1. Research Background
The leakage of railway tunnels has long been a critical issue, causing problems such as lining corrosion, safety hazards for train operations, equipment damage, and even ground collapse (e.g., cases in Sichuan Karst areas).
Traditional waterproofing methods face significant challenges:
- Water channeling occurs when the waterproof membrane is damaged in composite linings, relying heavily on secondary linings
- Welding defects and punctures during construction are common problems
Technological innovation: A shift from "raincoat-style waterproofing" to "skin-style waterproofing" concept, supported by China Academy of Railway Sciences research projects (2014YJ064, 2015G002-F)
2. Experimental Research on Reactive Adhesive Waterproofing Membrane
Structure and Principle
Three-layer structure: EVA base layer + non-bituminous polymer self-adhesive layer + anti-stick coating
Design principle: The plastic gel buffer layer resists impact, while the reactive adhesive layer forms a chemical bond with concrete
Performance Parameters
Base Material and Overall Performance Parameters
| Property |
Standard Requirement |
Test Result |
| Tensile Strength at Break |
≥18 MPa |
23.8 MPa (transverse) |
| Elongation at Break |
≥650% |
713% (transverse) |
| Water Channeling Resistance |
No channeling at 0.6 MPa |
Passed |
| Peel Strength with Concrete |
≥2.5 N/mm |
3.39 N/mm (untreated) |
3. Field Tests
Simulated vault test: No leakage at 0.3 MPa water pressure, bond failure at 1.2 MPa
Water injection test: No leakage at 0.6 MPa for 20 minutes, verifying water channeling resistance
Core sampling: Intact bond interface with no water channels
4. Construction Technology
Key Process Points
- Pre-laid reactive adhesive method: The anti-stick coating reacts with concrete hydration to form an integral structure
- Hot air welding lap joint: Double seams of 1.5 cm, temperature 150-250°C to avoid burn-through
- Damage repair: Self-adhesive patches for quick and reliable sealing
- Finished product protection: Cover with non-woven fabric to prevent punctures from steel bars
Construction in Cut-and-Cover and Drill-and-Blast Tunnels
Drill-and-blast tunnels: Fixed with hot-melt gaskets, direct penetration fixing with nails possible
Cut-and-cover tunnels: Loose-laid on底板 and fixed on side walls, e.g., Wuchang Riverside Underground Loop Project
Membrane Installation Diagram
5. Application Cases
Over 5 million square meters applied in various railway projects:
- Beijing-Shenyang High-Speed Railway: Shijiagou Tunnel (30,000 m²), Lihuading Tunnel (50,000 m²)
- Shangqiu-Hefei-Hangzhou High-Speed Railway: Chaohu Tunnel (10,000 m²)
- Lvliangshan Tunnel Emergency Repair: 130,000 m²
- Guangzhou-Zhanjiang High-Speed Railway: 1.2 million m²
User feedback: 30% improvement in construction efficiency and significantly enhanced waterproofing reliability
6. Comparative Analysis
vs Traditional Waterproofing Membranes
Structure and Construction Comparison
| Property |
Reactive Adhesive Membrane |
Traditional Membrane |
| Structure |
Three-layer composite |
Single-layer base material |
| Adhesion |
Chemical bonding, water channeling resistance |
Reliant on welding, prone to water channeling |
| Repair Method |
Self-adhesive patches, quick and reliable |
Welding repair, prone to missed spots |
vs Conventional Polymer Waterproofing Membranes
Performance Parameter Comparison
| Property |
Reactive Adhesive Membrane |
Conventional Membrane |
| Elongation at Break |
≥650% |
≥400% |
| Peel Strength After Contamination |
≥2.0 N/mm |
≥1.0 N/mm |
7. Key Technical Features
- Modified EVA base material: High strength + flexibility for easy installation and tight adhesion
- Cold weather construction capability: Reduced risk of burn-through, improved work efficiency
- Contamination resistance: Dust/oil does not affect bonding performance
- Included in China Railway Corporation standard: Q/CR 562.1-2018
8. Hubei Yujing Technology Co., Ltd. Qualifications
Annual production capacity of 5 million square meters with automated production lines, certified with CRCC, ISO 9001/14001/45001
Railway Product Certification
Certificate No.: CRCC10221P13440R0S-001
Product: Reactive Adhesive Waterproofing Membrane
Test Report
Tested by China Academy of Railway Sciences: All parameters meet standards
Puncture resistance: 410 N (standard ≥300 N)
Patent license: Technology licensed from China Academy of Railway Sciences (Patent No. ZL201611112890.0)
