In a landfill site project in Richmond (Virginia, US), the consultant and contractor decided to use geogrids and geotextiles from TenCate Geosynthetics for reinforcing the berms and facilitating the rapid growth of vegetation on the face. This turned out to be an environmentally friendly solution in several ways.
For years, synthetically reinforced earth berms or walls have been the chosen solution for expanding landfill sites. Typically, on-site fill material has been utilised in this respect, but new technologies have now emerged that make it possible to use fly ash in the construction.
Vertical installation of TenCate Miramesh®
Burning coal in power stations generates coal combustion products such as fly ash. This material can be reused to construct a mechanically stabilized earth (MSE) berm that minimize further land disturbance. It consolidates the structure, providing better protection against weather and other conditions and, furthermore, use of this by-product leads to landfill capacity savings and a reduced CO2 footprint.
The vegetated berm
For the vertical expansion of an existing landfill site in Richmond, EnCAP-IT® decided to create (and patent) a synthetically reinforced berm using fly ash as fill material. EnCAP-IT® and Geosyntec Consultants chose TenCate Miragrid® XT and TenCate MiraMesh® GR for primary and secondary berm reinforcement and erosion protection. The deciding factors were ease of installation, favourable cost-benefit ratio (cost effectiveness) and long product service life.
Detail of the vegetated berm
TenCate MiraMesh® GR is the only erosion protection and biaxial geogrid that provides a 75 years design life in full sun exposure. Choosing these materials renders a turf reinforcement mat on the face unnecessary.