Lead:
Special Report- On the recently completed 4,800m-altitude section of G318
Sichuan-Tibet Highway, PET composite geogrid with distinctive green coating
(pictured) has proven critical in solving permafrost settlement. Its vivid
UV-resistant layer bonded to semi-transparent PET grid substrate is shifting
road engineering from passive patching to active fortification.
Core Technical Advantages
1. 3D Reinforcement · 3x Enhanced
Interlocking Capacity
▶ Mechanical Upgrade:
PET substrate achieves 80kN/m biaxial tensile strength (GB/T 3926-2023
highest grade)
Green modified coating boosts filler friction coefficient by 0.8
▶ Engineering Value:
Nagqu Highway Project (Tibet) verification:
41% reduction in subgrade vertical
deformation
95% structural integrity retention after 50 freeze-thaw cycles
2. Weathering Revolution · Zero UV Degradation on Plateaus
▶ Material Breakthrough:
Green coating contains UV stabilizers (Lab test: ≥92% tensile retention after 4,000h QUV aging)
Permafrost Project Case Studies
▶ Qinghai Gongyu Expressway (World's 1st Plateau Permafrost Highway)
Challenge: -3°C annual mean temp / 2.8m seasonal
frost depth
Solution: 3-layer PET geogrid + 0.6m gravel
cushion
Result: <5cm settlement after 7 years (vs.
15cm safety threshold)
▶ China-Russia Gas Pipeline Access Road (Extreme Cold Zone)
Innovation: Serrated-surface coating mechanically
interlocks with frozen soil
Eco-Impact: Reduced 130,000m³ borrowed soil,
preserved 4.5ha alpine meadow