Bidirectional plastic geogrid is a bidirectional mesh geosynthetic material made of polymer (polypropylene or polyethylene) through extrusion, stretching and other processes. It has the characteristics of high bidirectional tensile strength, light weight, corrosion resistance, and convenient construction. It is widely used in various geotechnical engineering. The following are its core uses and typical scenarios:
1. Road engineering: roadbed reinforcement and road crack prevention
1. Roadbed reinforcement and stability improvement
Principle of action:
The bidirectional tensile properties of the grille (teny strength is usually 15-50kN/m) can evenly disperse the roadbed load, enhance the integrity of the soil, and suppress deformation caused by vehicle load or uneven settlement of the foundation.
Application scenarios:
New road subgrade: Paved in the road subgrade filler layer (such as fill sections), improve bearing capacity, and reduce settlement (especially suitable for poor geology such as soft soil and wet loess).
Old road widening and splicing: lay grilles at the junction of new and old roadbeds to coordinate differential settlement to prevent cracking of splicing seams.
2. Anti-cracking and reflective crack suppression on pavement
Principle of action:
The grid structure of the grille can absorb stress concentration on the pavement base layer and prevent the base layer from reflecting upwards to the asphalt or concrete surface layer.
Application scenarios:
Asphalt pavement base: lay grates between semi-rigid base layer (such as cement-stabilized gravel) and asphalt surface layer to extend the service life of the pavement.
Concrete pavement renovation: Before laying new surfaces on the old concrete pavement, laying grilles to reduce reflective cracks.
2. Water conservancy engineering: dam reinforcement and anti-seepage assistance
1. Ripening of dam and channel foundation
Principle of action:
The grille enhances the shear strength of the soil in the foundation of the dam through bidirectional tensioning, preventing landslides or collapses caused by osmosis pressure or load.
Application scenarios:
Earth and rock dam foundation treatment: lay at the base of the dam base to improve the stability of the dam body (such as clay core wall dam and rock pile dam).
Irrigation channel reinforcement: Reinforce under the channel slope or bottom plate to prevent soil deformation caused by water flow erosion, and assist in the stability of the anti-seepage layer (such as concrete lining).
2. River slope protection
Principle of action:
The grille combines with vegetation (such as spray-sowed grass seeds) to form a "reinforced-vegetation" composite protective layer, which not only strengthens the slope but also prevents soil erosion.
Application scenarios:
River channel improvement project: After laying grilles on the river bank slopes, soil and grass are planted, which is suitable for ecological slope protection (such as gentle slopes and corrosive river channels).
3. Railway engineering: strengthening of rail foundations
1. Roadbed and roadbed reinforcement
Principle of action:
The grille constrains the displacement of the gravel on the roadbed in both directions, reduces the impact of train load on the roadbed, and reduces the risk of roadbed settlement and sludge turning.
Application scenarios:
Ordinary railway and high-speed railway subgrade: paved below the roadbed or the surface of the base bed to improve track smoothness (such as high-speed railways with speeds of ≥200km/h).
Station and cargo yard ground: The heavy train parking area is reinforced to prevent the ground from sinking.
4. Geotechnical engineering: reinforcement of slopes and retaining walls
1. Shallow slope reinforcement
Principle of action:
The grille is laid in shallow soil on the slope, and the soil displacement is restrained by bidirectional friction to prevent small-scale collapse or surface peeling.
Application scenarios:
Highway/rail slope: ecological protection of soil or weathered rock slopes (slope rate ≤1:1.5), better use with anchor rods or soil nails.
Temporary reinforcement of foundation pit slope: lay grilles during foundation pit excavation to enhance temporary stability of the slope.
2. Reinforced earth retaining wall
Principle of action:
As a stretching material and soil fill, it works together to form a "soil wall composite" to resist the pressure on the soil side and reduce the size of the retaining wall structure.
Application scenarios:
Municipal engineering retaining wall: Upright or inclined retaining walls on both sides of urban roads and bridges, especially suitable for construction in narrow spaces.
5. Mine and tailings treatment: site stability and pollution control
1. Reinforcement of tailings dam
Principle of action:
The grille enhances the integrity of tailings accumulation and prevents dam body cracking or dam collapse caused by tailings self-weight or earthquake.
Application scenarios:
Metal ore and coal mine tailings ponds: stratified reinforcement of initial dams or accumulation dams to improve the anti-slip stability of the dam body.
2. Hardening of mine roads and sites
Principle of action:
Lay grilles below the temporary mine roads or material stacking sites to reduce ground damage caused by heavy machinery crushing.
Application scenarios:
Open-pit mine transportation roads: replace some concrete hardened layers, reduce costs and facilitate repair.