Embankment Drainage, Consolidation & Settlement Control
ABG’s expertise in designing geosynthetics for major civil engineering and road projects, has seen the development of a range of geocomposites that are used in place of traditional drainage stone to provide a significant reduction in the environmental impact, costs and installation times on highway projects.
Fildrain 7DD and Fildrain 7DHD geocomposite drainage layers are the most advanced system for relieving pore pressure in the construction of new highway embankments. This proven method of construction has BBA certification for the starter layer and subsequent layers through the height of the embankment to aid consolidation without expensive aggregate.
Full settlement of new highway embankments must be achieved before the road surface is constructed. Embankment fill is placed at optimum moisture content for compaction. This invariably means that the compacted fill, as a result of pore pressure, is too wet to support long term loads without settlement. Relief of pore pressure and speeding consolidation is critical to deliver projects on time and within budget.
Fildrain geocomposites are used to create horizontal drainage layers at typically one metre vertical spacing for quick reduction of pore pressure. Compared to crushed stone, it is cost effective to install Fildrain at close spacing. Fildrain is also impermeable in the vertical plane which means that each layer of Fildrain protects the earthworks from the ingress of rainfall.
Projects have been fully consolidated in 25% of the time normally expected using traditional methods. Fildrain geocomposite even enables the use of otherwise unsuitable over wet material. This allows greater use of site-won fill which minimises earthworks movements.
Embankment Erosion Control
Erosion control mats are are designed to provide surface protection from the damaging effects of wind and rain. The installation of an ABG erosion control mat enhances the structural stability of newly cut slopes in highway applications.
Erosamat Type 1, Erosamat Type 2 and Erosamat Type 4 are biodegradable coir / jute erosion control geosynthetics ideal for promoting vetation growth on new embankments. Erosamat Type 3 erosion control mat is a closely packed matrix of polypropylene fibres thermally bonded together to create a tough and flexible, long lasting erosion control mat. It is suitable for all situations where permanent erosion control is required. As a system it provides the root reinforcement necessary for natural vegetation to resist the extreme effects of wind, rain and high water velocity.
Managing erosion on highway embankments and rock face protection is essential when the consequences of failure impact on the safe operation of infrastructure.
Installing an effective erosion control system provides immediate protection to the rock face and underlying soils whilst allowing long-term protection through healthy vegetation development.
The Erosamesh system from ABG combines the proven erosion protection performance of Erosamat Type 3 with the durability of a woven hexagonal steel mesh. Wire mesh has a proven track record in slope stabilisation applications where it is used to prevent rock sliding and progressive stalling.
The ABG Erosamesh system is suitable for steep road cuttings and slopes. The Erosamesh system provides immediate protection against erosion occurring in high risk applications, spreading loads between soil nail heads and the stabilised slope surface.
Geocells can be used to provide effective highway slope reinforcement. Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including the retention of soils on steep highway slopes.
The permeable honeycomb structure of the Erosaweb geocell system has been developed for topsoil/stone retention on steep road embankment slopes. Once installed the geocellular structure forms a blanket of shallow pockets across the slope face into which fill is placed, protecting the slope and fill from erosion forces whilst allowing vegetation to establish for long-term protection.
Slope Stabilisation & Reinforced Earthworks
Trigrid, Abgrid geogrids and ABG Enkagrid Pro geogrids can be used in a variety of steep-faced earthworks, highway embankments and to provide veneer slope stabilisation. Geogrids can be also be used with a variety of finishes (gabions, hard facing and vegetated surface) to meet aesthetic requirements.
Webwall® Geocell is a vegetated retaining wall system for steep-faced walls from 0.5m to 25m. Webwall® Geocell uses site won fill and therefore is quicker and more cost effective than gabions, sheet piles, crib walls, precast or cast in-situ concrete.
Webwall® utilises geocellular technology to produce panels that are supplied flat for ease of handling and then expanded on site to create almost vertical vegetated walls. The front of each panel is coloured green to minimise the visual impact of the wall until vegetation has established. Ideal solution for road-side embankments where a natural growing, but stabilised retaining wall is required.
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