Recommended waterproof geomembrane for tunnels
Release time:
2025-12-26
Tunnel waterproof geomembrane is a core material for ensuring the long-term stability of underground engineering projects. Selection must closely consider working conditions, performance suitability, and construction feasibility.The following are precise recommendations:
Tunnel waterproof geomembrane is a core material for ensuring the long-term stability of underground engineering projects. Selection must closely consider working conditions, performance suitability, and construction feasibility. The following are precise recommendations:
Two core tunnel waterproof geomembrane products are recommended: HDPE geomembrane is recommended for high water pressure, corrosive strata, or sewage tunnels. The black material offers excellent chemical corrosion resistance and puncture resistance. Combined with a pre-laid reverse bonding process, it avoids water seepage risks and offers superior durability. The two-layer geotextile-one-layer membrane composite geomembrane is suitable for conditions such as fractured surrounding rock and uneven shotcrete surfaces. The combination of 300g/㎡ geotextile and a 0.8-1.0mm membrane layer provides both seepage prevention and protection, reducing construction damage.
Key specifications require careful control: Thickness is recommended to be no less than 1.5mm, upgraded to 2.0mm for high-risk scenarios; width should be prioritized at 2-3 meters to reduce overlaps and improve seepage prevention reliability; performance should meet requirements for high tensile strength, low-temperature flexibility, and good weldability. In extremely cold regions, low-temperature embrittlement resistance needs to be strengthened, and in corrosive environments, chemical resistance is a key focus.
The recommended construction method is a combination of "nail-free installation + double-track hot-melt welding." Welds must be inspected using the air-filling method. Reinforcing layers must be added to weak points such as corners and expansion joints to form a comprehensive waterproofing system. These targeted recommendations ensure effective waterproofing while maintaining cost-effectiveness and extending the tunnel's service life.
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