Needle-Punched Geotextile
1. Exceptionally high strength: It has the highest tensile strength among geotextiles, making it particularly suitable for soil stabilization projects.
2. High modulus of elasticity and low deformation: effectively restrains soil deformation under load.
3. Uniform and controlled pore size: easily designed to meet specific filtration or drainage requirements.
4. Excellent durability: Corrosion-resistant raw materials ensure long service life when properly coated.
I. Basic definition
Woven geotextiles, also known as woven geotextiles, are geosynthetic materials resembling fabrics produced using traditional textile technologies. They are produced by weaving synthetic fiber threads or flat tapes (such as polypropylene or polyester) in the longitudinal (warp) and transverse (weft) directions on a loom.
Essentially, it's an "industrial fabric." However, thanks to the use of high-strength synthetic fibers and its application in geotechnical construction, it possesses specific engineering properties.
II. Main characteristics (compared to conventional non-woven geotextile materials)
Characteristic | Woven geotextile | Non-woven geotextiles (mainly needle-punched) |
Production process | Woven (plain, twill, satin weave) | A fibrous mesh formed by needle-punched, thermal or chemical bonding |
Structure | Regular, dense interwoven warp and weft structure | An irregular, loose three-dimensional fibrous network structure |
Mechanical properties | High tensile strength, high modulus of elasticity, low elongation. Low deformation under load ensures strong reinforcement. | Relatively low tensile strength, high elongation, good toughness. |
Hydraulic properties | Relatively uniform and controlled pore size, primarily for water drainage (in-plane drainage). Vertical permeability depends on the thread density and thickness; generally, filtration properties (soil retention) are inferior to high-quality nonwoven geotextiles. | Three-dimensional pore distribution that combines filtration (soil retention and protection against clogging) and drainage functions. |
Basic functions | Reinforcement, separation, protection, drainage in the plane. | Filtration, separation, drainage, protection. |
III. Primary raw materials
Polypropylene (PP): the most common, inexpensive, resistant to acid and alkali corrosion, but slightly inferior in resistance to aging under the influence of ultraviolet radiation.
Polyester (PET): Higher strength, high elastic modulus, good creep resistance, excellent UV resistance compared with PP, but slightly weaker resistance to strong alkali.
Yarn forms:
Flat yarn:It is produced by cutting and stretching film and serves as the main material for woven fabrics (a common type of machine-woven fabrics). It is characterized by low cost and high strength.
Filament yarn:Made from continuous threads, it provides a more uniform fabric surface with superior performance.
IV. Basic functions and engineering applications
Reinforcing function
Principle:Uses high tensile strength to create friction with the soil, distributing localized loads over a larger area, increasing soil integrity and stability.
Application:Treatment of weak foundations, reinforced soil retaining walls, stabilization of steep slopes, strengthening of road bases, etc.
Split function
Principle:Placed between different materials (e.g. base and soft soil, crushed rock and soft soil) to prevent them from mixing and maintain the design properties of each layer.
Application:Under railway and road beds to prevent crushed stone from penetrating soft soil; at waste landfills to isolate various layers.
Protective function
Principle:Uses high strength as a buffer layer to protect underlying waterproofing materials (e.g. geomembranes) or weak soil layers from puncture or erosion by sharp aggregate from above.
Application:Protective layer for geomembranes; filtering underlayer for coastal protection structures.
Planar drainage function (water drainage)
Principle:It has excellent water conductivity along its flat surface (main and weft directions), which allows it to collect and drain water or gas from the ground.
Application:Drainage behind retaining walls, internal drainage of earth dams, drainage of sports ground foundations, etc.
V. Advantages and Limitations
Advantages:
Very High Strength: Has the highest tensile strength among geotextiles, making it particularly suitable for reinforcement projects.
High modulus of elasticity and low deformation: Effectively limits soil deformation under load.
Uniform and controlled pore size: Easily designed to meet specific filtration or drainage requirements.
Good Durability: Corrosion-resistant materials provide long service life when properly coated.
Restrictions:
Filtration capacity (soil retention):The regular "channel" pores of woven geotextiles are generally inferior to high-quality non-woven geotextiles (with their three-dimensional mesh structure), which are more effective in preventing the loss of fine-grained soil.
Adaptation to deformation:It is less flexible than non-woven materials, follows the contours of the ground surface worse, and does not adapt as well to its deformations.
Price:High-quality woven materials (such as those woven from thread) can be more expensive than standard non-woven geotextiles.
VI. Construction Considerations
Styling:Geotextiles are laid flat and tight to the base, without folds or wrinkles. The direction of the loads (usually the direction of the base) should be perpendicular to the main stress line or parallel to the slope.
Compound:Typically, overlaps (30–100 cm wide), stitching, or special connectors are used. For reinforcement projects, the strength of the joints is critical.
Protection:After installation, the geotextile should be immediately covered with backfill to avoid prolonged exposure to ultraviolet radiation. Direct compaction of exposed geotextile with heavy equipment during backfilling is not permitted.
Material selection:Select the appropriate grade and characteristics of woven geotextile according to the design requirements (strength, pore size, permeability coefficient) and the soil conditions at the site.
Company Profile
Shandong Yuanpeng Environmental Protection Technology Co., Ltd. was founded in 2022 with a registered capital of RMB 50 million. The company employs over 300 people and operates a 35,000-square-meter production facility. Equipped with a professional technical research and development team, Yuanpeng is a comprehensive company integrating production, sales, and after-sales service.
The company's main markets are Southeast Asia, Europe, and North and South America, with exclusive distributors in Indonesia and Kuwait. Due to continued business expansion, in 2022, a branch, Taian YPHB, was opened in the capital of Jinan Province, focusing on foreign trade and import/export activities.
