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Liner Protection with Nonwovens

When installed, a geomembrane should be protected against puncture, ultraviolet degradation, thermal and localised stress concentrations. These include indentations that lead to stress cracking. The most effective method of protecting a geomembrane has been proven to be a thick geotextile or geocomposite layer.

Protecting Basal Liners with GEOfabrics HPS Geotextiles

The function of the protective liner is to protect the liner from stresses, puncture and penetration from the overlying drainage media and waste: both short term dynamic loadings and long term static loadings. A protective material must protect the geomembrane through the permanent distribution of concentrated stresses on the geomembrane.

Geosynthetic protection layers have been in use since the late 1980s and now form the majority off liner protection methods. The driving forces behind the movement from mineral protection were lower costs due to void space savings and speed of installation, with a much lower risk of installation damage.

Once installed, a protective geotextile or goecomposite layer is placed before a stone leachate drainage blanket on the surface. It is important that the stone drainage blanket is free draining and has sufficient hydraulic conductivity to drain leachate over a large, relatively flat area. The secondary function of the drainage blanket is to provide a level of protection against the placement of the first layer of waste.

The selection of an appropriate geosynthetic protection layer is now made using the cylinder test. The cylinder test is recognised as an effective method for determining the effectiveness of a material in protecting a geomembrane against the long term effects of static point loads, it is designed to simulate as close as possible the conditions expected in the base of a landfill.

The mechanism by which geotextiles cushion point loads from individual stones is complex, with the geotextile being the top layer in a system that includes the geomembrane and mineral layer underlying the membrane. In addition, the influence of temperature and time (creep) must also be considered.

Protection efficiency can be correlated with strength and modulus, and it is a clear indication that mass does not correlate with an improvement in product performance. Specification that are based on the unit weight of a product are entirely inappropriate. When referring to geotextile protectors, the role of fibre interaction is central to performance.

Benefits

HPS Geotextiles are manufactured using a unique matrix of high tenacity, high surface friction fibres entangled such that a stone receiving a lateral load is transferred to produce an evenly distributed load to the membrane.

  • Isotropic properties: strength in all directions
  • UV stabilised – active carbon black
  • 100% virgin polymer fibres

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Design Information

Cylinder testing geomembranes and their protective materials: LFE2

HPS Geotextiles

HPS Group Datasheet 22rev01

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Landfill Basal Liner Protection for the UK

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Landfill Basal Liner Protection for Outside UK

Design Information

Landfill Liner Protection with Geotextiles

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Difficulties with Unit Weight

Published Papers

Designing with the Cylinder Test

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