Geosynthetics play a major role in extending the maintenance interval for track ballast. Depending on the nature of the subgrade, geocomposites are deployed to:
- prevent pumping of subgrade fines
- control seepage and run-off
- stabilise a subgrade to improve bearing capacity and maintain track alignment
A geogrid may be introduced as a third component of the geocomposite to stabilise a poor subgrade and improve its bearing capacity.
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| A Protexia geocomposite drain - drainage core with a robust geotextile filter on either side - replaces sand separating a ballast from a stable subgrade |
Substituting a membrane for the drainage core produces a drainage barrier for use with a water-sensitive subgrade |
| »Rail Rig |
GEOfabrics manufactures products on behalf of Aqua Geocomposites for track bed applications in the UK:
Protexia FnF016 - a filter/geonet/filter composite - is marketed by Aqua as TED2 |
