Unsupported browser

For a better experience, please update your browser to its latest version.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Technical paper: Geosynthetic protection layers for the lining systems of landfills

by John H Dixon, Netlon and Kent von Maubeugez, Naue-Fasertechnik.

This paper was first published in the GE’s December 1992 issue.


A common requirement for the base and side seals of new landfills is now a composite lining consisting of a low permeability, chemically inert geomembrane directly overlying a low permeability clay layer (Council Directive 1991).These two components are complementary; the geomembrane being chemically resistant to test liquids and leachates and the clay layer able to absorb chlorinated hydrocarbons which could migrate through the geomembrane.

German landfill design has influenced the European approach. The German minimum requirements for domestic landfill wastes are recorded in LAGA-Merkblatt (1990) and TA-Siedlungsfall (1991).

A composite lining is required in Germany including a high density polyethylene geomembrane and in addition the leachate head on the lining must be controlled by a drainage layer. This layer consists of a continuous blanket of granular inaterial with an interconnected pipe collection system. To minimise biochemical clogging, this granular material must be coarse (16mm-32mm particle size) and (10% calcium carbonate by weight. A protection layer is essential between this coarse drainage layer and the geomembrane to avoid mechanical damage to the liner. Sand protection layers are considered undesirable (von Maubeuge 5 Dixon 1992)and geosynthetic protection layers are favoured.

The general German philosophy on protection layers is that they must withstand all chemical, biological and mechanical stresses and last ‘a day longer’han the geomembrane —the geomembrane can only be as good as the protection layer allows. For this reason the protection layer is also manufactured from HDPE. 

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.