Page 16 - Section3.2-FiltrexxLockDownNetting

Filtrexx ® Geogrid Systems are used with Filtrexx ® Bank stabilization, Severe slope stabilization, and Vegetated retaining wall systems and are specifcally designed to increase the structural stability of the system . Geogrid materials recommended for Filtrexx ® applications shall be primarily composed of polyester and are either uniaxial or biaxial in construction. Bank stabilization applications may use biaxial geogrid, while Filtrexx ® Severe slope stabilization and Vegetated retaining wall systems may use either uniaxial or biaxial geogrids.

Geogrid is considered a structural reinforcement practice and Filtrexx ® International may be contacted for recommendations and consultation. Specifc requirements for geogrid materials are often project and application specifc, and in such case shall be determined by the Engineer. Geogrid brands may be substituted for other brands of equivalent strength and design capacity on specifc projects (see Figure 8.1). Geogrid is not to be used as a standalone practice or application for Filtrexx ® management practice installations.

Geogrid is typically specifed for two primary functions – soil stabilization and anchoring. With Filtrexx ® Severe slope stabilization or Filtrexx ® Bank stabilization, geogrid is intended as a reinforcement and/or anchoring method only. The installation and overall strength of the geogrid system results in a uniform tieback system of the FilterSoxx ™ in these applications. Geogrid does not restrict vegetation establishment and growth.

Geogrid utilized in Vegetated retaining wall

(MSE walls) applications function as a soil stabilizer. For this application, the geogrid system provides a positive friction connection between the soil and the wall system, resulting in a Mechanically Stabilized Earth system (MSE) functional in load bearing situations.

3. The connection of geogrid to the FilterSoxx ™ shall be made by completely wrapping the fascia of the FilterSoxx ™ and extending the geogrid back over stable ground at a predetermined length and distance based on project specifcations.

4. Anchoring method to the slope shall utilize a uniform lateral anchor of wire rope, galvanized pipe, or equivalent. If this method is not warranted due to specifc project conditions, other staking methods include ½ in (13mm) rebar, 2 in (50mm) x 2 in (50mm) x 36 in (900mm) hardwood stakes, or equivalent.

5. Where 2 layers of geogrid may make contact, a Bodkin type connection may be used where a schedule 40 PVC piping (or equivalent) is threaded through the two layers. This provides added connection strength between the layers of geogrid.