Basic situation of three-way polypropylene punching and stretching geogrid

1. Basic situation of three-way polypropylene punching and stretching geogrid

（1) Definition and production process

Three-way polypropylene punching tensile geogrid is a new type of geotechnical reinforcement material developed and improved on the basis of uniaxial tensile geogrid and biaxial tensile geogrid. The production process is that polypropylene is used as the main raw material, through extrusion, plate forming and punching processes, and then longitudinal and transverse stretching, and z Directional stretching, which is formed by adding one direction stretching to the three-dimensional direction.

（2) Structural characteristics

1. Unique triangular structure

• This structure is stable, has more reasonable stability than unidirectional grids and bidirectional grids, and can bear multi-directional loads at the same time, thus dispersing loads more effectively.

• Tensile characteristics in three-dimensional directions

• It has a strong tensile effect in the three-dimensional direction, which makes it well realize the effect of preventing and controlling soil erosion in different directions. It has great tensile strength not only in the longitudinal and transverse directions, but also can increase friction when it is completely in contact with the subgrade and prevent soil erosion of the subgrade.

2. Performance advantages of three-way polypropylene punching and tensile geogrid

（1) Mechanical properties

1. High tensile strength

• The product itself has large tensile strength, can adapt to the stress requirements in a variety of engineering environments, and can be used for the reinforcement of engineering parts that need to bear large tensile forces, such as various dams and subgrades.

• High stability

• Because of its unique three-way structure, it can provide an ideal interlocking system of more effective force bearing and diffusion in soil, which can adapt to the reinforcement of large-area permanent bearing foundation and effectively enhance the stability of foundation. For example, it plays an important role in highway and railway subgrade reinforcement and reinforced retaining wall engineering 34。

（2) Durability

1. Long service life

• The material has high durability, is not easy to damage during long-term use, can reduce maintenance costs during use, and is suitable for projects with high durability requirements, such as large airports, parking lots, etc. 。

• Better corrosion resistance

• Polypropylene material itself has certain anti-corrosion ability, which can maintain stable performance under different soil and environmental conditions, and reduce the risk of material performance degradation caused by corrosion.

（3) Other advantages

1. Lightweight

• It is lighter, can replace the heavy metal mesh, is convenient for transportation and installation in the construction process, can improve the construction efficiency, reduce the construction difficulty and cost, for example, when it can be used as protective support, false roof, etc. in underground mining in coal mines, the lighter weight is convenient for operation 。

• High cost performance

• It has low cost and high cost performance among many geosynthetic products. It can effectively control engineering costs while meeting engineering needs. Therefore, it is very popular with the public and has a wide range of applications, including but not limited to various dams, subgrades, and slopes. Protection, airports, parking lots and other projects.