Geogrid reinforcement for platforms, roads and slopes
Geogrids are polymer grids with open apertures that interlock with compacted granular fill. Placed within or beneath a fill layer, they reinforce it by restraining lateral movement of the aggregate and increasing stiffness and bearing capacity.
Suitable ground conditions and applications
Can be considered where…
- Base and subgrade stabilisation for roads, platforms and laydown areas.
- Working platforms for cranes and piling rigs.
- Reinforced soil slopes and walls.
- Basal reinforcement of embankments over soft ground.
Limitations
- Performance depends on the product, the match between aperture size and aggregate, and correct installation.
- Geogrid does not remove settlement of deep soft layers.
- Design follows product data and recognised design methods.
Suitability is confirmed from the site investigation and the performance requirement.
How it works
The geogrid is laid on the prepared surface or between fill layers. As the fill is compacted, aggregate particles lock into the apertures.
This interlock restrains the aggregate from spreading sideways under load, so the reinforced layer is stiffer and spreads load more widely. In slopes and walls, layers of geogrid carry tension and hold the reinforced soil block together.
Design inputs
- Subgrade strength.
- Loads and design life.
- Geogrid type (uniaxial for walls and slopes, biaxial or multiaxial for base stabilisation) and its properties.
- Fill specification.
- Design method and standard.
Trial and calibration
- Trial area with the specified product and fill.
- Plate load test to confirm performance.
Execution controls
- Orientation, overlaps and anchorage of the geogrid.
- Fill lift thickness and compaction.
- No trafficking directly on the geogrid.
- Installation records.
Verification and acceptance
Design intent, production control and acceptance verification are kept separate, so it is always clear what was required, what was done and what was proven.
What is required
Bearing, stiffness or stability criteria agreed with the consultant.
What was done
Records of installation, fill and compaction.
What was proven
Density tests, plate load tests and level checks.
Deliverables
- Method statement
- Layout drawings
- Product data and certificates
- Installation records
- Test reports
Common questions
What does a geogrid do?
It interlocks with compacted aggregate and restrains it from spreading sideways, which increases the stiffness and bearing capacity of the layer.
Where is the geogrid placed?
At the base of, or within, the granular layer as the design requires. Reinforced slopes and walls use several layers.
Does the type of aggregate matter?
Yes. The aperture size of the geogrid must suit the particle size of the aggregate for interlock to develop.
Discuss whether Geogrid fits your ground conditions.
Share the site location, the investigation report and the performance requirement.