What are ‘GeoJute’ and ‘GeoGrids’? How does IR prevent soil erosion in the areas where track is laid?

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What are ‘GeoJute’ and ‘GeoGrids’? How does IR prevent soil erosion in the areas where track is laid?

July 19, 2019, 12:01 PM

Erosion of the soil around a track formation can be quite dangerous as the track may subside or warp and move. In many cases IR simply encourages the local shrubby vegetation to grow in the areas near the track to stem the erosion. Where severe erosion is a problem, ‘GeoJute’ has been used. This is an ecologically safe material made of jute yarn with a coarse open mesh structure. This is placed on the affected portions of the embankment or cutting after removing clods, large stones, etc., and appropriate scrubby vegetation is seeded in the area. The jute yarn is biodegradable and disappears after a while, but by that time the vegetation has had a chance to take root and grow firmly in the protected soil.

In rare cases where vegetative root growth is thought to be insufficient to stem the erosion of the soil, a synthetic root matrix reinforcement system may be used. Known as ‘GeoGrids’, these flexible, synthetic meshes of simply extruded, unoriented and unstretched polymer materials are placed in the top layer of the soil to provide erosion resistance both by its own presence and by strengthening the root matrix of the local vegetation.

These GeoGrid polymers are non-biodegradable, and quite stable, resisting ultraviolet exposure and tolerant of very high and low temperatures. Boulder retention in some places is augmented by the deployment of bi-axially oriented GeoGrid meshes to anchor medium to large boulders. In a few cases, IR has also resorted to ‘hydroseeding’, involving the sprinkling of seeds of fast-growing grasses and scrub vegetation with specially formulated mulch and fertilizer mixtures.

Source – IFRCA.org

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