Geogrid is a major geosynthetics. Compared with other geosynthetics, it has a unique performance and effectiveness. Geogrid is usually used as the reinforced soil structure tendon material or composite material geosynthetics. The geogrid is divided into plastic geogrid, steel plastic geogrid, glass fiber geogrid and fiberglass polyester geogrid. (1) The plastic geogrid is Polymer netting materials with a square or rectangular shape after pultrusion. According to the direction of pultrusion, it can be divided into uniaxial?tension and two-way stretch. It is punched in the polymer sheet material (raw material is polypropylene or high density polyethylene) after pultrusion, and then operate orientation stretching in heating codition. The aniaxial tension geogrids is made only along the length direction of the sheet, while the two-way stretching gridgeogrids is made by pultrusion the aniaxial tension geogrids along the direction which is vertical to the length.
