Product Overview

Tunnel Geomembrane is a specially engineered lining material used in tunnel construction to provide waterproofing and prevent water infiltration into tunnels and underground structures. It is manufactured from high-quality HDPE (High-Density Polyethylene) or PVC (Polyvinyl Chloride), materials known for their excellent chemical resistance, UV stability, and mechanical strength. The geomembrane is typically used to line the tunnel walls, floors, and ceilings, ensuring the tunnel remains dry, stable, and resistant to water-related damage over its lifespan.

As tunnels are often subjected to high water pressure, soil movement, and chemical exposure, the Tunnel Geomembrane serves as a reliable barrier that protects the tunnel structure from water leakage, corrosion, and soil erosion, ensuring long-term structural integrity and safety for both the tunnel and its users.

Product Features

• Waterproofing: The Tunnel Geomembrane acts as an effective barrier against water infiltration, preventing water from entering tunnels and underground structures. This is crucial in maintaining dry conditions and protecting the tunnel infrastructure from moisture-related damage.
• Chemical Resistance: With resistance to a broad range of chemicals, including acidic and alkaline solutions, the geomembrane helps protect the tunnel from soil contaminants, chemicals in groundwater, and pollutants.
• UV and Ozone Resistance: The geomembrane is designed to withstand UV degradation and ozone exposure, which is particularly important for tunnels with ventilation shafts or for geomembranes exposed to direct sunlight during installation.
• High Mechanical Strength: Engineered for durability, the geomembrane offers high tensile strength and puncture resistance, ensuring it can withstand pressure from surrounding soil, shifting ground, and dynamic loads.
• Flexibility: It remains flexible even under low temperatures, which is essential for easy installation and performance in varying environmental conditions.
• Long-Lasting Performance: Due to its robust construction and resistance to environmental stressors, the Tunnel Geomembrane offers long-term reliability with minimal maintenance required.
• Easy Installation: The geomembrane is designed to be easy to transport, handle, and install in tunnels, minimizing construction time and costs.

Product Specifications

• Material: Made from HDPE (High-Density Polyethylene) or PVC (Polyvinyl Chloride), both of which are durable, resistant to chemicals and UV radiation, and offer excellent impermeability.
• Thickness: Available in various thicknesses, typically ranging from 0.8 mm to 2.5 mm, depending on project requirements and environmental conditions.
• Width: Standard widths range from 4 meters to 6 meters, though custom widths can be produced for specific tunnel sizes or project requirements.
• Length: Rolls typically come in lengths ranging from 50 meters to 100 meters, and custom lengths can be provided for large-scale projects.
• Tensile Strength: Tensile strength generally ranges from 20 MPa to 30 MPa, which ensures that the geomembrane can handle the mechanical stress and pressures experienced in tunnel environments.
• Elongation at Break: Typically 12% to 25%, which provides flexibility during installation and accommodates movement within the tunnel structure.
• Permeability: Very low permeability (less than 1 x 10^-13 cm/s), making the geomembrane highly effective at preventing water penetration.
• Color: Typically black to provide UV resistance and reduce algae growth. Custom colors may be available for specific applications.

Applications

• Tunnel Lining: Tunnel Geomembrane is primarily used to line tunnels, providing waterproofing and protection against water ingress and contamination. This is particularly useful for tunnels in high-water-table areas or those that are exposed to water seepage from surrounding soil.
• Subway Systems: Applied in subway systems to prevent water from entering underground transit routes, ensuring dry, safe, and stable environments for commuters.
• Underground Utility Tunnels: Used in the construction of tunnels housing underground utilities like power cables, gas lines, and water pipes, to prevent water ingress and protect critical infrastructure.
• Hydroelectric Dams: Ideal for use in tunnels that lead to hydroelectric plants or water diversion systems, where waterproofing and erosion control are essential.
• Stormwater Tunnels: Provides an effective solution for stormwater management tunnels, preventing water from eroding tunnel structures or flooding underground areas.
• Metro and Railway Tunnels: Protects metro and railway tunnels from water infiltration and soil-related issues, ensuring smooth and safe operations.
• Mine Tunnels: Used in mining projects to line ventilation shafts, ore tunnels, and other underground structures to keep water out and protect the integrity of the mine.

Construction Recommendations

1. Site Preparation: Before installing the geomembrane, ensure that the tunnel site is free of debris, sharp objects, and any other materials that could damage the geomembrane during installation. The surface should be smooth and level to facilitate proper contact between the geomembrane and the underlying surface.

2. Installation Method: Unroll the Tunnel Geomembrane over the tunnel structure, ensuring the material is free from wrinkles or folds. The geomembrane should be aligned with the contours of the tunnel, and seams should be welded using heat or extrusion welding methods.

3. Seam Welding: Use high-quality welding equipment to join the edges of the geomembrane sheets. Ensure that all seams are thoroughly tested for leaks using vacuum or air pressure methods. Proper seam welding is crucial to ensure the geomembrane performs as an effective barrier.

4. Protection During Installation: To avoid punctures or damage, handle the geomembrane with care during installation. Use geotextile fabrics or protective layers when necessary to shield the geomembrane from sharp objects or excessive mechanical stress during installation.

5. Backfilling and Covering: After installation, cover the geomembrane with a layer of protective material, such as soil, gravel, or sand. This helps to protect the geomembrane from UV exposure, physical damage, and ensures long-term functionality in the tunnel.

6. Inspection and Maintenance: Regular inspections should be conducted to check for any damage, wear, or degradation in the geomembrane. Prompt repairs should be carried out using compatible welding or patching methods to maintain the integrity of the waterproofing system.