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Geotextiles

Landfill & Contaminated Land

Geofabrics' products have been designed and adapted especially for landfill applications. They are characterised by:

  • High puncture resistance at minimum cost.
  • Wide widths for minimum overlap (6m wide, 5.9m for export) saving on overlap wastage.
  • Cylinder test information for every basal liner application
Image showing landfill and contaminated land application
Image showing capping contaminated land for highway construction

Capping contaminated land for highway construction.

Image showing longitudinal band drains

Longitudinal band drains, incorporated within the geotextile, are used to collect leachate, gas, run off and seepage.

Diagram showing landfill and contaminated land applications

Basal and side-wall

Diagram showing basal and side-wall

Each grade of geotextile has been optimised to provide a particular level of puncture resistance (between 5kN to 40kN) - not weight. Weight is a convenient way of describing geotextile separators but it does not accurately reflect the puncture resistance of a geotextile protector.

In addition, longitudinal band drains are frequently incorporated within the geotextiles, at 0.5m or 1.0m centres, to provide an additional leachate drainage function (see Protexia GPT products).

Capping

Geotextiles from the lower-strength end of the range are used to protect liners from puncture by cover soils or stone drainage blankets.

High friction resistance, a characteristic of needlepunched geotextiles, is of particular benefit when used with roughened membranes on slopes.

Incorporating longitudinal band drains within the (underside) geotextile protector provides a positive drainage path to collect/convey gas and prevent uplift and loss of interface friction.

In a similar way, band drains incorporated within the (topside) geotextile protector is used to control run off and stabilise the cover soil (above the liner).

Inclined Table

image

Interface friction characteristics between soils and geosynthetics are measured using an inclined table (ISO 12957 part II). Sustained loads of up to 200kPa can be applied at angles up to 60 degrees.