I. Technical Principles
Uniaxial geogrids utilize oriented polymer molecular alignment to create high-strength grid structures that effectively transfer and disperse stress. Key mechanisms include:
- Stress Dispersion: Rapidly distributes localized loads across wider soil areas, reducing destructive stress concentration.
- Soil Stabilization: Frictional resistance between grid and soil prevents filler subsidence/sliding, enhancing self-stabilization.
- Earth Pressure Reduction: Improves backfill self-stability behind retaining walls, minimizing wall deformation.
II. Construction Procedures
1. Foundation Preparation
- Level and compact subgrade to meet design bearing capacity requirements.
- Pre-excavate trenches for concrete strip foundations along wall alignment.
2. Casting Concrete Strip Foundation
- Pour concrete in pre-dug trenches with panel榫slots.
- Install settlement joints matching wall joint locations.
3. Retaining Wall Construction
- Lay masonry panels on foundation with mortar (dry-stacked horizontally, layered vertically).
- Cut geogrids to designed lengths (integer multiples of longitudinal rib length).
- Align transverse ribs parallel to wall panels, connect ends to wall reinforcements using plastic connectors.
- Tension geogrids until taut, secure free ends with U-shaped steel pins.
- Dump fill materials vertically (≥15cm initial coverage before machinery operation).
- Compact in 20-25cm layers to specified density.
- Repeat until reaching wall top elevation.
III. Critical Specifications
- Site Prep: Compacted, level surface free of protrusions.
- Installation: Wrinkle-free deployment; continuous primary load-bearing direction.
- Fill Material: ≤15cm particle size per design.
- Protection: Backfill within 48 hours post-deployment.
- Drainage: Prevent water accumulation in reinforced zones.
IV. Case Study: Lime-Soil Reinforced Wall
- Materials: Uniaxial HDPE geogrid + 6% lime-content fill.
- Process: Foundation → Geogrid deployment → Layered filling/compaction (20-25cm layers).
- Outcome: 32% higher stability, 28% lower earth pressure, 40% maintenance cost reduction.
V. Conclusion
Uniaxial geogrids significantly enhance wall performance through high tensile strength (100-200MPa) and low elongation (2-5%). Strict adherence to construction protocols ensures optimal load-transfer efficiency and long-term durability.
