Geotextile for landfill
Main Functions and Benefits:
1. Seepage Prevention and Isolation: The extremely low permeability of HDPE membranes prevents leachate from infiltrating into the ground, avoiding long-term groundwater contamination risks that could last for centuries.
2. Structural Protection: The upper and lower geotextile layers protect the central membrane from damage caused by gravel or mechanical impact, extending service life to over 50 years.
3. Reinforcement and Stabilization: Enhances overall stability of the landfill structure, preventing landslides and subsidence.
I. Geosynthetic clay liners (GCLs) in landfills are key impermeable materials used to prevent pollutant leakage and protect groundwater and the ecological environment. They are typically used in composite structures (e.g., two geotextiles with one geomembrane) and provide combined functions of waterproofing, isolation, reinforcement, and protection.
These materials are composed of nonwoven geotextiles and high-density polyethylene (HDPE) geomembranes. The geotextile provides tensile strength and puncture resistance, while the HDPE membrane serves as the primary waterproofing barrier, effectively preventing heavy metals and hazardous organic compounds in landfill leachate from entering the soil and groundwater. In landfill applications, this composite material is commonly laid on the bottom and side slopes, serving as the first line of environmental safety protection.
I. Main Functions and Benefits:
1. Seepage Prevention and Isolation: The extremely low permeability of HDPE membranes prevents leachate from infiltrating into the ground, avoiding long-term groundwater contamination risks that could last for centuries.
2. Structural Protection: The upper and lower geotextile layers protect the central membrane from damage caused by gravel or mechanical impact, extending service life to over 50 years.
3. Reinforcement and Stabilization: Enhances overall stability of the landfill structure, preventing landslides and subsidence.
4. Filtration and Drainage: Allows gas to escape while retaining particulate matter, working in conjunction with the drainage system to reduce internal pressure.
II. Material Selection Recommendations:
1. Prioritize the use of composite products combining spunbond nonwoven geotextile and HDPE membrane, as they offer superior resistance to aging and chemical corrosion.
2. In high-altitude cold or saline-alkali regions, customized solutions with low-temperature resistance and anti-salt corrosion properties should be selected.
3. During construction, ensure proper overlap width (typically ≥10 cm) and perform hot-melt welding to guarantee sealing integrity.
