Rail embankment construction projects benefit from the installation of geosynthetics for slope stabilisation, embankment erosion control, earthworks drainage, consolidation and settlement control.
ABG are a market leader in the development, manufacture and technical support of high performance geosynthetics for transport embankment engineering projects.
ABG’s expertise in designing geosynthetics for rail civil engineering 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 transport projects.
Fildrain 7DD and Fildrain 7DHD geocomposite drainage layers are the most advanced system for relieving pore pressure in the construction of new rail 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 rail embankments must be achieved before the trackbed is constructed and embankment fill is placed at the 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 speed of consolidation is therefore 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 spacings. Fildrain is also impermeable in the vertical plane which means that each layer protects the earthworks from the ingress of rainfall.
Projects have been fully consolidated in 25% of the time normally expected compared to traditional methods. Fildrain geocomposite even enables the use of wet material that would otherwise be unsuitable for embankment construction. This allows greater use of site-won fill which minimises earthworks movements.
To estimate the embankment fill consolidation time when using a drainage geocomposite, visit the ABG Design Solutions site (www.abg-designsolutions.com).
Erosion control mats 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 rail applications.
Erosamat Type 1, Erosamat Type 2 and Erosamat Type 4 are biodegradable coir / jute erosion control geosynthetics ideal for promoting vegetation 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.
Geocells can be used to provide effective railway slope reinforcement. Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including the retention of soils on steep 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.
Abgrid geogrids can be used in a variety of steep-faced earthworks and rail embankments 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. 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. It is the ideal solution for embankments where a natural growing, but stabilised retaining wall is required.
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