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The surface should be smooth and clear of stumps, sharp objects, and debris that could harm the geogrid. Tree stumps need to be cut at ground level. Avoid disturbing any hard crust on the surface that covers weaker soils. In such cases, the geogrid should be installed directly on the unprepared subgrade.
How do you install a geogrid?
To install the geogrid, roll it out smoothly, letting it conform to the ground’s natural contours. The design documents will typically specify the direction and vertical spacing for multiple layers. The geogrid can be placed on the subgrade, either parallel to a road centerline or perpendicular to it.
When should I install Geogrid?
Typically, geogrid is necessary for walls taller than three to four feet. However, if there are steep slopes nearby, loading above the wall, tiered walls, or poor soils, even shorter walls may require geogrid reinforcement.
What is the minimum overlap for Geogrid?
The overlap requirements for geogrid panels, whether placed side by side or end to end, depending on the subgrade strength. For a very soft subgrade (CBR < 1), it is recommended to have a 3 feet overlap. For a soft subgrade (CBR = 1-2), a 2 feet overlap is sufficient. And for a firm subgrade (CBR > 2), a 1-foot overlap is needed.
How deep should Geogrid be?
To construct a retaining wall using geogrid, the length of the geogrid should be 0.8 times the height of the wall. For instance, if the wall is 5 feet tall, you’ll need geogrid layers that are 4 feet long. In the case of small block walls, the geogrid is usually installed every second layer of blocks, starting from the top of the bottom block.
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