Geogrid reinforcement technology

1 Characteristics of geogrid reinforcement technology

In the current highway construction applications, the geosynthetic materials used are usually geogrids, which are particularly common in highway roadbed widening construction applications. Since the joint between the old and new highways is prone to uneven settlement and deformation after the highway roadbed is widened, conventional geogrids or steel-plastic geogrids with two-way stress effects are selected for construction to form a complete geogrid. Reinforced soil structural system improves the engineering properties of roadbed soil.

In the application of highway roadbed widening construction, the main functions of geogrid reinforcement technology can be divided into isolation function, anti-seepage function, reinforcement function, drainage function and filtering function. Among them, one of the most basic and important functions during the construction process of highway subgrade geogrid reinforcement is the reinforcing function. The raw materials used have excellent tensile properties, which can effectively enhance the tensile properties of the soil and at the same time improve its plasticity. . In addition, geogrid reinforced synthetic materials can isolate stones of different particle sizes from the highway subgrade to avoid mixing between soil and geotechnical materials; when there are some pollutants or debris and sewage on the highway construction surface, Composite geogrids or geomembranes can effectively block debris and prevent pollutants from eroding the roadbed soil. At the same time, they can have a filtering effect between different soil layers, diluting and filtering out polluting or toxic liquids. . In addition, combined with the good bending characteristics of geosynthetic materials, natural geotechnical drainage pipes can be formed to drain rainwater in a timely manner.

2 Construction principles of geogrid reinforcement technology

The main raw materials of geogrids used in highway construction are polymers, including fiberglass, plastic, fiberglass polyester, steel plastic, etc. Stable square grid plates are obtained through special stretching and rolling. , which can play a role in bearing larger tensile stress in practical applications in highway engineering. In areas with typical expansion and contraction deformation of highway soil, the use of geogrid technology can effectively transfer the tensile stress of the soil. With steel bars as tensile components, an appropriate amount of tension will be generated between the geogrid and the roadbed soil under the action of external loads. The friction force controls the lateral displacement and deformation of the soil. In addition, due to the good bonding force between the geogrid and the soil, the tensile properties and shear stress of the overall structure can be formed. To sum up, during the highway roadbed widening construction, the problem of uneven settlement and deformation of the roadbed can be improved by using geogrid reinforcement technology to resist the occurrence and development of highway cracks, which can effectively improve the quality of the highway roadbed soil. Load carrying capacity and stability.

Geosynthetic material is a new type of engineering material. At present, geosynthetics can be mainly divided into four categories: Geotextiles, geomembranes, composite geosynthetics and special geosynthetics. As a geosynthetic material with special engineering properties, geogrid has good load-bearing capacity and stability. It is currently used in highway engineering projects to reinforce embankments, soft foundations, and retaining wall structures.