TerraTex HD
TerraTex HD can be used in most stabilization applications, however, it was designed for and is most effectively applied in the stabilization of very poor strength soils, railroad track beds, and embankment protection under armor stone.
The movement of water in a stream, lake, river or channel can cause severe embankment deterioration. An established practice to deter this erosion has been to protect embankments with armor stone placed directly on the embankment or on a graded filter system. But, these methods are subject to scouring by water movement which can cause complete collapse of the protective armor system.
TerraTex HD is used as a filter beneath armor stone to protect the embankment against erosion. Unlike graded filter systems, TerraTex HD will not scour out. Its high strength and porosity make it suitable for use on all but the most porous soils while being a most economical filter system. TerraTex HD is recommended for use beneath rip-rap, gabion baskets, interlocking concrete blocks and behind sea walls.
A major concern and cost for railroad companies and spur line owners is the replacement of fouled ballast. As trains pass over the rails, the up and down motion of the ties pump subgrade fines into the ballast. This contaminated ballast cannot support design loads. TerraTex HD acts as a separator between the ballast or sub-ballast and subgrade fines while reducing the pressure on the subgrade. As the ties move, water can be pumped up through the fabric and out through the ballast, but soil particles are kept in place. Also, TerraTex HD helps confine the ballast against lateral movement which, thereby, maintains its density and load bearing characteristics.
TerraTex HD can be installed in new construction or during track bed rehabilitation. The roll thickness and weight allows for fabric placement by hand or with most automated rail maintenance equipment. The rail sections can be put directly on the fabric and the ballast placed afterwards using conventional methods.
Webtec, Inc., 2619 West Blvd., P.O. Box 240302, Charlotte, NC 28224. Tel: 704-398-0954; Fax: 704-394-7946.