The highway is one of the important structural organizations in the highway system. Under the effect of the variable stress of the transportation vehicles, the local area of the base layer is subject to large stresses and strains. Due to the local regional stress changes for a long time, the base layer begins to settle, displace, Cracking and other phenomena. Due to the change of the base layer, irregular curvature changes occur on the pavement, causing cracks and wrinkles to appear on the pavement. Therefore, the enhancement of the base layer is very important. The specially treated glass fiber grid can greatly improve the overall strength of the base layer, and its effect is similar to that of reinforced concrete.
The role of glass fiber grids in subgrades is mainly manifested in
1. Reduce the large amount of subsidence of the filling soil during the construction period and save earthwork.
2. Improve the stability of the subgrade geotextile.
3. The vertical deformation of the upper filler is diffused horizontally through the glass fiber grid, so that the shear deformation resistance of the upper filler is fully exerted, which greatly enhances the load-bearing area of the surface of the soft ground and greatly reduces the surface pressure. Enhance the strength of the foundation and increase the bearing capacity of the foundation.
4. Because of its flexibility and high elastic modulus, it can effectively absorb the energy transmitted by vibration, so it has good shock resistance.
5. Adjust uneven settlement:
① The tensile stress of the glass fiber grid reduces the vertical stress of the soil below the interface, thereby reducing the vertical compression deformation of the soil.
② Deformation of the glass fiber grid due to pre-tensioning and differential settlement. This tensile stress is balanced by interfacial shear stress. Interfacial shear stress causes a certain degree of uplift deformation in the settlement area of the foundation, and this uplift deformation partially offsets the settlement of the foundation or roadbed.