Unidirectional geogrid is shaped by stretching in one direction and has thin rectangular mesh. Bidirectional geogrid is made by stretching in two directions. It is of net?structure with square mesh. The structure of unidirectional geogrid has really high tensile strength and tensile modulus that the strength of extension reaches 100 to 200Mpa. It is close to the level of mild steel and much better than the traditional or existing reinforced materials. 1) Bidirectional geogrid can increase the bearing capacity and the service life of the roadbed (foundation). It can take the place of metal net and be used as the top mesh in the mine.
Unidirectional geogrid is made of a kind of reticulate compound material. To produce it, the raw materials are required to be extruded with punched holes and heated for shaping. It can be divided into two categories according to material, namely the unidirectional polypropylene geogrid and unidirectional polyethylene geogrid. The material is characterized by really high tensile strength and tensile modulus along the stretching direction. It provides ideal interlock system for the soil with low extension rate. At present, it is the most ideal reinforced material. Bidirectional plastic geogrid is fit to reinforce the roadbed, tunnel wall, parking lot, airport, wharf and others that have permanent bases. It can take the place of metal gauze to be used as the top mesh in the mine. At the same time, it can support the plants on the ground and stabilize the afforestation. It can be used on the soil slope to prevent it from water loss and soil erosion. It is time saving, labor saving and is easy to install. It can reduce the maintenance frequency ofpavement, efficiently prevent the road from collapse and crazing, provide it with permanent landscaping and increase the bearing capacity and service life of roadbed.
The sprawling chain-like molecules can be reoriented to be in a linear shape by stretching which increases the strength of extension and rigidity of geogrid. When laid in the soil, the geogrid can form an efficient stress transfer structure through the occlusion and interlocking of its meshes and the soil, transferring the local stress to other parts of soil quickly and efficiently. It reduces the local breakdown stress and increases the service life. 1) Bidirectional geogrid can increase the bearing capacity and the service life of the roadbed (foundation). 2) Bidirectional geogrid is usually used to prevent roadbed (foundation) from collapsing or cracking and keep the ground clean and tidy. 3) Bidirectional geogrid is easy to install. It is time saving, labor saving with shorter construction time and lower maintenance cost. 4) Bidirectional geogrid can prevent culvert from cracking. 5) Bidirectional geogid is usually used to reinforce the soil slope and prevent the slope from water loss and soil erosion.
