Embankment Drainage

High Speed Rail, Pozidrain, Sevilla - Cádiz, Spain

Project Information

Client:Administrador de Infraestructuras Ferroviarias (ADIF)
Contractor:Acciona Infraestructuras
Consultant:Administrador de Infraestructuras Ferroviarias (ADIF)
Product:Pozidrain 4SK500/NW8
Quantity45,000m2
Benefits:- Rapid installation over a large area
- Significant material and labour cost savings vs granular materials
- Carbon emission reductions


Project Description

The Alto Velocidad Española (AVE) is Europe’s largest high speed rail network. The ambitious construction project was undertaken to improve connections between all of Spain’s major cities, reducing commute time and contributing to socio-economic regeneration. The new Sevilla to Cádiz railway line would be an extension of the Madrid to Sevilla route, connecting Cádiz to Jerez Airport and crossing areas of outstanding natural beauty.

The Challenge

The new route would traverse an area of Bahia del Sur (Cádiz) where an embankment would be constructed to accommodate the railway line. Ground investigations identified soft, wet soils which would be unsuitable for construction without remediation to improve stability. This would traditionally be addressed through a combination of vertical wick drains and a granular drainage blanket to direct the water horizontally to French drains adjacent to the embankment. However, this method required the use of large quantities of costly imported granular material, which would also prove slow to install. These considerations led the designer to consider the use of a drainage geocomposite to act as a horizontal drainage blanket, a methodology which had proved successful in other infrastructure works on soft ground.

The Solution

The contractor Terratest approached ABG to assist in the redesign utilising Pozidrain drainage geocomposite. Pozidrain comprises a high-strength drainage core thermally bonded to a filtration geotextile. Using Darcy’s Law allowed ABG to calculate the equivalent in-plane flow of the granular material, and propose a grade of Pozidrain geocomposite suitable to manage the expected water flows. In-plane flow tests to EN ISO 12958 using soft foam platens to simulate soil overburden proved the required flow capacity. Design calculations, which accounted for the weight of the embankment and the traffic loads, indicated a long term pressure at the base of the embankment in excess of 55 kPa. Pozidrain 4SK500/NW8 was chosen to provide a 9.0 factor of safety. Pozidrain drainage geocomposite was installed by the contractor in a fraction of the time required for the original granular design, meeting tight project timescales and providing a significant cost saving.

Brownfield Drainage and Landfill Capping with ABG Pozidrain geocomposite

ABG Pozidrain

The ABG Service

ABG worked closely with Terratest to provide full design support, comparisons, costing and supply.

Contact ABG today to discuss your rail or embankment drainage project specific requirements and discover how ABG past experience and innovative products can help on your project.

Pozidrain drainage geosynthetic installedWide width rolls allowed rapid installation to meet challenging project timescales
ABG Pozidrain drainage geocomposite installation
Embankment drainage diagramCross-sectional drawings show the designed build up and the water flow at the shallow gradient
Embankment fill being installed on Pozidrain drainage geocompositeEmbankment fill being installed on Pozidrain
Pozidrain drainage geocomposite


Pozidrain

Pozidrain drainage geocomposite is a wide-width preformed drainage and gas venting solution, providing a sustainable, environmental alternative to traditional filter stone drainage layers. Used extensively for landfill and contaminated land drainage on slopes and basal areas to remove water, liquids and gas quickly & efficiently.

more...

Pozidrain Drainage geocomposite for landfill drainage and capping from ABG Geosynthetics
 

Products

Pozidrain

Pozidrain drainage geocomposite is a wide-width preformed drainage and gas venting solution, providing a sustainable, environmental alternative to traditional filter stone drainage layers. Used extensively for landfill and contaminated land drainage on slopes and basal areas to remove water, liquids and gas quickly & efficiently.

more...

Pozidrain Drainage geocomposite for landfill drainage and capping from ABG Geosynthetics
 

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