Tensar^® TriAx^™ Geogrids

Weak subgrades pose the greatest challenge to the performance of an unpaved access or haul roads. Left untreated, a weak subgrade subjected to continuous heavy traffic will quickly deform, causing the road surface to rut, pothole, washboard, and ultimately deteriorate beyond use.

Tensar TriAx Geogrids are designed to reduce construction induced or in-service stresses applied to weak subgrades. They interlock with aggregate to create a stiffened platform that evenly distributes the load, increases the bearing capacity and ensuring longer-term stability and performance. The use of TriAx has also demonstrated effective separation and filtration properties, inhibiting movement and confining the subgrade when properly graded aggregate fill is utilized.

Use Tensar Geogrids for subgrade stabilization for improved site access, reduced aggregate requirements, reduced undercut, reduced maintenance, and simple installation.  Weak foundation soils (subgrades) are a common problem in road construction. Large deformation of the subgrade will lead to a rapid deterioration of the pavement surface. The interlocking action of aggregate and Tensar Geogrids results in a stiffened granular platform. This platform enhances load distribution, much like a snowshoe distributes a person’s weight evenly over soft snow. The “snowshoe effect” generated, reduces the stress applied to the subgrade.  The greater rib depth and radial stiffness of the TriAx Geogrid is even more effective in confining overlying granular fill, enhancing the “snowshoe effect” over soft subgrades by locking aggregate particles more efficiently during the compaction effort. 

As an alternative to deep over-excavation, concrete slabs, chemical stabilization/cement grouting and deep foundations, Tensar Geogrids can increase the effective bearing capacity of soil beneath shallow spread footings.  Creating a stiffened mat beneath the concrete footing reduces total and differential settlement and improves the margin of safety for unforeseen soil conditions.  Geogrids can also provide a load transfer platform when used with an intermediate foundation system, such as rammed aggregate piers, or traditional deep foundation techniques.

While conventional approaches can be expensive, labor intensive or environmentally unsound, utilizing Tensar TriAx or Tensar BX Geogrids provides an economical alternative to a potentially costly undertaking.