Tiếng Việt
1. Project Context & Challenges
The Lang Van Ecotourism Resort Project (Da Nang City) is located at the foot of Hai Van Pass, an area characterized by steep mountainous terrain and exposed to the heavy rainfall and storms of Central Vietnam.
During construction, slope protection is essential to limit soil loss caused by surface runoff, prevent erosion, and protect the infrastructure below. The solution must also retain the soil cover to support grass establishment and restore the green landscape in line with the project’s ecotourism orientation.
To meet these requirements, Vinanpha, the contractor directly responsible for the slope reinforcement works, installed geocells supplied by APT, forming a system that confines infill material and protects the slope surface.
Key Geotechnical Challenges
- Steep Slopes & High Risk of Slope Failure: The terrain around the pass features steep gradients. During prolonged heavy rainfall, increased surface runoff velocity can cause deep erosion, soil washout, and failure of the entire surface soil layer.
- Difficulty Maintaining Soil Cover: With conventional revegetation methods, topsoil can be washed away before plant roots become sufficiently established to retain the soil.
- Demanding Construction Schedule & Large Material Quantities: The slope reinforcement works required a substantial quantity of geosynthetic materials. APT supplied a total of 33,500 m² of geocells for the project.
2. Slope Reinforcement Using APT Geocells
On the slopes at Lang Van, APT Geocell 445–100 is expanded into a three-dimensional cellular confinement system and secured to the slope surface. The cells contain infill material, helping retain the soil cover, limit washout, and support vegetation establishment.
Characteristics of APT Geocell 445–100
- 100% Virgin HDPE: The product consists of continuous high-density polyethylene strips securely joined by ultrasonic welding. It is resistant to chemical and biological agents in soil, UV-resistant, and offers very high tensile strength.
- 445–100 Dimensions:
- Weld spacing: 445 mm.
- Cell height: 100 mm.
Benefits of Geocells
- Soil Confinement & Reduced Runoff Velocity: When expanded and secured on the slope, geocells form a robust three-dimensional honeycomb structure, completely preventing downslope sliding and erosion.
- Load Distribution & Increased Bearing Capacity: Loads generated by runoff or external forces are distributed across the entire cellular system, reducing localized stress concentrations.
3. Slope Installation Works
- Slope Surface Preparation: Grade the slope, remove debris and large rocks, and compact the surface in accordance with the design requirements.
- Geocell Expansion and Anchoring: Expand the APT 445–100 geocell panels on the slope. Use formed steel anchor pins and the anchoring system specified in the design to secure the panels, ensuring that the cells are uniformly expanded and remain in close contact with the surface.
- Panel Connection: Connect adjacent geocell panels using connecting accessories in accordance with the technical requirements, forming a continuous cellular confinement system.
- Infilling and Revegetation: Fill the cells with the material specified in the design. In areas requiring revegetation, use suitable soil for seeding or grass planting to establish vegetation cover on the slope.
4. Comparison of Geocells and Conventional Methods
| Criterion | Concrete Slope Protection / Shotcrete | APT Geocell 445–100 |
|---|---|---|
| Aesthetics & Environment | Rigid appearance, inhibits vegetation growth, and is susceptible to cracking over time. | Environmentally friendly, allowing grass to be established on the slope. |
| Drainage & Water Pressure | Restricts natural drainage and may cause a buildup of groundwater pressure. | Superior drainage through perforations in the cell walls. |
| Construction Time & Cost | High costs associated with formwork, concrete, and transporting heavy equipment onto slopes. | Very rapid installation; lightweight and compact when collapsed, making transportation to mountainous terrain easier. |
| Deformation Accommodation | Rigid structure susceptible to cracking when the underlying soil undergoes differential settlement. | Flexible structure that accommodates slope deformation |
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