Waterproofing & Leak Sealing
Stops infiltration in tunnel liners and joints
solutionstunnel liner sealing
Tunnel Liner Sealing
What is Tunnel Liner Sealing?
Tunnel liner sealing restores watertight performance in underground transit, utility, and drainage tunnels by blocking groundwater infiltration and stabilizing soils. Using trenchless polymer injection, cracks, joints, and liner interfaces are sealed without disrupting tunnel operations.
Problems Solved
- Groundwater infiltration through tunnel liners and joints
- Soil erosion and voids forming around tunnel structures
- Hydrostatic pressure weakening tunnel walls
- Settlement or misalignment from water migration
- High repair costs from excavation-based tunnel rehabilitation
Types of Polymers Used
High-Density Polyurethane Foams
- Expands to densify and stabilize loose backfill soils
- Provides lightweight reinforcement without added soil pressure
- Cures rapidly to minimize operational disruption
Structural Polyurethane Resins
- Creates rigid reinforcement zones behind walls and utilities
- Transfers structural loads to stable ground layers
- Extends service life of supported structures
Hydro-Insensitive Polymers
- Expands and cures in wet or groundwater conditions
- Seals voids and prevents erosion in saturated soils
- Provides long-term durability in challenging sites
Benefits of Tunnel Liner Sealing
Tunnel liner sealing with polymer injection prevents leaks, reinforces soils, and restores watertight integrity in underground structures. These trenchless solutions reduce maintenance costs and extend tunnel service life.
Watertight Protection for Transit and Utility Tunnels
- Stops groundwater infiltration in tunnels
- Reinforces soils and prevents erosion around liners
- Provides trenchless sealing without excavation
- Extends long-term durability of tunnel systems
Key Applications
Transit Tunnels
Seals leaks and restores watertight performance in subway and rail systems
Utility Tunnels
Blocks infiltration around pipelines and conduits in underground utilities
Stormwater Tunnels
Seals leaks and stabilizes soils in large drainage systems
Cut-and-Cover Tunnels
Restores watertight integrity in shallow tunnel structures
Mining Tunnels
Protects underground shafts and passages from groundwater infiltration
Transportation Corridors
Reinforces tunnel systems supporting highways and rail networks
Services
Tunnel liner sealing is supported by these services:
Soil Stabilization
Soil Stabilization
Strengthens soils undermined by water migration
Void Filling
Void Filling
Eliminates cavities forming behind tunnel walls
Chemical Grouting
Chemical Grouting
Seals seepage paths and densifies soils under hydrostatic pressure
Structural Reinforcement
Structural Reinforcement
Provides durable support for tunnel structures
Curtain Grouting
Curtain Grouting
Creates external watertight barriers to block groundwater migration around tunnels
How the Process Works
1
Investigation
Tunnels inspected for leaks, voids, or liner defects
2
Planning
Injection design developed for cracks, joints, and hydrostatic conditions
3
Access
Small-diameter injection ports installed with minimal disruption
4
Injection
Expanding polymers seal leaks and reinforce soils behind liners
5
Monitoring
Placement tracked in real time to ensure watertight coverage
6
Validation
Final inspection confirms restored tunnel watertightness
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