Geogrid is a major geosynthetic material. Compared with other geosynthetics, it has unique performance and efficacy. Geogrids are often used as reinforcements for reinforced soil structures or composites. Geogrids are divided into two types: glass fiber and polyester fiber.

　　 (1) Plastics

　　 This type of geogrid is a square or rectangular polymer mesh formed by stretching. According to the different stretching directions when it is manufactured, it can be divided into two types: unidirectional stretching and bidirectional stretching. It punches holes on the polymer sheet (mostly polypropylene or high-density polyethylene) produced by extrusion, and then performs directional stretching under heating. The unidirectional stretch grid is only stretched along the length of the sheet, while the biaxial stretch grid is made by continuing to stretch the unidirectional stretched grid in the direction perpendicular to its length.

　　Because the polymers of the geogrid will be rearranged and oriented during the heating and extension process, the bonding force between the molecular chains is strengthened and the strength is improved. Its elongation is only 10% to 15% of the original sheet. If anti-aging materials such as carbon black are added to the geogrid, it can have better durability such as acid resistance, alkali resistance, corrosion resistance and aging resistance.

　　 (2) Glass fiber

　　 This type of geogrid is made of high-strength glass fiber, sometimes combined with self-adhesive pressure sensitive adhesive and surface asphalt dipping treatment, so that the grid and asphalt pavement are closely integrated into one. As the interlocking force of the earth and rock materials in the geogrid grid increases, the friction coefficient between them increases significantly (up to 0.8～10). The pull-out resistance of the geogrid buried in the soil is due to the grid The frictional bite force between the soil and the soil is strong and increases significantly, so it is a good reinforcement material.

　　 At the same time, the geogrid is a light-weight, flexible flat mesh material, which is easy to cut and connect on site, and can also be overlapped and overlapped. It is easy to construct and does not require special construction machinery and professional technicians.