1. Material Preparation
Select geotextile materials that meet design requirements (e.g., polyester or polypropylene, with specified thickness and permeability).
Ensure the geotextile is free from damage, holes, or impurities before use.
2. Base Surface Treatment
Clean the tunnel lining surface, removing sharp protrusions, debris, and loose particles to prevent damage to the geotextile.
Repair cracks and uneven areas to ensure a smooth substrate.
3. Geotextile Laying
Lay the geotextile along the tunnel profile, ensuring tight adhesion to the substrate without wrinkles or air pockets.
Use overlapping seams (typically 10–20 cm) and secure them with hot-welding or adhesive methods.
For curved sections, cut and fit the geotextile appropriately to maintain continuity.
4. Fixation & Protection
Secure the geotextile with mechanical fasteners (e.g., plastic anchors) or adhesive, ensuring no displacement during subsequent construction.
If a protective layer (e.g., concrete or drainage board) is required, install it immediately after geotextile placement to avoid UV degradation or mechanical damage.
5. Inspection & Acceptance
Check for proper seams, tight adhesion, and absence of damage.
Conduct water permeability tests if specified to verify anti-seepage performance.
6. Safety & Environmental Measures
Workers must wear protective gear (gloves, masks, etc.).
Dispose of geotextile scraps properly to avoid environmental pollution.
This process ensures effective waterproofing and enhances the tunnel's durability. Adjustments may be needed based on specific project conditions.
Let me know if you'd like any modifications or additional details!
