PRS-Neoweb™ cellular confinement can be used to reinforce embankment at the foot of soft subgrade or at the middle /top layers of the embankment itself. In any configuration, PRS-Neoweb increases strength and prevents deformation in the foundation. Typically applications include roads, rails and other construction projects with variable grades. Studies have shown that PRS-Neoweb geocells cut vertical deformation and lateral displacement by more than 50%.
Testing Strength of Rail Embankments
Tests at Columbia University described research on loading tests of model rail embankments. The tests measured the strength and deformation behavior of Neoloy based PRS-Neoweb in six different embankment configurations.
The results showed that PRS-Neoweb was very effective in increasing strength and preventing deformation in the embankment:
- PRS-Neoweb restricted vertical displacement under cyclical loading
- Little displacement occurred in the last 45,000 cycles, indicating stiffening and stabilization of the railway ballast
- PRS-Neoweb greatly restricted lateral displacement
- PRS-Neoweb was stable under controlled cyclic loading within the stress amplitude of many transportation applications (roadways, train, ballast, etc.)
The researchers concluded that “The confinement mechanism of reinforcement was very effective making the railway ballast/PRS-Neoweb composite very stiff, strong and durable…. PRS-Neoweb could be an excellent tool in roadway subgrades, railroad ballasts, and embankment construction”.
- Lower aggregate attrition – stiff and strong confinement of ballast reduces deformation.
- Reduce lateral displacement and vertical settlement by more than 50%.
- Maintain track geometry – from Neoloy high stiffness, dimensional stability and low creep under loading.
- Reduce layer thickness – reduce sub-ballast layer and use locally available soils for sub-ballast.
- More effective than geogrids – does not require high grade aggregate and has 3D zone of influence.
- Easy and fast deployment – all-weather, easy and fast installation minimizes downtime.
- Improved performance – reduce vibrations, track deflection, and smooth transitions between areas of differing subgrades.
- Improved rolling stock performance – up to 40% heavier loads and 30% faster speeds over the same track.
- Operating expenses – stabilized rails reduce vibration and, wear and tear on rolling stock (and aggregate).
- Sustainable – use of marginal infill preserves quarry resources, uses local soils, lowers hauling expenses.
- Reduce maintenance – extend maintenance surfacing cycles.
- Cost effective installation – saves construction time, equipment and aggregate.
- Low total cost of ownership – PRS-Neoweb durability that extends track maintenance periods by >3x (perpetual superstructure).