Basalt fiber geogrids are high-performance geosynthetic materials made from basalt fibers as raw materials and are made through specific processes. It combines the high strength, high temperature resistance and corrosion resistance of basalt fibers, and is widely used in roads, railways, water conservancy, geotechnical engineering and other fields. Its main uses are as follows:
1. Road and railway engineering
1. Roadbed reinforcement
Function: Paid in the roadbed filler, and through the high tensile strength (≥1200MPa) and rigidity of the basalt fibers, the lateral displacement and uneven settlement of the roadbed soil are limited, and the overall stability of the roadbed is improved.
Application scenarios:
High-fill roadbed and soft soil foundation treatment (such as highway and railway roadbed).
The splicing of new and old roadbeds reduces pavement cracks caused by differential settlement.
2. Pavement resistance
Function: Paved under asphalt pavement or cement concrete base layer, dispersing the stress generated by wheel loads, and inhibiting the expansion of reflective cracks (such as temperature shrinkage cracks, load cracks).
Advantages:
High temperature resistance (short-term temperature resistance up to 600℃), suitable for high temperature environments for asphalt paving to avoid material softening and failure.
High elastic modulus (≥90GPa), effectively transmit and disperse loads, and extend the service life of the road surface.
3. Steep slopes and slope reinforcement
Function: used for reinforcement protection of road slopes or railway embankments, enhance the anti-slip stability of slope soil, and prevent landslides, collapse and other disasters.
Typical applications: ecological protection projects for road slopes and railway subgrade slopes in mountainous areas (can be combined with vegetation planting).
2. Water Conservancy and Geotechnical Engineering
1. Enhanced anti-seepage of dams and channels
Function: Paid in the dam body or channel foundation to improve the shear strength of the soil and prevent the risk of dam body settlement or dam collapse caused by leakage.
Scenario: Reinforcement and seepage prevention of reservoir embankments, irrigation channels, and river channel improvement projects.
2. Reinforcement of retaining walls and abutments
Function: It is used as a reinforced material for soil filling behind gravity retaining walls or abutments, reducing the pressure on the side of the soil, and improving the structure's seismic performance and durability.
Advantages: Corrosion-resistant (acid-base, salt spray resistance), suitable for water conservancy projects in coastal or highly salted soil areas.
3. Stability of tailings dams and slag landfills
Function: lay grilles in layered filling of tailings dams or landfills to enhance the integrity of loose accumulations, inhibit settlement and crack development, and ensure project safety.
3. Special environmental engineering
1. High temperature area application
Scenario: In high-temperature environments such as industrial waste slag accumulation sites and thermal pipelines, the high-temperature resistance of basalt fibers can prevent the material from failing due to high temperature.
2. Corrosive environmental engineering
Scenario: In chemical parks, landfills and other strong corrosion areas, the grille's chemical corrosion resistance is better than traditional steel-plastic or plastic grilles, extending the service life of the project.
3. Ecological Engineering
Function: used for mining re-greening and slope vegetation solidification. The high strength and flexibility of the grille can fix the topsoil, and at the same time provide climbing support for the plant roots to achieve the combination of ecological protection and engineering reinforcement.
4. Comparison with other geogrids
Type Basalt fiber geogrid Steel-plastic grille Plastic grille
Tensile strength 1200-2000N/m (single pull) 80-150kN/m 30-100kN/m
Temperature resistance: Excellent (resistant to 600℃ for short-term high temperature) Medium (resistant to 100-150℃) Poor (easy to high temperature deformation)
Corrosion resistance: Excellent (resistance to acid and alkali, salt spray) Medium (steel wire is prone to rust) Good (plastics are corrosion-resistant but have low strength)
Elastic modulus ≥90GPa 20-30GPa 10-20GPa
Applicable scenarios High temperature, high stress, corrosion environment Conventional roadbed, low corrosion environment Light roadbed, temporary engineering
5. Key points of design and construction
Laying direction:
The main stress direction is consistent with the maximum stress direction of the project (such as the road lateral or longitudinal).
Lap and fix:
The overlap length is ≥20cm and is fixed with U-shaped nails or special connectors to avoid dislocation of the grille.
Backfill materials:
The particle size of the upper and lower layers of the grille is ≤3cm to avoid sharp particles from punctured by the grille.
Construction machinery:
Avoid heavy machinery to directly roll the grille, and light equipment (such as vibration rollers) are used for initial rolling.