A Method of Strengthening Highway Subgrade Using Geogrid

Abstract

The invention relates to a geotechnical grid used for highway subgrade reinforcement and its application method. The grid net is made of high-strength and high-modulus polyvinyl chloride polymer vertically and horizontally to enhance the tensile strength of the ribs; the outer layer of the grid is covered with Modified rubber coating, the rubber is mixed with anti-aging agent, antioxidant and light shielding agent and other masterbatches; the surface layer of the grid longitudinal and transverse ribs has circular embossed threads, and the grid mesh is circular to reduce stress concentration , to enhance the extensibility of the ribs; there are double-sided "strengthening columns" at the joints of the grid ribs to prevent the sliding between the soil and the grid, enhance the shear performance of the subgrade, balance the settlement, and prevent the grid from being pulled out of the subgrade. The invention has the advantages of high strength of polymer material, external coating of modified rubber, small creep, high tensile strength and low tensile strain; the circular mesh, tendon thread and "reinforcing column" are fully occluded with the soil, A space composite strengthening structure is formed, which improves the overall shear strength of the subgrade and the performance of balanced settlement.

Description

technical field [0001] The invention relates to a geotechnical grid capable of increasing the strength of road subgrade and making the subgrade settle in a balanced manner and a using method thereof, belonging to the technical field of civil engineering. Background technique [0002] In the construction of highway subgrade, slope protection, and dam engineering, the method of adding geosynthetics to the soil is often used, such as geogrid. Through the embedded anchorage of the grid and the soil block and the friction between the grid and the soil, the strength of the soil can be enhanced and the purpose of balanced settlement can be achieved, especially widely used in road subgrades. High-strength polymer geogrids equipped with longitudinal and transverse ribs and hole structures are applied to civil engineering such as highway and railway subgrades, slope anti-seepage and landslides, and river embankment revetment, which increases the life of the project. At present, geogr...

AI Technical Summary

Problems solved by technology

Plastic geogrid has simple process and low cost, but it will show serious creep after long-term use, resulting in the degradation of structural stability

Fabric geogrid has good performance and strong creep resistance, but the process is cumbersome and expensive

At present, the main problem of geogrid used in road embankment is: the horizontally arranged grid is easy to move horizontally in the soil, and cannot effectively reinforce the soil. After the road has been in operation for a long time, it is not the grid that is broken. That is, the grille is pulled out of the subgrade, causing secondary damage to the slope protection

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