GEOTEXTILE

Geotextile

1. Core Functions in Landfill LinersGeotextiles serve as critical components in composite liner systems by providing:
✔ Filtration – Prevents fine soil particles from clogging drainage layers
✔ Protection – Shields geomembranes from puncture (up to 500N resistance)
✔ Drainage – Enhances leachate collection efficiency (transmissivity >10⁻⁴ m²/s)
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2. Material Selection Criteria

Parameter	Landfill-Specific Requirements	Test Standard
Mass per Unit Area	300–800 g/m²	ASTM D5261
Puncture Resistance	≥500 N	ASTM D6241
Gradient Ratio	<3.0	ASTM D5101
Chemical Resistance	pH 2–12 stable	EPA 9090

Recommended Types:

Nonwoven (NW): Needle-punched PET for filtration
Woven (W): High-strength PP for reinforcement

3. Layered Landfill Liner System

Subgrade Preparation (Compacted to 95% Proctor)
Geotextile Cushion Layer (300g/m² NW)
HDPE Geomembrane (1.5–2.5mm, ≤10⁻¹³ cm/s permeability)
Geocomposite Drainage Layer (NW geotextile + drainage core)
Protective Geotextile Cover (500g/m² NW)

4. Key Installation Protocols

4.1 Geotextile Deployment

Overlap seams: 300mm minimum
Anchoring: Trenches at slope crests/toes
Avoid: UV exposure >48 hours before covering

4.2 Critical Interfaces

Interface	Solution
Geotextile/Geomembrane	Textured geomembrane (friction angle >30°)
Geotextile/Drainage Core	Heat-bonded lamination

4.3 Quality Assurance

Seam strength: ≥50% parent material (ASTM D4884)
Flow capacity: ≥0.01 cm²/sec under 50 kPa (ASTM D4716)

5. Performance Advantages

Benefit	Technical Impact
Leachate collection efficiency	40% higher vs. granular systems
Geomembrane lifespan extension	2–3x reduction in puncture damage
Construction cost savings	25% less aggregate required

6. Regulatory Compliance

✔ EPA Subtitle D (Municipal Solid Waste)
✔ EU Landfill Directive 1999/31/EC
✔ GRI-GT13 (Geotextile Specification)

Failure Prevention Tips:
⚠ Leachate clogging: Select geotextiles with O₉₀ < soil D₈₅
⚠ Slope instability: Use high-friction woven geotextiles on steep slopes

Keywords: Landfill liner geotextile, Leachate collection, Geomembrane protection, Anti-clogging filtration

Need a site-specific design? We provide:
→ Hydraulic conductivity calculations
→ Third-party weld testing
→ CAD details for pipe penetrations

(Meets ASTM D5819 & EN 13254 standards for landfill applications)

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