Geogrid is a major geosynthetic material, which is often used as reinforcement for reinforced soil structures or composite materials. In recent years, in order to increase the strength of the foundation, a large number of geogrids have been used in the construction of highway subgrades, and the geogrids have been laid during the construction of the sand cushion to form a reinforced sand cushion.
1. Uneven subsidence. If the settlement is slightly uneven and the base course and soil foundation are relatively dense and stable, only the surface course can be repaired, filled with asphalt sand or fine-grained asphalt mixture, leveled, compacted, and the area should be added when the area is large. Pavement layer.
2. The sinking of potholes, trenches, etc. occurred locally due to excessive rain. Use crushed (gravel) stones, dry masonry or mortar-laying rubble, etc., to re-fill and compact, and then pave the surface layer after the soil foundation and base layer are solved.
3. Large areas of water on the road surface, subsidence due to false filling. The base layer should be added, compacted again, and then surface layered.
4. Subsidence caused by soil erosion caused by excessive water content of the roadbed should be backfilled after it is dry, and isolated with geogrid and geomembrane after compaction. Prevent the rain from causing the same problem next time.
The engineering practice proved that the grid sand cushion layer added to the geogrid indeed enhances the stability of the foundation. The geogrid sand cushion can effectively reduce the settlement and deformation of the embankment. The geogrid cushion has a certain degree of effect on the homogenization of the base pressure.