotextile
The core functions of woven geotextiles are “reinforcement” and “separation”, and sometimes they are also used for “filtration”, but careful selection is needed.
1.Reinforcement
Principle: By taking advantage of its high strength and low elongation characteristics, it disperses the load and enhances the overall stability and bearing capacity of the soil mass.
Application
*Road/railway subgrade on soft soil foundation: Laid on soft foundation to prevent the filling material from sinking and to disperse vehicle loads.
*Steep retaining walls and slope reinforcement: Combined with soil to form a solid composite structure, resisting earth pressure and landslides.
*Reinforced soil structure.
2.Separation
Principle: It is laid between two different types of materials (the lower layer of soft soil and the upper layer of crushed stone base) to prevent them from mixing with each other and maintain their respective structural integrity.
Application
Road base layer: Prevent the crushed stone base layer from sinking into the lower soft soil, while allowing water to pass through, and extend the service life of the road.
3.Filtration (conditional use)
Principle: Allow water to pass through while preventing excessive loss of soil particles. Woven geotextiles can achieve “unidirectional filtration” due to their relatively uniform pore diameters.
Application
It is used in situations that require high strength and high drainage performance, such as the drainage body wrapping of earth-rock DAMS and the gravel layer under coastal protection.
Keywords:
1.Woven Geotextile