Subgrade Reinforcement Geotextile

Subgrade Reinforcement Geotextile

1. Product Overview

Subgrade reinforcement geotextile is a high-strength needle-punched nonwoven geosynthetic made of polyester filament or staple fiber. It is specially designed for highway, municipal road, railway and soft foundation treatment. By laying between subgrade and base course, it improves the overall bearing capacity of road foundation, solves soft soil settlement, lateral deformation and road collapse problems, and extends the service life of road engineering.

2. Core Functions

(1) Reinforcement & Load Distribution

The high tensile strength of geotextile disperses vehicle loads uniformly, reduces stress concentration on soft subgrade, limits lateral sliding of foundation soil, controls uneven settlement and avoids rutting and road surface cracking.

(2) Separation

Isolates soft foundation silt, clay and upper gravel aggregate. Prevent fine soil from mixing with coarse fillers, keep the grading structure of base layer intact and stable.

(3) Filtration & Drainage

Its unique porous structure allows free passage of water while retaining soil particles. It discharges pore water inside the subgrade, eliminates water softening and mud pumping damage to road base.

(4) Anti-puncture & Protection

When paved on rock or crushed stone foundation, it buffers sharp stones to avoid damage to geomembrane or road base structure.

3. Main Raw Materials & Specifications

Raw material: Polyester filament / Polyester staple fiber

Common weight: 200g/m², 300g/m², 400g/m², 500g/m², 600g/m², 800g/m²

Key indicators: High longitudinal & transverse tensile force, large CBR burst strength, good elongation, anti-tearing, anti-aging, acid & alkali resistance

Adaptable temperature: -40℃ ~ +70℃, stable performance in cold and coastal saline areas

4. Typical Application Scenarios

Soft soil subgrade reinforcement of expressway, national highway and county road

Railway subgrade, highway widening reconstruction project

Municipal road, parking lot, container yard foundation treatment

Embankment, slope filling and river levee subgrade reinforcement

Road foundation renovation on rock, silt and swamp foundation

5. Product Advantages

Significantly reduces foundation settlement, lowers post-construction maintenance cost

Replace partial gravel filler, cut total project investment

Lightweight, flexible, easy cutting and laying, greatly shorten construction period

Resists ultraviolet aging, chemical corrosion, long service life over 20 years

Simple construction without large mechanical equipment, suitable for complex terrain

6. Construction Key Points

Clean the subgrade surface, remove sharp stones and tree roots, level the foundation.

Lay geotextile flat without tension, overlap width 10–20cm for adjacent rolls.

Fix the edge with U-shaped nails or filler compaction to prevent displacement during filling.

Backfill gravel evenly and compact layer by layer, avoid heavy machinery directly rolling the geotextile.