Our Geosynthetics provide solutions for permanent way applications where loss of rail track alignment caused by sub-grade erosion leads to costly maintenance and the complication caused by having to plan and temporarily close the track for its renewal.
The traditional solution has been to use a sub-ballast and/or a graded-sand layer to prevent the upward movement of fine sub-grade particles. Some 25 years ago, the use of a simple geotextile was adopted to maintain separation between the adjacent sand/ballast layers.
Since then further geosynthetics have been developed for permanent way applications and employed to deal with related issues:
geocomposite - a robust separator/filter incorporating a stiff net between two textile filter layers
a composite of geocomposite and a geogrid to provide the reinforcement function over low-load-bearing soils.
The choice of grade will depend on the sub-grade type & its strength.
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