Location: Western United States
Project Background and Challenges
A mining engineering firm needed to create a durable ramp over a liner system into a 1 million square foot evaporation pond. The pond was built at a large open-pit mineral mine in the Western United States—the ramp into the pond needed to support large loaders and dump trucks, while protecting the liner system from damage.
Building a Reinforced, Stable Ramp
The GEOWEB® 3D soil confinement system was the chosen solution. The cells were infilled with the mine’s on-site waste rock, creating a stable access ramp into the pond.
Presto’s design engineers recommended the 6-inch deep GEOWEB system anchored with three polyester tendons per panel and ATRA® Tendon Clips (load transfer devices) every fourth cell downslope. The tendons attached to a 4-inch PVC pipe, buried 2-feet below grade at the crest of the slope in the same anchor trench that secured the liner system.
The liner system consisted of, from bottom to top, a geosynthetic clay liner (GCL), a 60 mil HDPE secondary geomembrane, a 200 mil geonet, and a 60 mil textured HDPE primary geomembrane.
Approximately 75,000 sf of the GEOWEB material was installed on the 16-foot vertical, 3H:1V ramp and infilled with on-site mine waste rock without anchor penetrations through the liner system.
How Does the GEOWEB® 3D System Work?
To overcome soft subgrade challenges, access ramps built with GEOWEB® 3D geocells and aggregate infill are extremely stable and well equipped to support heavy traffic.
- Low-maintenance, 3D confined aggregate surface is highly resistant to rutting.
- Lower cost, local fill may be used
- GEOWEB panels and geotextile rolls are easy to deploy and install, even in remote or difficult to access locations
- The surface is ready for traffic immediately after infilling and compaction
Strongest, Fastest to Install Load Transfer Device
A key to installation speed is the use of the patented ATRA® Tendon Clips that lock into the GEOWEB® cell walls for the most secure connection. Due to the pull-through strength–which is 2X more than any other load transfer device–the number of ATRA Tendon Clips required per section is reduced by half, saving on time and cost of installation.