Try to reduce the cutting and sewing amount of Geogrid to avoid waste. During construction in cold season, the geogrid becomes hard and easy to cut hands and wipe knees. Pay attention to safety. Soil has certain compressive and shear strength, and their tensile strength is very high. Laying a certain geogrid in the soil can improve the strength and deformation characteristics of the soil to different degrees. In the reinforced soil technology, the interface effect between the geotechnical composition data and the reinforced soil is one of the main parameters of the reinforced soil. In order to use a certain geotechnical data in a certain kind of soil, it is necessary to study the interface effect characteristics between them. In the process of pulling out the plastic geogrid, in addition to the resistance between the filler soil and the longitudinal reinforcement and the sliding interval of the grid, the normal stress, the external friction between the filler soil and the transverse rib, there is also the resistance of the filler soil to the transverse rib, which is closely related to its composition, density and thickness. The higher the normal stress is, the larger the peak value of the grid drawing force is. When the normal stress is added to a certain period of time, the higher the normal stress is.
Compared with metal textile net and plastic woven net, mining geogrid has the characteristics of light weight, high strength, isotropy, antistatic, corrosion-free and flame-retardant. It is a new type of grid material for underground support engineering and civil engineering.
The geogrid is divided into four categories: plastic geogrid, steel plastic geogrid, glass fiber geogrid and polyester warp knitted polyester geogrid. All technical indexes of geogrid shall meet the design requirements. When laying, the surface of the soil layer shall be flat, and there shall be no hard protrusions such as broken or block stones. The surface of the geogrid shall not be wrinkled during laying, and it shall be tightened manually and fixed on the surface of the filling layer by inserting nails. The steel and plastic grids shall be firmly connected. The strength of the joint in the stress direction shall not be lower than the design tensile strength of the material, and the overlapping length shall not be less than 30cm. The transverse overlapping length shall not be less than 30cm, and the longitudinal reverse overlapping length shall not be less than 50cm. When laying the double layers, the joints of the upper and lower layers shall be staggered with the staggering distance not less than 50cm. After the geogrid is laid, the materials shall be filled in time and strictly controlled For the vehicles transporting the mixture, it is forbidden to turn sharply, brake sharply and pour the mixture feet on the grid layer to prevent damage to the glass fiber grid.
If the geogrid is directly attached to the soft foundation, supplemented by the granular base, it can not only ensure that the granular material and the foundation soil are not mixed, but also the cohesion between the grid and the granular material is further strengthened. The base has tensile strength, so as to improve the bearing capacity of the soft foundation. From the practical application of the two-way geogrid, it can be seen that it has the following characteristics:
(1) due to the mesh effect of the two-way geogrid, the soil particles are squeezed into the grid to form a mechanical occluding effect, thus generating effective stress transfer between the soil and the grid, reducing the uneven settlement.
(2) The two-way geogrid is laid on the soft ground base. The excess water in the foundation can be dissipated through the infiltration of the grid. At the same time, different materials can be prevented from doping each other to ensure the overall stability of the structure.
Two way geogrid has high tensile strength and tensile modulus, which can spread the load or stress evenly in a large area, so as to reduce the load compressive stress on the soft foundation. For the action of non-uniform external force, the mesh will produce corresponding changes, and the non-uniform load will be uniformly transferred, so as to reduce the non-uniform settlement.