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WEBTEC GEOSYNTHETICS |
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TerraTex Geotextiles for Soil Stabilization |
| Terra Tex GS, HD and GS-150 are rugged woven fabrics use to stabilize very poor to moderate strength soils by separating subgrade and aggregate layers. |
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The Next Generation in Ground Stabilization Fabrics |
| The increasing use of building sites in marginal or poor soil areas and the necessity to hold the line on construction costs have led to the widespread use of ground stabilization fabrics. Contractors, engineers, and owners across the country know that fabrics save money in materials, time, and maintenance. TerraTex GS is an advanced fabric that utilizes the latest developments in polymer science, textile manufacturing technology, and quality control to offer the best value in ground stabilization fabrics. |
TerraTex GS is used in similar fashion to earlier geotextiles in that it performs the functions of separation and reinforcement |
TerraTex GS offers the advantage of savings in aggregate depth up to 40% in unpaved systems and approximately 20% in paved systems. | |
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| Separation Traffic loads (or compaction during construction) typically cause a mixing of the high cost aggregate and subgrade. This intermixing can occur in both paved and unpaved structures. As the subgrade pumps into the aggregate, the supportive strength of the aggregate is lost and rutting or pavement cracking can result. TerraTex GS with its high puncture resistance, acts as a barrier to prevent this wasteful mixing. |
Reinforcement TerraTex GS is put into tension as traffic loads are applied. The extremely high modulus (resistance to stretching) of TerraTex GS causes it to absorb those loadings and distribute them over a large area. The resulting decrease in pressure on the subgrade can result in a significant reduction in required aggregate depth. |
| TerraTex GS ground stabilization fabric is more than just another geotextile. The polymer used to make TerraTex GS is tougher and more resistant to sunlight damage than other first generation geotextiles. These features allow the installer more flexibility in handling and usage since the fabrics are less prone to damage during installation. |
| Fabric Installation Installation of TerraTex GS is straightforward as shown. The rolls are designed for ease of transporting and handling in the field. When more than one width of fabric is installed, the fabric edges must be overlapped one to three feet depending on soil conditions (different measures may be required in especially poor soils). TerraTex GS is extremely tough but is not indestructible. Operation of vehicles directly on the fabric should be avoided and on uncompacted sections should be done by experienced personnel only. |
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Minimum Average Roll Values & Description |
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TerraTex GS Metric |
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applications for construction fabric have enjoyed widespread acceptance and significant
growth in usage. This success can be attributed to the excellent use of geotextiles.
However, many of the construction fabrics used today were designed for the moderate soil
conditions found in most construction projects. TerraTex HD, on the other hand, is a high
strength, robust fabric that is engineered for stabilization applications in more severe
soil conditions. TerraTex HD goes a step beyond most fabrics by offering the engineer and
contractor:
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. |
Embankment Protection |
Stabilization of Railroad Track beds |
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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. |
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Stabilization of Very Poor Strength Soils |
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TerraTex HD performs the functions of separation and reinforcement as do other ground stabilization fabrics. However, the high tensile strength and high initial modulus of TerraTex HD allows it to be used in stabilizing much weaker strength soils or in areas where extremely heavy traffic loads are expected. It also provides that extra margin of safety for critical projects being constructed on marginal strength soils. Savings in aggregate when stabilizing with TerraTex HD is normally more than enough to pay for the fabric. In addition, future maintenance cost due to subgrade contamination of the aggregate are virtually eliminated. Fabric Installation is Straightforward.
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Minimum Average Roll Values & Description |
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TerraTex HD metric |
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repair or reconstruction of paved surfaces can quickly use up the funds in a maintenance
budget. When properly applied, TerraTex GS-150 construction fabric can help to extend the
life of these surfaces and thereby reduce maintenance expenses. TerraTex GS-150 is a
lightweight, strong and inexpensive geotextile designed for use beneath paved surfaces
such as streets, parking lots, tennis courts, and driveways. In a typical paving application, several inches of compactable
aggregate are placed directly on firm, dry subgrade. An asphalt or concrete wearing course
is then laid on top. when adequately designed for actual traffic loads, these systems
should last for quite a few years. One reason that some of these paved surfaces do not
last is the breakdown of the aggregate |
support layer. If the subgrade becomes wet, soil fines can work their way up into the aggregate layer and reduce its load bearing capacity. When this happens, the system can no longer support designed loads and is
especially vulnerable to heavy vehicles like trash collectors, delivery trucks and moving
vans. The end result is a badly cracked surface course that will require expensive
repairs. A layer of TerraTex GS-150 placed between the subsoil and the aggregate layer
will all but eliminate the movement of soil fines into the aggregate base. In addition,
the fabric provides a high friction surface between the subgrade and the aggregate layer
which helps to keep the aggregate from "spreading". |
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| Also, because of its high modulus (resistance to stretching) TerraTex GS-150 will tend to bridge across soft areas in the subgrade. This will | reduce the potential for localized shear failure that can lead to cracks and pot holes in the wearing surface. | |
Other Applications Include |
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Minimum Average Roll Values & Description |
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Phone: +1.800.438.0027 Fax: +1.704.394.7946 6509-C Northpark Blvd. Charlotte, NC 28216 e-mail: info@webtecgeos.com |
